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Exactly why is it better to shut your car off when getting gas??

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Old 10-20-2000, 12:14 AM
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Exactly why is it better to shut your car off when getting gas??

I know the obvious reasons, is it any better for the engine or anything?? Thanks!!

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Old 10-20-2000, 12:33 AM
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well, to start with it's illegal in all 50 states (federal law) to gas up while it's running. other reasons are obvious. no need to go into them. not very technical.
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Old 10-20-2000, 12:39 AM
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Ok, so there isn't a Tech reason for it. Thats what I thought. I know the obvious reasons!! Some1 asked me if it is better for the engine.

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Old 10-20-2000, 04:28 AM
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Are you serious? With your engine running there are sparks (i.e. spark plugs) and gas is highly flamable. If there was one spark to hit the wrong place.... BOOM!!!

haha.... I had to have fun with that!

Oh yea... and check this out... NICE BURNOUT.... my car... http://www.eden.rutgers.edu/~shotliff/video.htm

Its best to rick click on the link on the bottom and click save target as or save link as, then watch it off your computer.

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Old 10-20-2000, 04:44 AM
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So i am getting fuel one day, Being lazy I decide to leave the car running, you know, just in case i rob the place while i am there. i am filling her up when i realize that i haven't changed those plug wires in quite a long time, oh well i think next weekend. just as i am putting my nozzle back into the pump, wouldn't you know it, i blew the place all to hell, couple of other poeple two, crater 15 feet deep, you know how it goes eh!!!. Hope i am not insulting anyone, just being creative with my reply

it is just safer to shut down my good man.
trust us on this one

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Old 10-20-2000, 07:27 AM
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Cougar,

I hope you were filling up a Honda when that happened. We wouldn't want to damage any of our good cars in incidents like that.

- - - - - - - - - - - - - - - - - - - - - - - -

IROC,

Other than the obvious, there is a reason. Newer cars (OBDII) will pressure check the tank while in operation to affirm that the system is sealed. Maintaining a sealed fuel system is necessary to prevent evaporated fuel from venting to atmosphere. This is a significant part of vehicle emissions, and failure of the seal while the car is running can set a DTC. When I first got my '96, I filled the tank while idling at the pump (Doh!) and aet an error code. After calling the dealer service department, the tech asked immediately if I filled up while running or didn't get the fuel cap tight after filling. He knew right away what had happened, since it was a very common problem.

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Old 10-20-2000, 08:43 AM
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Myself, i've always been a proponent of leaving my cars running while fueling, especially if a long highway style trip is involved.
I hear what you are saying about saftey, but riddle me this joker. Most of us keep our cars in good tune. No backfiring. No ancient plug wires, etc. That shoots the theory of leaving our cars running down to a freak act of god type thing.
HOWEVER. Say you're at the pump and joe digga pulls up across from you in his 1981 honda accord with a busted 3rd gear. Boom...
The theory of turning your car off at the pump is just stupid. It would be true if you couldn't drive up to the pumps, like if they were housed in a car wash style encolsure that pulled your car in and fueled it, then pulled you out before you fired it up. But the fact that any number of ****ty old cars that are gonna backfire and leak plug energy are driving around you whenever you pump is vastly more dangerous then standing at the rear of your fine running vehicle and pumping. Another interesting ay to look at this is when is your car more likely to have a miss/backfire/afterfire. When it's running at a smooth idle or while cranking. And speaking of cranking. I GUARANTEE that when you turn the key your solenoid and starter are leaking more sparks then any properly firing plug/wire ever will. And since the starter is lower then the plugs, and gas fumes are heavier than air, do you really want to be producing a big spark as the solenoid engages at near ground level.
Now let's look at why you wouldn't want to turn your car off. Real simple...i like my gaskets and hoses enough to not want to come straight off a high speed highway run and immediately shut down. Letting all that hot coolant just sit there and boil over. Warping surfaces and stressing everything. Not to mention that the hot oil will all run straight off everything it's supposed to be protecting being so hot, leading to increased friction/wear on start-up among other things. Now you're asking yourself isn't that the same thing as when you get where you're going. Not for me. Whenever i've been driving at high speeds i always let my car idle for a little bit to make sure that the cooling system is stabilized and to give everything a chance to cool down under control.
The federal law that you are referring to was passed in an era when miss/afterfires were very common. Engine managhement was non-existent and carbs/ignitions were rough. Therefore, it was a good idea to have cars running as little as possible when pumping, cuz chances are it would end up afterfiring through the exhaust as you pumped. But thats far from the norm today, and any of you who care about your car and allow it to run so miserably are idiots.
...ed
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Old 10-20-2000, 11:13 AM
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Have to disagree with...
i like my gaskets and hoses enough to not want to come straight off a high speed highway run and immediately shut down.
How often do you refuel? Probably every 200-300 miles. How often do you shut your car off when you: get to work, home, the store, church, etc. At least daily, if not more often, right? This works out to a lot more often than refueling. Also, most cars run much cooler coming off the highway than putzing around at stop-and-go city speeds.

I think the hoses and other equip't can handle the abuse from the occasional refueling stop. LOL!

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Old 10-20-2000, 11:49 AM
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What part of high speed highway driving didn't you understand LL? If you think running an engine hard for an extended period of time and then immediately shutting down doesn't subject your engine to incredible heat soak related stress, then you are a schmuck. Not trying to flame you, but thats just an idiotic statement. Of course an average leisurely commute isn't going to hurt it to shut down, but having witnessed plenty of boil-overs from hasty shut down after hard running, i believe in letting things settle down first. The same thing applies to putzing around in city traffic as well. If my engine is running hot or hard i will let it idle to chill out.
Do you even understand what is going on inside an engine. Just because your coolant temperature stays cool on the highway doesn't mean that a huge amount of heat transfer is going on. Everything stays cool b/c the cooling system is also very efficient at those speeds as well. However, if you shut it off after hard running, all that extra heat now has nowhere to go but to boil over and warp/stress parts. I don't know what part of the country you live in, but next time it's pretty hot by you, do this little experiment. Go drive down the highway at at least a couple thousand rpms. Or go sit in traffic. Now shut your car off. Now come back 5 minutes later and turn your key on. Wow, your coolant temp is now probbaly showing 40+ degrees hotter then when it was shut down. That IS BAD.
Personally, i like my cars to run pretty cool. I changed a couple of head gaskets, and don't think it's much fun. Therefore, anything i can do to save my engine from seeing boiling temperatures in the heads i will do. Shutting dowm when hot WILL cause this to happen. As the owner of an aluminum headed ZZ4 i'd think you'd be pretty concerned about it too LL.
...ed
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Old 10-20-2000, 12:31 PM
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I remember my college professor [Dr.James Fenton, Univ. of CT] addressing this refueling subject in an 'Electrochemical Engineering' course I had taken years ago.

During the actual process of refueling, a positive electrical charge accumulates in the fuel, where the incoming gas stream enters the existing gas within the tank. If the gas nozzle is not touching the filler neck (or grounded to the tank), a voltage potential is created that may lead to potential explosion.

To prevent this from potential from happening,all one has to do is ensure
the nozzle is touching the filler neck, or
just interrupt the incoming gas flow for a second, then continue pumping. That will allow the positive charge to dissipate, and
eliminate any voltage potential.

Contrary to popular belief, all the laws in place are based on this premise, not the obvious mentioned in previous replies.

BTW, in my area, it's a $50 fine for leaving
your car running while refueling.
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Old 10-20-2000, 02:06 PM
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I understand highway driving and thirdgens a lot more than you think. I've got nearly 200k miles in just two, an 84 H.O. and my current 90 IROC. I bought both new, and drove them on the unlimited Autobahns of Germany for a combined distance of 100k+ miles. So trust me, I understand hard driving.

Back to the issue...you never specified HARD in your original point...
if a long highway style trip is involved.
That in itself, doesn't constitute hard. Most people I know actually drive a bit easier for long trips so they can economize on gas mileage and not have to stop as often, which tends to kill your average speed.

If you are speaking of a cranky, hot-running, barely streetable car, then you might need to do what the big boys do, and do a cool-off lap, or leave it idling like you suggested.

IMO you still didn't address the issue of the multiple heat abuses you subject a car to everytime you bring it up to full operating temp, and then just shut it off. That abuse is done to the car potentially several times a day, 365 days a year.

BTW, I'm also quite aware of the problems with a heat-soaked engine and things busting, but I'm fairly certain that most cars on this board are just shut off when the owner reaches his/her destination, because they are driving a STREET CAR, not something that should be on a Grand National or Cup Track.

So in closing Ed, I do believe you are a pompous dipstick.

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[This message has been edited by Lounge Lizard 6 (edited October 20, 2000).]
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Old 10-20-2000, 02:58 PM
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How about the fact that the fuel system is "pressurized" and most modern OBD systems will throw a code due to no pressure. This is why some fuel caps say "Rotate until 3 clicks" or something on that line. This is to make sure the cap is not loose. I have talked to a few people that had a code thrown only to have the dealer find the cap not tightened down.

Just my .02 worth. L8R

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Old 10-20-2000, 03:00 PM
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Sorry Ed but I have to agree with LL. I always run 20-30 cooler in my Grand Am on the highway than around town. When I get off the highway and refuel immediatly and restart the car it isnt much over the operating temp. Driving around town lesurely(sp?) I always run hot and my car has NO grille in the front. Sorry EHHHH wrong. Number 2 heating a metal to a temperature and then letting it cool is how you RELEIVE stress. As far as the oil running off the hot parts I have to agree with you. But unless you have electric fans and water pump you arent really going to cool anything off by letting the engine run.

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Old 10-20-2000, 03:19 PM
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Old 10-20-2000, 04:46 PM
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FYI, the same reason why you are not to smoke while refueling. Also recently here in CA they are plastering stickers on the gas pumps warning to turn OFF the cell phones when refueling. Last, do you know NOT to fill a gas can while it is still in the bed of your truck? Instead put it on the ground to refuel it. Same reason, static electricity buildup that can ignite the vapors. Oh, I suppose if you want to take the risk you could leave your car on, while smoking, talking on the cell phone and refilling the gas cans on the tailgate. Just wear a fireproof suit while doing it! LOL 8^)

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Old 10-20-2000, 05:09 PM
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maybe somone drove off with the nozzel still in the tank and took off. whoosh. fire ball.
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Old 10-20-2000, 05:09 PM
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Old 10-20-2000, 05:19 PM
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Lonsal brings up a good point about static electricity. It's more of a safety issue than anything else. The vapors are more dangerous...all it takes is static electricity at the right time, but I figure this rarely happens at all...When was the last time you heard of a gas station blowing up? LOL

When I refuel helicopters at work, we are required to ground the aircraft, ground the fuel truck, then ground the fuel truck to the aircraft...in that order. Plus no static or spark producing items in the refuel area such as radios, lighters, etc. And then we have to periodically ground ourselves during the refuel...What a pain in the *** if we had to do all that everytime we fill up our cars...

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Old 10-20-2000, 06:21 PM
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letting your car sit and idle after a hard run for extended periods of time is just as bad as shutting it off. alot of heat builds up with it idling since less to no air is coming through the radiator now. i can't believe someone actually used that. my 91 s10 has the original hoses on it with over 200k and gets shut off everytime i get gas. as for the gaskets, what's leaking is only common stuff that has worn out. unless your running a turbo car a major idle isnt' neccesary since most gas stations are a couple of minute slower speed drives away froma a highway. well enough to allow your engine to "calm down".
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Old 10-21-2000, 03:49 AM
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I am a pizza delivery driver and since I use my 500cube Grand Prix to deliver in I make frequent gas stops and I am ALWAYS in a hurry since time is money on the job, so I always get a couple bucks gas with the engine running using a debit card so I can get in and out of the station in about 2 minutes. Yes, I'm in that big a hurry while delivering, and yes I do many many burnouts in that car delivering Hah I don't give a sheet what ya think, I get tires for $20 each from my "connection" at the tire place.
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Old 10-21-2000, 04:06 AM
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I started leaving my car on while I fuel up it. For some stupid reason I only trip the VATS system at the pump and well sitting there for 5 minutes makes you look like an @ss.

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Old 10-23-2000, 09:48 AM
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I can not be static electricty why. Think about the military and infight refueling. I think there would be a big problem if they turn their engines off while refueling. Air is full of static electricty how you think lighting cloud to cloud occurs? Also ships and tanks are refuled powered up. Or is it that the government can not trust us to do two things at once? Maybe I am wrong and someone thought that it was water instead of gas and tried to wash the car down.

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Old 10-23-2000, 03:29 PM
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to answer the guys question.I dont think the actual process of the fuel going in while the car is running will hurt anything.I think he said he knew the safety reasons not to.do all you people leave your car running when you go in somewhere to eat,at the store,church,and everywhere you stop for a couple minutes,please.you get gas less often then stopping for other things.

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Old 10-23-2000, 04:09 PM
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alot of heat builds up with it idling since less to no air is coming through the radiator now
My car has a fan behind the radiator. Anybody else?

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Old 10-23-2000, 04:22 PM
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wow we got a lot of miscommunicated thoughts goin on here.. smoking while fueling being a biggie, granted you can drop a lit match into a bucket of gas and it will just put the match out (ive dont it before), as the liquid form of the gas isnt very flamable, but the vapors from it are, flamable to the point where a hot enough spark from a ciggarage being droped or ashed could potentially ignite a fireball.. as far as static, that is bogus, how would you explain gas tanks with non- grounding filler necks work? or composite tanks in newer vehicles.. plus, we all know how small most static shocks are, how short a distance they will travel.. now think about how many volts it takes to ignite a spark plug, that short little distance.. sure its under pressure, but i couldnt see any static shock large enough to start a fire could be generated.. if theis were true, it should be illegal to fuel your car if your wearing a wool sweater...
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Old 10-23-2000, 09:01 PM
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Besides all the safety reasons... there is another reason for requesting people to turn off there motors before refueling: "Fill and Fly".
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Old 10-23-2000, 09:08 PM
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Just like all goofy laws, If was probaly some dude for bumfu@#, Maine dropped the pump on his hanging exhaust.

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Old 10-24-2000, 01:07 AM
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WHY WOULD YOU WANT IT RUNNING? THINK ABOUT THIS. YOU ARE GETTING GAS, BUT WASTING IT THE SAME TIME FOR 10 MIN WHILE YOU FILL UP AND GO PAY. C'MON HERE.
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Old 10-24-2000, 11:47 AM
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Yeah, i am a pompous **** sometimes, so what? My main point was that pumping gas while running is not any more unsafe than driving up, pumping it while people drive around you, and then restarting, and IMHO is actually marginally safer due to the lack of a restart (assuming a good running car.)
I also made the point that i do not like to subject my engine to excessive heat soak by shutting it off when it is running hot. Hell, it doesn't even have to be running hot. I never ran hot on the highway, but if i were to pull off and shut down, then restart a couple minutes later i would see a huge spike in my coolant temperatures. If i'm running hot to begin with it would only be worse. THIS is what i am avoiding.
If i'm a pompous *** b/c i treat my car well then so be it. It's my nickel worth of fuel and i'll waste it if i want while i fill up. Maybe it is going to save me a head job, maybe it won't, but i'll err on the side of caution when it's this easy. Only a schmuck could argue that.
...ed
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Old 10-24-2000, 02:03 PM
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Static is a MAJOR issue while filling. As said in another post the car SHOULD be grounded. Most ignition systems run around 40,000 volts or so. Well just walking around the house in your socks on carpet your body can build up a charge as much as 50,000 volts. And static charges can jump up to 3 feet whithout you ever seeing a spark. I have gone up to my car lots of times and tuched the handle and gotten a nice shock (do it again please). Granted it doesnt happen very much but it could and I dont want to be the next car over when it does. So for everyones sake (Government, local government, Pedestrians and others) please just FREAKIN TURN YOUR CAR OFF WHEN YOU PUMP! I DONT WANT TO DIE BECAUSE OF YOUR STUPIDITY!

Thank you
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Old 10-24-2000, 02:11 PM
  #31  
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You are right on that one scooter
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Old 10-24-2000, 03:54 PM
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A couple of things to clarify. I mentioned static electricity in regards to refilling your gas cans while they are on the tailgate of a pickup. The reason why this is dangerous is due to the static buildup that occurs with a plastic bed liner. The static charge will be relieved when the hose of the gas pump grounds the gas can. Instead you are to put the gas can onto the ground so it is already grounded. OK, back to refueling a car: FYI, I heard on Car Talk that the tire companies are putting less carbon black into the tires than they have in the past. This is causing more car owners to complain of being bit by static electricity when they touch the door handle to get out of the car. The static charge isn't being grounded by the tires as well as it had previously because of the reduced carbon black. Their only recommendation was to touch the door with the key first or hand a grounding strap from the car. I don't know how much of a problem static electricity is when refueling, but it is more of a problem than in the past. Back to the original question: "Exactly why is it better to shut your car off when getting gas?" If for no other reason than to play it safe and remove it as another source of ignition, makes enough sense for me.

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Old 10-24-2000, 04:34 PM
  #33  
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tires? carbon black? im not even going there... as far as wasting gas while pumping, your actually saving gas, it takes more fuel to restart your engine that it takes to idle for the few minutes it takes to refuel.. see that man thats smoking while hes pumping his gas? that was me before i quit smoking.. when your careful theres nothin to worry about, as said before, you could be 100% safe, and oyu still run the risk of injury if some idiot in a clunker dragging his muffler creating sparks pulls in next to you, turns off his hoopty and BAM, that puddle of gas spillage on the other side of the pump is a giant fireball...
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Old 10-24-2000, 05:35 PM
  #34  
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Accualy this is going to sound crazy, but in most states it's illegal to leave the car running when no ones in the drivers seat. To me this is probaly more of case then the fire issue.
This was one the original ten or so FAR's in flying. Never leave the plane running, with no one in it.

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Old 01-07-2001, 11:19 PM
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I was up at the 2000 Seattle NHRA Northwest Nationals. While an NHRA guy was testing a top fueler's nitro methayne fuel for the 90% rule, there was a guy right behind him smoking a cigarette. At that point I decided to vacate from that location. This has nothing to do with the question at hand, but more to the stupidity of people, and combustable fuels. The fact of the matter is, THE WORLD IS FULL OF STUPID PEOPLE! That's why we have laws.
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Old 01-08-2001, 12:27 AM
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I have always been afraid that a burning piece of my catalytic converter will fall into one of the test holes in a gas well... I am actually suprised that gas stations don't blow up more often..
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Old 01-08-2001, 12:59 PM
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Static electricity is the big reason for shutting off a car. All airplanes build up tremendous amounts of static electricity while flying, and especially on landing (tires go like 0-100 in less than a second). All airplanes are also grounded to safeguard against static release. Imagine the gas nozzle hitting the tank and a spark sets of the 1,000 gallons of JET A fuel in the plane and the additional 2500 gallons of fuel in the gas truck. That's why u turn the car off as well. Cars have a constant ground (they don't, um, shouldnt be capable of flight). So the tires are alway grounding the cars out. oh yeah, a static shock sure can start a fire, check out the the NTSB safety files online and you will see several RECORDED incidents of this happening, creates a tremendous mess.

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[This message has been edited by 84TransAm (edited January 08, 2001).]
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Old 01-08-2001, 02:08 PM
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Originally posted by IROCZZ3:
Lonsal brings up a good point about static electricity. It's more of a safety issue than anything else. The vapors are more dangerous...all it takes is static electricity at the right time, but I figure this rarely happens at all...When was the last time you heard of a gas station blowing up? LOL


Actually, It happened here not even a couple months ago. Some fool was refilling some fuel tanks in the bed of his truck and BOOM The place went up in flames, static electricity the cause.

Quote:
"I can not be static electricty why. Think about the military and infight refueling. I think there would be a big
problem if they turn their engines off while refueling. Air is full of static electricty how you think lighting cloud to
cloud occurs? Also ships and tanks are refuled powered up. Or is it that the government can not trust us to do
two things at once? Maybe I am wrong and someone thought that it was water instead of gas and tried to wash
the car down."


im no aeronautical engineer but as far as i know, airplanes arent grounded while in flight so that sort of thing cant happen unless a lightning bolt strikes the plane and hits ground at the same time I guess
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Old 01-08-2001, 02:26 PM
  #39  
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Heh this post is amusing, how many people have posted to it!

I myself shut down my car. and lock the doors. might sound a bit paranoid, but i have heard (true or now) how people never leave ther car doors locked at the gas station, and while you run and pay, someone can just walk up and take whatever they want out of the car, or even drive away if like most people, you leave the keys in the car.

food for thought. i know where i would hit first if i was a car theif. hmm.. now that i think about it, i could make some good $$s with that idea... hehe shh!

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Old 01-08-2001, 02:28 PM
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ive seen that too i knew a guy that had a habit of leaving his car on and paying next thing he knows he turns around and his car is gone
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Old 01-08-2001, 10:23 PM
  #41  
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Actually, isn't static electricity only a problem when it comes in contact with a ground? Something like the Hindenburg (if you don't buy the bomb theory planted by the *****).

But in the case of having to turn off your engine and the government protecting fools; the last time I was in Oregon, I was prohibited from even fillinig my own gas tank. I guess too many fools overfilled their gas tanks or took off without removing the gas nozzle.
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Old 01-08-2001, 11:30 PM
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Well.. static electricity is only going to spark if it has some place to go. You can build up all the charge you want by flying around in a plane and be perfectly safe with the fuel onboard because that static charge isn't going ot have anywhere to go and therefor never make a spark. (Unless your plane creates a lightning bolt.. lol)

Likewise.. if another plane is flying around in the air too chances are it's going to have the same charge as your plane is, so there wouldn't be a transfer of electricity (still no place for it to go.)

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Old 01-09-2001, 11:02 AM
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For years I have left my car safely running while I fill up! What's the big deal? Static electricity will do it's damage wether the engine is running or not. This kinda falls in the dumb category like the banning of cell-phones at gas stations. DUH!

I've gotten so used to leaving the car running that recently when I was in Wisconsin filling up, some lady came running out "sir, you have to turn your car off now!". I'm like, "what's the deal?". She was all scared looking like I was planning to blow the place up! What a bunch of Ninnys!!

I might have a different outlook on this subject because I used to have to "hot-fuel" military helicopters from the flight deck of a navy ship at sea as they were hovering 30ft. overhead! Talk about a fun thing to do while the ship is pitching and rolling back and forth! WooHoo! We did use a static "wand" to ground the cable that the helicopter dropped down to the flight deck, however.
That's a slightly different situation than being at a local gas pump!!

[This message has been edited by Scott C (edited January 09, 2001).]
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Old 01-09-2001, 11:06 AM
  #44  
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They have been having problems with pickups with plastic bedliners at gas stations.
Apparently you can built up a pretty hefty charge on yourself (which happens to be opposite the charge that the bedliner has built up) and during the process of sticking the nozzle in, then getting back in the truck to keep warm and getting back out again, you get some electrostatic stuff going on and when you touch the truck, BOOM!

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Old 01-09-2001, 06:15 PM
  #45  
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well it looks to me like we've had all the fun we can with this thread so i'm locking it. if you wish to continue this please repost it, and try to keep it close to being tech. i just want to prevent any hard feelings or flame wars. thanks

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