anyone know much about emissions crap? mainly the evap control / pressure test crap, not the pressure test of the gas cap,im not that big of an idiot.

 

what specifically are you worried about?

 

Other than the concept, that the gas tank must be a closed loop capable of handling "x" pressure so that fumes are not escaping into the atmosphere. I have a vacuum system here that I used to troubleshoot mine 2 years ago when it failed. Are you having trouble or did you want specific answers?

 

well i failed the pressure test part, so i replaced a buncha lines under the tank and to the charcoal canister last night,so the only other thing i need to check is the filler neck i think. i dont wanna run through emissions again and fail then have to pay to try next time.

 

If you can, go to Autozone and buy their vacuum tester/brake bleeder kit. It's a plastic handle mounted on a plastic bottle looking thing with a gauge on it . Disconnect one of your fuel lines near the fuel pump and plug it with a large bolt or philips screwdriver. Mount the vacuum tester on the metal line you exposed by removing a fuel line, and secure it. Start squeezing, your going to be squeezing until the gauge registers. Then walk away nursing your sore hand for a couple minutes. If the vacuum stays your good.
For what it's worth, if it even registers your good, but it should hold it. It usually works better if there is more gas than empty space in the tank, but it is possible when it's near empty like mine was. Also, check to make sure your pressure relief valve is in good working order. Mine wasn't and thats why it failed.

GL!

 

is the pressure relief thing under the tank?small white thing, in my book it was called the pressure valve or somethin,n autozone n checker didnt know what it as n didnt have a new one

 

That's the peice. It's like 6$ at the dealership. I cot mine from Bell Chevrolet. They had it in stock. Typically it goes bad before your lose anything else. If you test it you should have to blow REALLY hard through it to get it to release. If it's easy tp blow through it's probably bad. Take the old one with you when you go so they can get the part number off it.

GL!

 

uh oh... you're supposed to keep that on there?

 

Yes you are. Without it you are venting fumes.

 

any specific way to check the filler neck? cause a while back i remember whenver i ahda full tank i could kinda smell a lil bit of gas once n a while

 

gasoline is a very very non-viscous fluid if there was even a slightest pinhole or anywhere air would escape it would leak i would guess that if you had that contraption that Chris was talking about you could pull a vacuum on the gastank and see if there was a loss of vacuum

 

well i pulled off the heat shield n looked up at the filler neck n this is what it looked like,so im guessin this is the problem....

 

yeah.. I would say you have some leak there. Don't smoke while working on it.

 

yeah,im in the process of droppin the tank now. itll be a blast, i just hafta go get a syphen thing to get all the gas out,i dont wanna suck on the hose n get a mouth full of gas.

 

shove a hose in there pretty good but don't get it stuck stuff a rag around it to try to seal it off the best you can and BLOW in the tank it will work just as good

 

What year Camaro do you have. I read somewhere ther was a recall on the later (late 80's early 90's) because they can develop a tiny hole in the filler neck. Would be nice to get it fixed for free.

 

its an 88 sc. 2.8. what i did to drain it was actually took off the fuel line and stuck a hose to it,and put a wire from the battery to the G terminal, the way you check if the fuel pump is workin,n then jsut ran it till it was empty. it worked great,it waseasy to. im about to go out their n take out the tank now.yipee......

 

Chevrolet replaced the tank in my 1991 camaro due to pinholes in the filler neck. I had bought the car 2nd hand and they still did it for me.
They did this a while ago, I'm thinking it was in 1995, and I can;t recall what model years it covered-
Hope the repair works out for you-
S-D

 

yeah,oh well,im almost done w/ it anyways,im about to pull out the tank , n i can do the repairs myself,n id prolly do it faster n better then those ppl anyways,n i got the car like 3rd or 4th hand,knwoin my luck id get screwed by the ppl anyways,thanx though

 

thanx for the help everyone,i ficed my tank,so im happy,jsut had a couple small pinholes where the neck meets the tank,so its all good now..

 

good job!!