[sorry if this is posted in the wrong forum]

So you decided to disable/remove the charcoal canister? Well.. then I have important info for you! If you don't have the charcoal canister then you are at risk of something bad.

I have noted several cars that had excessive pressure in the fuel tank. It was way,way too much, I would consider it dangerous. I disabled my canister and then I also had the dreaded high pressure syndrome.

I actually noticed it when I turned off my car and the fuel pump was still pumping. I thought the oil pressure guage might be bad but I popped the gas cap. When that happened the pump stopped and alot of pressure was relieved.

So I have the solution. Just drill a few holes into your gas cap. Do it on the inside just through the first layer of plastic. Blow through the center of the cap. You just converted it to a vented cap. No more exccesive tank pressure or loud pumps

 

Another easy solution is to pull the spring and check valve out of the pressure relief valve next to the gas tank. Replace with fuel resistant foam filter and the problem is solved.

 

When you pull the CC and remove all of the tubing you still have the nice hard line on the frame rail right next to the feed and return. Just use some fuel hose and extend it ... and then put a small fuel filter on the end. Finally just stuff it up into the front fenderwell to vent. Mine has been like this for a long time.

Transferring to the TPI board where it is more appropriate ...

Tim

 

Just don't do any high G R/H turns.
You'll get to paint the **** end of the car with gasoline. You'll be amazed with how much fuel can escape thru 2, 1/8" holes.
BTDT

 

Ditto

 

THats great, but if your inspection station tests your gas cap, like they do here in Mass, then you'll fail.

-- Joe

 

I find that it's better to not vent the cc line in front of the car for two reasons. 1. it's faster to find something to plug that line and vent the cap 2. there is no potential gas smell coming from the car/engine compartment.

I don't think a high g corner would leak very much. Those holes are not through the entire cap. The cap was made to be vented or non-vented. Maybe a better pic would show you. There is small vent holes on the cap just on the outside of the o-ring that was "factory". I just drilled through the center just enough. It's easy to see if you pull your cap. THe center of the cap is baffled..

This would be for non-emissions cars. That is why I stated "if you don't have a charcoal canister then read!".

 

The main point is to make sure to relieve the gas tank pressure if charcoal canister is removed. I have seen tanks that had really high pressures.It is dangerous. A vented cap is the best solution,IMO.

I seen the factory vents, when I driller through the plasic I felt a baffle. So instead of drilling through it I blew through the inside if the cap and BINGO it was vented. If you don't like the "free mod" then just go buy a vented cap.This IS a safety issue....

 

I would be interested in knowing a p/n for a vented gas cap that fits, as i will be removing my canister when i re-do my C950 harness with no emissions controls.

 

ask the local parts store for a vented cap or get one online. BUT like I said, the non-vented caps have the passageways and outside vents. You just need to make a few small holes to reach the "chamber"....

 

Yeah i can just see that, "What year/model is that?" that's why i wanted a p/n. i'll spend the 5 bucks instead of drillin mine.

 

Is there any advantage to keeping the CC? Or is it better just to trash it, run a vent, and save some room in the engine compartment?

 

If you are "down under" then you shouldn't have emissions. If so then I would remove it.It does add room and looks alot nicer. If you want to keep the canister than I would suggest to mount it upside down under the battery tray. I have seen the factory do this before. But I do know that removing the canister will only make you fail the visual inspection .

 

I took the hard vented line right out from under my car. Is that good enough or do I need to do something more? Now whats that other line coming from the tank that has what looks like a filter on it? Is this the check valve thing you guys are refering to? I was gonna get a new GM one this spring, do I need it or can I take it off. I do have fuel smell from my car and it is NOT a leak.

 

A couple of laps around BIR and I am willing to bet you would think differently . Seriously though, I've seen people have problems with leaking vented caps on road courses. They are a no-no on road courses. Even a small leak would be unacceptable, IMO.

I rarely notice the fuel smell from my car and it certainly is never bothersome.

 

You are talking about conditions that(most) never occur on the street. My car can take a corner very,very hard. But on the street it's impossible to take the suspension to the limit. One little road imperfection and the car will "skip". This is at extreme speeds. A road course, yes I can see that a vented cap could cause a problem. The oem's thought is was quite safe untill the emissions laws. I would rather have a potential gas leak from the cap then in the engine compartment or under the car(with a filter on the vent line). I guess I'll just have to cut the vented gas cap in half to show everybody. It's not going to leak fuel!!!

 

I dont have a canister. It was removed when I took out all my emissions. I have no pressure issues with my tank. The vent line that was attached is still there. I have no problems.

 

The GAS tank is supposed to hold pressure. If you let the pressure out, you can cause the fuel to go stale AND you are basically wasting fuel. it is, after all, the fuel that is evaporating.

If Vader sees this post he will elaborate quite a bit I would think.

 

It does hold pressure...

 

heh, i want to keep the charcoal canister in my car, but theres no room underhood.... so if anyone has managed to put a 4thgen over tank style or other style canister elsewhere in the car, here would be a good place to post it...

 

Another thing is that there shouldn't be excessive pressure. That is what the thread is about. I have seen several cars that had really high in tank pressure.It was because of the CC delete. Too high of pressure is bad. Just asked my fuel pump that kept spinning (at sutdown)cause of the pressure. I would like to hear what vader has to say. He is a cool guy...

 

I to had the issue of too much pressure building up in the tank after removing my canister. I also tried the small holes in the cap, that worked fine with the exception of I noticed alot of oder of gas from it when I pulled in the garage and shut the car off. On a hot day it was awful so, I put a thread out here last summer and asked the same question about venting the tank in a better way. Vader answered it and gave me the idea of putting my canister back in and running the line that used to go to the orig carb and putting a filter on it. It is mounted down just below the frame rail tie wrapped in place. Works great and I don't get the strong gas oder any more. I put my other gas cap back on to seal that back up again. The Vader saved the day for me..

 

Maybe you didn't do it the same was as me. I have no problem with smelll. I guess the bottom line is to vent the tank if you remove the canister.....

 

could someone post how to do the CC delete with maybe some pictures? wht did you do with the wiring? which line is the return etc....

 

If you're looking to move your charcoal canister somewhere else so its out of the way, just strap it securely to the bracing thats either in front of, or behind the radiator. I forget what one it is, but i saw someone on this board do it when he had installed his SLP CAI. It looked really clean and was much easier the relocating it to the other side of the engine bay.