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2005 chevy Classic Vaper canister vent valve/solenoid
04-06-2019, 09:48 PM
Post: #1
2005 chevy Classic Vaper canister vent valve/solenoid
I have a 2005 Chey classic. I had it parked all winter because of leaking brake lines. I just fixed the brake lines and went to start the car to bleed them but it wouldn't start. I replaced the fuel pump relay, fuel pump and filter. I got the car started, but fuel started pouring out of the vaper canister vent valve. I swapped the vaper and fuel return lines and the vent valve but have the same problem. I, out of desperation, tried the Just Answer scam for a $1 7 day trial. After 3 "experts" I was told the fuel tank is bad. But I don't want to try an $800 part swap on a car I bought (running) for $100. Any serious thoughts?
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04-06-2019, 10:58 PM (This post was last modified: 04-06-2019 11:32 PM by Rupe.)
Post: #2
RE: 2005 chevy Classic Vaper canister vent valve/solenoid
I'm not an expert on that vintage but I can tell you there should be no fuel in the vent lines or the vapor canister... UNLESS... the tank has been overfilled to the extreme and / or the vehicle has been parked on a VERY steep slope, where fuel may have migrated just due to strange circumstances.

Could the fuel tank be bad? Can't say from here, but before spending $800 on a new one I would certainly spend a bit of time on diagnosis.

Are there other ways for fuel to get into the vapor system? Sure. It's possible the vent solenoid is bad (usually sets a code) or the gas cap is no good (may also set a code) and excess pressure has forced fuel into where it shouldn't be. OTOH, you just had the tank open to replace the pump so you would know how much fuel was in the tank (roughly) and you probably noticed that it's impossible to mix up the fuel line connections. Also, the tank vent (at the tank) doesn't go into the fuel, but is at the top of the tank so no way to actually grab fuel unless the level is up to the brim.

Personally, I would pull a few vac lines to see if fuel may be coming from other sources, such as the back side of the fuel diaphragm on the pressure regulator.

Keep us posted on your progress.
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04-07-2019, 09:15 AM
Post: #3
RE: 2005 chevy Classic Vaper canister vent valve/solenoid
Thanks for the response. The tank being bad made no sense to me. Your right, the vent is on the top. I disconnected the line coming into the top of the vapor canister and there is fuel coming back as if it is the return line to the tank. But as I said I already swapped the only 2 5/16" lines. One goes back to the pump, the other to the vapor canister. I will go under the hood and give it another gander. I keep you up to speed as to what I find
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