Car stalling after filling with gas

CARLIELUV

MEMBER
2007 PONTIAC VIBE
1.8L
4 CYL
2WD
AUTOMATIC
70 MILES

Hi I have a 2007 pontaic vibe. My check engine light came on and the code po453 pressure sensor cane in. I had that and the purge valve replaced. The light came back on with new codes po171, p0441, p0455. The car runs fine until I fill it with gas. It will not start unless I keep my foot on the gas for 30-45 sec. No one can seem to tell me what this is for sure and I don't want to spend a small fortune on parts and labor that aren't needed. Please help!

4 Replies

JACOBANDNICKOLAS

MECHANIC
109,709 POSTS

It sounds like fuel is getting into the EVAP system. On a fuel injected engine, when you put the pedal to the floor, you basically shut down fuel to the engine. My belief is that the engine is flooding with fuel via the EVAP. Tell me, do you fill the tank when this happens? Do you, by chance, top off the tank (slightly overfill)?

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Tuesday, November 18th, 2014 AT 5:07 AM

CARLIELUV

MEMBER
2 POSTS

It doesn't matter if I fill it or just add gas. I think it has something to do with having the gas cap off. I used to overfill until this problem started and was told that was bad. I did it with my old car with no issue. According to my research I'm thinking it's the vent valve attached to the charcoal canister or the pcm. What do u think?

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Tuesday, November 18th, 2014 AT 7:01 AM

JACOBANDNICKOLAS

MECHANIC
109,709 POSTS

I feel it has to do with fuel being vented to the canister. Most likely, the vent isn't allowing air to exit the tank when you refuel. As a result, it makes its way to the engine that way. And yes, when the pump clicks off, the tank is full and no more should be added.

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Tuesday, November 18th, 2014 AT 7:31 AM

JACOBANDNICKOLAS