Pontiac Problems? Ask a Mechanic for Answers ASAP
Hello, Eddie here, it's not a bad filler neck in my opinion. Especially if you can pull the gas cap off and it still does it, Is the check engine light on now when it's running? I would think fuel pump, or fuel pressure regulator, or mass air flow sensor. let me know.
Check that and let me know what you find there. thanks.
Do you have fuel pressure at the rail now? Need a gauge to check it.
You would have to check power to the pump next, If you take the gas cap off, and get somebody to turn the key on, you should hear it buzz, now if you hear it buzz, then you know it's got power, but just because it buzzes doesn't mean it's got pressure, I've seen pumps run before and buzz and not have 2 psi of pressure verified with a gauge. So don't bank on it having pressure just because you hear the pump run. Let me post the wiring diagram, Check the GREY wire going to the fuel pump for power when cranking, should have battery voltage, I believe you do have power to it though but I would make sure it's 12 volts. if it is 12 volts and you have a good ground on the BLACK wire, (it goes straight to ground) then likely the pump itself is bad.
Let me know if you have any further questions. Thank you.
Sorry about that. Let me opt out. Somebody else may be able to assist. thanks!