Question about 2000 Pontiac Sunfire

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Changed fuel filter, it startes and only runs for a second, I hear the fuel pump build up preasure ,but it does not stay running

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It sounds like you need to reset the built in security feature. It deactivates the fuel injectors & your car will keep cutting out. It takes about 30 mins. Rather simple procedure.

Posted on Dec 19, 2009

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Either the fuel pressure regulator is bad, or the fuel pump is on it's last legs.

Posted on Dec 11, 2009

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I have a 86 Toyota 4Runner, it will not stay running. It will start right away and run for about 5 seconds and then die and won't start unless I leave it alone for an hour or so. It cranks and wil


Good explanation of symptoms.Thank you.




No assumptions.
Diagnose problem.
Pinch off the fuel return line.
Check fuel pressure--I don't wanna!PITA!
The fuel pump won't run if the fuel filter is plugged up.
Toyota's have a gas tank drain plug!!!!!!!!!
My '84 takes a 3/8 " ratchet. Cool.

There may be a fuel pump relay that is toast,but I suspect the filter,off hand.
A plugged filter will overwork the pump and cause the engine to run rich.

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Have you checked if the pump is actually pumping gas by removeing the fuel line from carb stick it in glass jar and have someone else crank engine . if gas pours out change fuel filter if not replace fuel pump. if you are fuel injected disreguard last. get fuel pressure tester from auto parts store .they will hav specs on how many pounds of pressuere you should have if pump checks out good try replaceing fuel filter.

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Recently my C70 has started cutting out at low to mid throttle, most of the time it happens from a cold start. It acts like the fuel is being cut off and on, the tach drops immediately then picks back up....


Your description is a head scratcher. The best diagnosis I can come up with is a 'bad pre pump in the fuel tank or pre pump relay'. Fuel passes through a filter sock, then a pre pump within the tank to a second pump under the front seat before going through an in-line filter to the fuel rail where its pressure is regulated by a fuel pressure regulator before reaching the injectors. Can you hear the pre pump buzzing when you listen at the open filler cap (ignition at position 2 but no engine running). Does the second pump at the front of the car sound laboured? Listen for the pre pump and then remove it's fuse (11?) can you hear a difference? Return the fuse for the pre pump and remove the fuse for the second pump (1?) can you hear the difference. The car should just about run on one pump but wont start without any pump. This diagnosis would also account for the 'starting with the cap removed' observation.....one pump will find it harder to supply fuel if there is a partial vacuum build up in the tank.

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If you can keep spraying staring fluid and it stays running then the fuel pump is no pumping. only with a pressure gauge can you test it

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07 520 wont start no fuel pressure any ideas what sensor builds fuel pressure


First thing I would check is the fuel pump...Without starting the engine - what do you hear when you turn the key off and on?

Wait a few seconds between turning key off/on...you should hear the pump run and then stop; this is the pump reaching fuel pressure.

If the pump is not running; check fuses.

If fuses are good, check for restriction in the fuel line...posibble clogged fuel filter.

Mike...

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Toy starts runs 10 seconds and stops change fuel filter now wont


When you tur the key forward do you hear the fuel pump running? You should hear a low hum for about 20 seconds near the gas tank and then it stops. If you hear this your pump is good. If it keeps running or you can't hear it at all it's bad or the main fuel pump fuse is blown.

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2001 checy Tahoe wont stay running for more then 10 seconds?


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Wont stay running


Check all things airflow related. The PCV valve, the air cleaner, the mass airflow sensor and any other filters.

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2001 cavalier barely starts,sometimes runs for a few seconds, then dies. i already changed fuel filter,pump relay, new plugs also. i can hear fuel pump come on for a few seconds,when turning on the key....


Three things.
First, you need to check the MAF sensor for contamination.

Second, check fuel pressure, if you dont have a gauge, autozone and Advance have them on their tool loaner program.
Should see 35-40 psi with key on engine off, cycle key a few times, if it takes a while to build up, replace filter and retest.

Third, possible convertor blockage, easiest check is to remove the 02 sensor and try to start with the hole open, if it runs, then that is it, specs allow for 2-3 lbs of back pressure max. That means if you can hear pressure escaping, it is a problem area.

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