Question about 1999 Pontiac Sunfire

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On first crank fuel pump doesnt hold pressure and has to be cranked on for several seconds

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If the pump won`t hold pressure and you have long crank time to start car then your fuel pump needs replacing before it quits completely and you should replace the fuel filter at the same time.

Posted on Mar 15, 2011

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Sounds like its not working properly, the fuel pump pumps or it does't, then goes to regulator this is where pressure is adjusted. check fuel pressure with gauge, sometimes even new fuel pumps don't pump enough fuel. most fuel injected cars have over 50 pounds pressure.

Posted on Mar 15, 2011


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Don't know this car. Check fuel pressure with a fuel pressure gauge- if correct, not a problem with the pump. Also make sure the pressure will hold for some time with key off. It should hold pressure for several minutes, maybe 20 minutes, some maybe a bit less, but it must hold pressure for a time. If pressure is good, check for spark when it won't restart. If spark is lost, suspect the crank position sensor.

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