Question about 2000 GMC Safari

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Engine cranks but doesnt run

My 2000 gmc safari 4.3 engine takes time to start running, it cranks but doesnt run. after a couple of hours it runs and i dont have problems for the rest of the day, so once it runs it works good , no problem, but next day or cold engine , i have the same problem it takes time to start running. I checked the fuel pressure and it has 50 psi when works good, and 40psi when engine doesnt run. it should be 60 psi . i put new fuel filter. How to I know if the problem is the fuel pump or the fuel pressure regulator? or you think something else could be the problem?

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ron holmes
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To check fuel pump ,disconnect fuel filter and then turn the car over for about 5 seconds and see if fuel is coming out from the gas line that comes from the fuel tank this line connects directly to the fuel pump. it is best to have 2 people do this. if there is no fuel coming from the line then check your fuel pump relay about $10 a new one ang about $200-$300 for new fuel pump.Good Luck !

Posted on Jul 08, 2010

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James Milzheimer
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It almost sound like a bad coolant temperature sensor, but that is just a shot in the dark. I did have a 1995 LeBaron that had the same problem, and it had a bad coolant sensor. Is the check engine light on? Are you getting spark when it cranks but won't run? The fuel pressure itself, may have something to do with it, and with fuel pumps, they have a PSI specification, but there is also a volume of fuel amount, such as 1 pint in 15 seconds, I'm not sure what that amount is for you vehicle, but that maybe something to consider. I'd check for any vacuum leaks too.

Posted on May 27, 2010

  • jibarra2182 May 28, 2010

    there is no check engine. it has spark, ect sensor is good , how to i k now if the fuel pressure regulator is not working good.

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