2003 Safari cranks but doesn't start - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 07-19-2014, 03:19 PM   #1
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Default 2003 Safari cranks but doesn't start

My Safari will crank, but not start. It happened a few days ago, and I replaced the relay, then it started right up. The other day, it didn't start in the morning, but started up no problem in the evening. This morning it cranks fine, but won't start.

I hear the fuel pump, and changed the relay, still does not start.

Not sure if it is related, but the car has had some random misfires for a little while. We just haven't driven it very far, and that hasn't been a problem. The engine would run fine, but if we drove it too far or too long, it would misfire. After a day or two, it would run fine again.

Any suggestions would be appreciated.
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Old 07-19-2014, 03:58 PM   #2
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You need to get a fuel pressure gauge and a spark tester to see if it'* a no fuel or spark issue your having.
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Old 07-20-2014, 03:17 PM   #3
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Thanks 75 Racer. I have spark, and fuel is coming our of the check valve, but the fuel pressure is reading zero. Fuel pump?
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Old 07-20-2014, 03:30 PM   #4
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did you turn the key on and off a couple times to repressurize the system? try it on a different car?
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Old 07-20-2014, 04:58 PM   #5
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Sure sounds like a pump......double check power AND ground at the harness connector to the pump.....have seen bad grounds.....
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Old 07-20-2014, 05:25 PM   #6
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It did seem a little strange to get a zero reading because some fuel did spray out while connecting the test line. I am checking the readings again.
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Old 07-20-2014, 07:16 PM   #7
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a lot of the times the impeller will spin on the electric motor shaft which will still spin enough to move fuel but not enough to build pressure. I would say its time for a fuel pump.
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Old 07-20-2014, 07:46 PM   #8
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After exchanging the pressure gauge for one that works, the fuel pressure is 59 psi when cranking, then settles in at 58 before falling slowly after turning the car off.
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Old 07-20-2014, 07:47 PM   #9
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From what I have been reading, that looks a little low, so the fuel pump maybe bad. Does that sound right?
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Old 07-21-2014, 05:58 AM   #10
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For my 2002 S10 4.3, AllData says KEY ON, ENGINE OFF 60-66 PSI.
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