Question about 1990 GMC Safari

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Not getting enough power to run the fuel pump and the ignition system

The van was running as normal when I parked it for the night I came out to go to work the next morning and it wouldn't start, I have changed the fuel pump and strainer , the fuel filter and the fuel pump relay, I have tested the power to the fuel pump and it is only 6 volts or so but the pump works fine if you jump directly to the batery but the car still wont start.

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

PyroPCMan
  • 405 Answers

SOURCE: my 92 gmc sierra ran

Well if youare getting fuel then the only other problem is spark, check and inspect plugs and wires, to do a test remove a spark plug and with its wire still connected crank the motor, if you see spark then that's not the problem, but if you see no spark then it could be plugs,wires, and or dist cap

Posted on Jun 27, 2008

keemo68
  • 1263 Answers

SOURCE: 1995 GMC Pickup Won't Start After Sitting Over Night

you have a weak fuel pump and it should be replaced. according to your observation the engine finally started but it was after alot of cranking. this indicates that the pump is not working like it should and can't keep the system primed.

Posted on Aug 29, 2008

  • 124 Answers

SOURCE: ran fine then would not start

If it has been rainy, snowy or wet at all were you live you will need to change the cap and rotor. These vortec motors with the horizontel cap are very well known for not starting when damp. Also while you have the cap off there are two holes in the bottom of the distributer with screens in them, clean these out or remove them to keep the moisture from returning.

Posted on Dec 30, 2008

csmock132
  • 4669 Answers

SOURCE: My 2000 gmc jimmy will not start. It will turn

Have you hooked up a fuel pressure gauge to the test port on the rear of the intake, drivers side. You can get a fuel pressure tester for about 40 dollars at a part store. It is a real good tool to have in your toolbox. If your Jimmy can't build 55 psi, it won't start.

Posted on Mar 07, 2009

csmock132
  • 4669 Answers

SOURCE: 1987 GMC sierra , no fuel pump power.

The inline fuel pump fuse on the passenger side firewall is good? Are you jumping it with 12 volts at the test lead or the fuse?

Posted on Jun 26, 2009

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I have a 1997 park avenue and my fuel pump will not come on i checked my fuses and relays the pump comes on when i jump it from the battery but when hooked up it wont pump fuel or make a sound whatelse can...


Several possibilities. One is that you said you checked the relay, but clearly either the relay is not getting power or is not working. Another is that the fuel pump only goes on for a few seconds if the motor is not running, so if you have left the ignition switch on, do not expect the fuel pump to keep running. You have to keep turning the ignition on and off. The system that is used to detect the engine running and shut down the fuel pump when the engine is not running, varies. I am mostly familiar with imports, and they tend to use alternator output to detect engine running so pump should stay on. Some US cars us the oil pressure switch, and you can tell because then the oil pressure switch has more than 1 wire.

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Why won't my car start? It was running last night.


Try start the car again when it is completely dry, if it starts the rain may be short circuiting something on the loom in the engine bay.

If it still wont start,

will it turn over? (car tries to start)
- If it wont turn over the battery would be dead

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Ran fine last night drove round trip prob 75 miles no prob parked tried to start in morming keepd cranking wont start less than 1/4 tqnk off gas banged on gas tank while cranking still wont start any...


One way to check the fuel pump is to turn the ignition to on and listen for the pump to run. It should run for a few seconds. It may be a couple of seconds after you turn the ignition to on before it runs. Normally you can do this repeated times.

If you don't hear the pump run that is most probably the problem.

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I have the same problem, I replaced the fuel pump. Did NOT solve it. i was told that it is a computer problem. The computer is not sending electric to the fuel pump, by cranking it several times the oil pressure builds up and will over ride the computer and send power to the fuel pump. This is a common problem on these asrto vans.

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