MY FUEL PUMP IS PUMPING GAS SO IS IT WORKING

  • Tiny
  • dudue45
  • 1994 Pontiac Grand Prix
  • 150,000 miles

1994 pontiac grand prix. Not sure if I have a vats problem or a clog in my fuel pump strainer when I turn key security light comes on for 5 seconds then goes out. No blinking. The car starts and runs for a few seconds then dies. The fuel pump is working. I have pulled the fuel line at the fuel filter and turned the key to on position no gas when I turn key to start gas pumps when I release the key fuel pump stops working.

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Tuesday, November 1st, 2011 AT 7:39 PM

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  • Tiny
  • hmac300
  • Expert
  • 43,637 posts

Thats' becaue the pump only works on initial key up and the oilpressure sender takes over after a start. But jump the relay and see if it pumps ok bu tleave everything connected. You will need 41-47 psi from teh fuel rail to run.

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Tuesday, November 1st, 2011 AT 10:30 PM
  • Tiny
  • dudue45
  • Member

Not sure are you telling me to bypass the fuel pump relay or bypass the oil pressure sensor? I did bypass the VAT system and still the same thing the car will start and then idle for about 5 seconds then shut off. The fuel pump is wroking hard in the tank but pumping gas. Thanks for the help

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Wednesday, November 9th, 2011 AT 9:02 PM
  • Tiny
  • hmac300
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  • 43,637 posts

Best thing to do is check the fuel pressure first on start up then after car runs. When the key goes on the relay sends power to the pump and it shodl give you pressure. After the car starts power is sent through the oil pressue sending unit to the pump. If it shuts off after starting then your oil pressure switch may be bad, check that.

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Wednesday, November 9th, 2011 AT 9:18 PM
  • Tiny
  • dudue45
  • Member

Ok is that something I should just replace in order to "check" it? Or can I jump a wire across the two terminals?

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Wednesday, November 9th, 2011 AT 10:03 PM
  • Tiny
  • hmac300
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  • 43,637 posts

You can jump it but make sur eyo have theright wires.

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Wednesday, November 9th, 2011 AT 11:19 PM

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