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Old 11-22-2011, 19:33   #1 (permalink)
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96 GT no power to run fuel pump

I ran a auxillary wire to the pump today and the pump ran .... However the car kept cranking over but wouldnt fire up....so my question is what can shut down the fuel pump power....I have read about the ingnition sensor or ignition pulse ( PIP )

Your knowledge is appreciated

Walter
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Old 11-22-2011, 19:56   #2 (permalink)
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Re: 96 GT no power to run fuel pump

If you turn the key to run without the wire connected, do you hear the pump run for a few seconds? Have you checked for spark when cranking? What engine is it?
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Old 11-23-2011, 08:58   #3 (permalink)
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Re: 96 GT no power to run fuel pump

Bert

I tested for power at inersa switch in trunk and no juice when key turns on....I have power at fuse.....

Walter
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Old 11-23-2011, 09:22   #4 (permalink)
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Re: 96 GT no power to run fuel pump

Is it the 3.8 or the 4.6?
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Old 11-23-2011, 09:27   #5 (permalink)
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Re: 96 GT no power to run fuel pump

There should be power at the dark green/yellow wire coming out of the relay box "for a few seconds" when the key is turned to on. The PCM grounds the light blue/oange wire for a few seconds at first key to run and when cranking, will ground it to keep the pump running. Is it the 3.8 or the 4.6?
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Old 11-23-2011, 09:36   #6 (permalink)
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Re: 96 GT no power to run fuel pump

Here's the diagram for the pump. Sometimes the crank sensor will cause the PCM to not fire up the pump but if it doesn't run the few seconds when the key is first turned on, that wouldn't be the cause.
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File Type: png Fuel pump.png (36.4 KB, 9 views)
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Old 11-23-2011, 11:32   #7 (permalink)
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Re: 96 GT no power to run fuel pump

Bert

Thanks for the diagram, ....its the 4.6.......with 187000 miles .....still runs strong.....I will check that out and let u know my results.
Have a great Thanksgiving

Walter
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Old 11-23-2011, 15:35   #8 (permalink)
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Re: 96 GT no power to run fuel pump

You're welcome. Happy Thanksgiving to you too.
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Old 11-25-2011, 10:02   #9 (permalink)
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Re: 96 GT no power to run fuel pump

Bert

I checked. The dark green /yellow. Wire, #5 on ccrm. Should b the same wire going to inerstia switch in trunk and no power. At first key....however. #12 coming in from? Is hot at first. Key .......I forgot. To mention when this event. Happened the radiator fan start!ed to run at first. Key now as well....this leads me to believe. Its the ccrm but no sure...
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Old 11-25-2011, 10:26   #10 (permalink)
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Re: 96 GT no power to run fuel pump

That wire should have 12v for a few seconds when the key is first turned on. When the engine is cranking, it should also have 12v.
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