2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

No fuel pump signal

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Old Aug 16, 2009 | 04:16 PM
  #1  
turnski's Avatar
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From: Shingle Springs,California
CA No fuel pump signal

Ok went through all the things on the flooding issue from yesterday, and the advise that i was given was excellent., But now I have no fuel pump signal , I only have it when cranking , the fuel pump doen not come on when you first turn on the key, So have checked all the usual suspect . where should i go next ?
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Old Aug 16, 2009 | 05:47 PM
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From: ct
you need to list what you checked
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Old Aug 16, 2009 | 05:50 PM
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The fuel pump isn't supposed to run when you turn the key to the 'ON' position. It will only run under these conditions:
  • Cranking
  • Engine is running
  • The AFM door is propped open & key is 'ON'
  • The yellow test connector is jumped & key is 'ON'
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Old Aug 16, 2009 | 06:02 PM
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Circut opening relay, Fuel pump relay, and main relay, all have power and ground, have all been checked.
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Old Aug 16, 2009 | 06:06 PM
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where is the yellow test connector lacated at ?, Thats funny because I used to hear the fuel pump run when I would turn the key to the on ( aka run ) position and now it does not. It's the stock air flow meter but some one has adjusted the adjustment screw on it so could that be the cause of the running condition I currently have ? it will start and only run for a breif few seconds and die like it's suffering from a loss of fuel.
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Old Aug 16, 2009 | 06:15 PM
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The test connector is near the passenger-side strut tower. If you used to hear the pump run with the key to 'ON' only, someone has re-wired it & bypassed the circuit opening relay. The adjust screw on the AFM just changes the amount of air that is allowed to bypass the flapper door. It has nothing to do with the fuel pump switch.
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Old Aug 16, 2009 | 08:41 PM
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It was the airflow meter that went south for some reason , so i swaped it out with the one from my 88 Vert and she fired right up. so guess I have to find an air flow meter now.
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