5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

Fuel Pump Doesn't Run While Cranking

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Old Jun 4, 2007 | 03:27 AM
  #11  
dustmark's Avatar
dustmark
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Joined: Jun 2007
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Default RE: Fuel Pump Doesn't Run While Cranking

I'll give it a shot tomorrow it the daylight. So what if there is an output from both of those wires and still no fuel pump running? Bad computer?
Old Jun 4, 2007 | 03:37 AM
  #12  
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mattdel
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Joined: Nov 2006
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From: Spfld, MA
Default RE: Fuel Pump Doesn't Run While Cranking

yah. if the pump kicks on while being jumped or the key-on, yes, computer, but you have other leakdown issues in the lining.
Old Jun 4, 2007 | 03:41 AM
  #13  
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dustmark
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Joined: Jun 2007
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Default RE: Fuel Pump Doesn't Run While Cranking

I was afraid of it being the computer, the other one I was given is dead as a doornail. Makes me wish I would have just put a carb on the damn thing and had it running two months ago. The leakdown thing has me stumped too. I guess that I'll just try to track it down fitting by fitting until I find it. One problem I just thought of is I opened an allen screw vent in the fuel cell cap to try and vent the fuel cell and that is probably why the fuel system isn't holding any pressure since the system isn't sealed anymore. Thanks for your help and extremely fast responses.
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