Fuel Pump stopped working

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Old May 13, 2010 | 11:01 AM
  #1  
cloned25's Avatar
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Default Fuel Pump stopped working

I wanted to know what common problems are for blowing the fuel pump fuse or relay? I was driving the other day and the fuel pump stopped working 1 minute after starting it up from a short stop. I checked the positive terminal of the pump and no voltage, so I ran a fused wire from the battery and was able to get the car home. So now I figure it is the fuse or the relay that blew, but I wanted to prevent this in the future, is this common? Has this happened to other before? One note, my ECM is on a kill switch, so I turned off the switch when I stopped, was a shady neighborhood... lol. thanks in advance.
 
Old May 13, 2010 | 12:58 PM
  #2  
z28pete's Avatar
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If the pump fuse blows, there is either a short circuit on the pump wiring, including the pump relay, or the pump motor is working too hard. The motor working too hard could be due to the pump going bad, or the pump is working too hard pushing fuel through a restricted fuel system (like a clogged filter). Electric motors don't know when to quit, and draw more current as the load incresase till they burn out or blow a fuse.
 
Old May 13, 2010 | 02:17 PM
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I would check all your wiring connections related to the fuel pump, front to back, at the computer, etc.
If you can hear your fuel pump priming when you turn the key on (activated by the relay), then I doubt the relay itself is what's making the engine kill. The pump relay and the oil pressure switch run in parallel (not series) to the fuel pump. An ignition signal from the distributor (running engine) keeps the pump relay activated. So, if the relay were to fail, the oil pressure switch would act as a failsafe and keep the pump running. Contrary to popular belief, the oil pressure switch is not a safety to kill the fuel pump if it registers no oil pressure. Taking all that into consideration, the odds are pretty slim that the pump relay AND oil pressure switch would be bad at the same time.
 

Last edited by Camaro 69; May 13, 2010 at 02:28 PM.
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