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1996 GMC Sierra Fuel Pump problems


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RSchoenrock
New User

Feb 20, 2010, 2:25 PM

Post #1 of 6 (9823 views)
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     1996 GMC Sierra Fuel Pump problems  

I have a 1996 GMC Sierra 4x4 1500series 5.7 litre motor. I have changed the fuel pump, cap and rotor, coil, fuel relay switch and the wiring has been checked. The vehicle still won't start. Turn the key to on and the fuel pump is not heard. Turn the key to off then the fuel pump begins to kick in. Please help driving me crazy.


Loren Champlain Sr
Veteran / Moderator


Feb 20, 2010, 6:53 PM

Post #2 of 6 (9797 views)
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     Re: 1996 GMC Sierra Fuel Pump problems [In reply to]  

RSchoenrock; The two main things we need to check: 1. Are you getting spark to the plugs? 2. Are you getting sufficient fuel pressure? The Vortec motors require 60-66psi fuel pressure. At 55psi or below, it probably won't run. Check these two things, then get back to us. There are many other possibilities, but on that particular engine, these are the two most common.
Loren
SW Washington


RSchoenrock
New User

Feb 21, 2010, 10:48 PM

Post #3 of 6 (9785 views)
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     Re: 1996 GMC Sierra Fuel Pump problems [In reply to]  

There is no spark and no fuel pressure.


Loren Champlain Sr
Veteran / Moderator


Feb 22, 2010, 8:17 PM

Post #4 of 6 (9779 views)
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     Re: 1996 GMC Sierra Fuel Pump problems [In reply to]  

RS; Check fuse G12 in the underhood fuse/relay box.
Loren
SW Washington


PeggyB
New User

Aug 25, 2011, 4:16 PM

Post #5 of 6 (7374 views)
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     Re: 1996 GMC Sierra Fuel Pump problems [In reply to]  

My ground wire was not attached this made my fuse burn out. Thanks this saved me a lot of money.Angelic


Hammer Time
Ultimate Carjunky / Moderator


Aug 25, 2011, 4:54 PM

Post #6 of 6 (7369 views)
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     Re: 1996 GMC Sierra Fuel Pump problems [In reply to]  

This thread is a year and a half old. Please don't respond to old threads.




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1996 GMC Sierra Fuel Pump problems


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