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1996 GMC Sierra Fuel Pump problems


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RSchoenrock
New User

Feb 20, 2010, 12:25 PM

Post #1 of 6 (11839 views)
  post locked   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
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Feb 20, 2010, 4:53 PM

Post #2 of 6 (11813 views)
  post locked   Re: 1996 GMC Sierra Fuel Pump problems  

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, 8:48 PM

Post #3 of 6 (11801 views)
  post locked   Re: 1996 GMC Sierra Fuel Pump problems  

There is no spark and no fuel pressure.


Loren Champlain Sr
Veteran / Moderator
Loren Champlain Sr profile image

Feb 22, 2010, 6:17 PM

Post #4 of 6 (11795 views)
  post locked   Re: 1996 GMC Sierra Fuel Pump problems  

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


PeggyB
New User

Aug 25, 2011, 1:16 PM

Post #5 of 6 (9390 views)
  post locked   Re: 1996 GMC Sierra Fuel Pump problems  

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
Hammer Time profile image

Aug 25, 2011, 1:54 PM

Post #6 of 6 (9385 views)
  post locked   Re: 1996 GMC Sierra Fuel Pump problems  

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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