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Chevy Silverado and GMC Sierra Fuel Pump/Fuel System



  • cologuy
    I may have the same problem as you have, i also installed a new pump and can only make it work with a 12 volt jumper, looks like i only have 5 volts at pump but i do have 12 volts leaving the fuse pump, did you come up with anything?
    Thanks in advance
  • cologuy
    I may have the same problem as you have, i also installed a new pump and can only make it work with a 12 volt jumper, looks like i only have 5 volts at pump but i do have 12 volts leaving the fuse box, did you come up with anything?
    Thanks in advance
  • I have the same issue, did u happen to find the problem? Thanks in advance.
  • I have the same issue. Have you found the problem?
  • Yes! I did find the problem, it was the red connector that is under the fuse box (I think there are four large square connectors). That red square connector sends power to several things, but the very corner pin feeds the gray wire to the fuel pump. The blade (male part) of the fuse box was not making good contact with the female part of the connector, i do not know how that happened because the truck had always been running before with no problems and that connector is held on with a screw in the middle.
    I was almost ready to change the contol module because that is what controls the fuel pump but i did have 12 volts at the 20 amp fuse that was not getting to the pump.
  • onvolonvol Posts: 2
    I Have a 1999 GMC Sierra. I replaced the fuel pump about 8 months ago. My cousin is a master mechanic and he helped me wire it up, the fuel pump I got from O'reilly Auto Parts was a universal style for a few different years of the sierra. On my model I had to reverse the power wires and rewire it with the supplied plug. (came with multiple plugs as different years have different plugs. If this helps, your welcome :-) I wouldn't of figured it out on my own as always before red goes with red black with black... not red /black , black/red...
  • Same issue only I have the 5.3. Did you find a soloution to this issue? had all plugs, wires, fuel pump replaced 2 months ago. any suggestions?
  • srg67srg67 Posts: 1
    I am having the same problem i replaced the fuel pump it will start but just for a few seconds then dies. Can you hear your fuel pump come on when you turn the key on?
  • dan265dan265 Posts: 1
    sounds like I have the same problem. What color wire did you jump at the pump? Thanks in advance
  • onvolonvol Posts: 2
    The way I had to do my wiring on a new fuel pump as per a master mechanic cousin of mine: 1. Hook up black and white on pump side to black wire on truck side.
    2. Hook up all matching colors left.
    3. There are 2 wires left that do not match, hook those up.

    This was used for a 1999 sierra 4.8 with replacement fuel pump from O'reilly's Auto Parts.
    If this helps, feel free to say it worked for you! I hope this solves alot of your problems. :)
  • 86low86low Posts: 2
    2000 GME Sierra SLE 5.3
    When I put gas in, the fuel handle keeps kicking back. I have to hold the fuel handle on as soft as possible to keep it from kicking back. It takes for ever to fill up.
    Anyone know why & a fix?

    Any help would be great.
    Thanks Mike
  • ph10ph10 Posts: 1
    I have the same thing going on with my truck. I notice a hissing sound in the gas tank area. I googled it and found a guy who said there was a hole in the fuel line coming up from the pump to the top of the pump assembly. The fuel is drianing back into the tank and pressure is not holding. The fuel line apparentlly rubs on the springs that hold the pump on the bottom of the tank. Now I have to find out how many electical connections my pump has so I can order the right one. All is see on the searches I've done show that unbolting the bed is easier than dropping the tank.
  • I had no tail lights at all. I replaced brake light fuse, signal flasher. Now when I turn on my park/head lights, the stupid fuel pump runs for about 5 seconds. The truck runs fine, the front lights work fine, I have no rear park/brake lights., only signal lights.

    Ran new ground wire at bumper in place of a rusty one. Inspected for loose cables, checked bulbs, checked fuses....Now I am lost, and need help. :confuse:
  • I have a gmc 2500 6.0 v8 sierra, the last few times i have been a issue I cant quiet put my finger on. At ignition the truck seems to be starving for fuel after i give it a little gas it kicks right over. I'm unsure if its the fuel filter or the spark plugs or what I am looking at.
  • erberichrerberichr Posts: 1
    Will not keep running

    by erberichr

    Jun 08, 2013 (7:53 pm)

    1995 Silverado - Ran out of fuel.
    1) Added more. Vehicle started ran a few seconds and died.
    2) Replaced Fuel Filter Same symptoms.

    When vehicle does start, I can pump the gas at it will run a little longer.

    I think it might be the Fuel pump relay.

    Any Suggestions?
  • cg9629cg9629 Posts: 2
    I have a 95 gmc sierra z71, it has the 5.7 350 in it. Ive been having problems trying to repair the truck, the truck starts percfectly most of the time and it will run for a while until i try to put it on Drive then it just dies, after a couple of times of doing this the truck won't start, i try pouring fuel into the carb and it will start briefly but will die soon after, while runnin i hit the gas and in squirts fuel but suddenly stops, ive replaced fuel pump, fuel filter fuel relay, ignition coil, control module, rotor, but still no solution. A couple of people have told me to replace the pick up coil but that involves removing tr distributor and ive never done that. My question is, could the pick up coil be causing this?? Or does anyone know of anything else i should check??
  • truck will run 10-20min and die cool down 10-15-min will restart and repeat same. sometimes will run 60 min in park . replaced fuel pump & filter and all relays.
  • I have a 2002 GMC Sierra extended cab 4.8L V8 was having trouble on cold start with the ideal smooth ones warmed up now the truck turns over but won't stay on and I hear a clicking poping sound from under the truck center consol location can someone help Thanks

  • @dptaylor said: Hi, this is my first time on a site like this, I'm a woman in Jamaica with a fabulous truck that myself and anybody else that rides in it or just sees it loves immediately. I do have a Large Problem with going through Fuel Pumps, as this is my 4th one for the year. One mechanic suggested using an external correct psi fuel pump like in the days of the Carberators. ??? What do you think. This is what has happened 4 times now. Please remember Jamaica does NOT have wonderful fuel. So maybe an additive could help, any suggestions would be appreciated. TRUCK WILL BEGIN TO HESITATE WHEN TAKING OFF, THEN THE CHECK ENGINE SOON LIGHT COMES ON, THEN ON THE SIDE OF THE MOUNTAIN OR ON A VERY SKINNY ROAD I FEEL MY TRUCK LOOSE POWER AND THE ENGINE STOPS AND ALL THE DASH LIGHTS COME ON, (THIS ALL HAPPENS IN A MATTER OF 10 MILES OF DRIVING) THEN I BEGIN TO PRAY AND TRY TO FIND A PLACE TO PULL OVER SO THE WILD DRIVERS DO NOT RUN INTO ME. MY PRAYERS HAVE BEEN ANSWERED AND I ROLL TO A SAFE PLACE. THEN THE EMBARASSMENT OF MY LOVELY TRUCK BEING TOWED TO THE LOCAL RACING SHOP. (I FIGURE THOSE GUYS ARE THE MOST UP TO DATE ON HOW TO FIX THINGS.) WHEN THEY GET THE FUEL PUMP OUT AND TAKE IT APART THE BRUSHES ARE ALWAYS DOWN TO NOTHING. WHEN FIXING WE 1) REMOVE TANK AND CLEAN 2) REPLACE THE PUMP 3) REPLACE FUEL REGULATOR, UP ON THE ENGINE 4) REPLACE ALL THE FILTERS. THIS MECHANIC FEELS I BURN THE PUMPS BECAUSE I RUN MY TRUCK ABOUT 18-20 HOURS A DAY WITH THE A/C ON FULL BLAST. I AM SOMETIMES AT A STAND STILL FOR OVER 30 MINS. ANY IDEAS OUT THERE? MANY THANKS DPTAYLOR :sick:

  • Silverados are famous for fuel pump problems. To make changing the pump an easy snap not requiring dropping the tank or shifting the bed, I cut a trapdoor in the bed right above the fuel pump. 7" wide X 12" long. 14" in from the side and 6" back from the front of the bed. I riveted two strips of sheet metal to the sides of the cut out piece and these secure the trap door to the bed with sheet metal screws. Changing the pump is a 20 minute job for one man. This fix will work on any truck with the fuel tank below the bed and the pump in the tank. Why didn't Detroit make a door here? Perhaps $300 dollars for fuel pump replacement will give you an idea why!

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Chevy Silverado and GMC Sierra Fuel Pump/Fuel System - Page 14 - Car Forums at