Question about 2000 GMC Sierra

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I need to replace the fuel pump, where is the

I need to replace the fuel pump someone said I may as well replace the wiring harness at the same time, where is the wiring harness?

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On the fuel pump

Posted on Jul 08, 2010

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2004 gmc sonoma will not start after very hard braking


This could be electrical, when you get engine not to start check your fuel pressure and also see if you have spark, this will help in finding the problem.

these trucks are none for electrical connector problems to fuel pump, by checking to see what the engine is missing ,like spark or fuel will help, check the ground to the frame on the rear of the truck .if you locate the wiring harness going to pump you will see groud wiring leading off harness to frame rail, make sure that is good also you can try to move wiring while someone is trying to start engine to see if it is a wiring problem,

If it turns out to be wiring to pump there is a replacement connector sold to rewire fuel pump connector, start with these tests and will go from there. good day.

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My truck started to sputter down the highway I pulled over it died it wont start. I changed the fuel filter that didnt work it might be the fuel pump or could it be a fuse?


You can get a wiring diagram and a fusebox layout for free at Autozone.com. Just register your truck for free on their site. Check the relay and fuses first before doing anything else.

If you have or can borrow a scanner, it would diagnose something like this.

I know someone who replaced a fuelpump and the old one was fine. There is a ground wire for the fuel pump that is part of the wiring harness. It needs to be connected into the harness so it can toggle on/off as part of the ignition switch and fuel pump relay. Do not bypass by making a different ground to the frame.

For some reason, between the connector under the hood and the plug into the fuelpump, this wire can break. You do not have to tear up the harness. Just run a new wire parallel to the harness and put new ends on the substitute wire and plug into the old connector.

I hope my solution is helpful.

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a couple of quick tests is to check the fuel pump fuse in the fuse panel,if the fuse is good then while you have someone try to start the car have someone hit the gas tank,if the fuel pump starts and the car starts then you need a fuel pump.you don`t say what year this is so I will assume that it is fuel injected,you can also try to find a single green wire under the hood along the firewall usually it has a brown plastic connector taped to the wiring harness.jumper a wire from the battery to this wire and the fuel pump should work or make a noise this is a direct feed power wire to the fuel pump for this purpose,you also could have a bad connection at the fuel pump itself,the fuel pump is in the gas tank

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My fuse for the fuel pump keeps blowing. the fuel pump was replaced. it was intermitant now as soon as you put the fuse in it pops. Short in the wiring somewhere?


When the fuel pump is replaced, often the correct wiring harness needs to be spliced in. The original wiring harness was more than likely reused. It is very possible the wiring harness is the cause for the short. Other than that, check where the wires go from the fuel pump wiring harness to the connection to where they go back inside the car. Corrosion is often another problem.

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My 1994 bronco fuel pump is not working, is there a relay i should check first before removing the fuel pump?


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I just replaced the fuel pump again, it engaged and pump worked, once! what could cause this? any relays or fuses to look at?


It's common for the wire harness from the pump to the frame to go bad when the fuel pump is replaced. The harness is around $15.00 and should be replaced the same time the fuel pump is replaced. If you can get to the wire harness to move it around and see if the fuel pump would start to work, then you know it's the wire harness and you can also disconnect the wire harness at the frame to check for 12v. Food for thought also, was the fuel filter replaced shortly after the fuel pump??? It may have picked up dirt that got in the gas tank and is not to dirty to let fuel flow through. Good luck and keep me posted.

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NO but you can buy a new wire harness and i think it goes for around $15.00. It's common to replace the wire harness the same time you replace the fuel pump since they will have the same amount of corrosion. Good luck and hope this helps. 

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Sounds like you have two sensors out: the speedometer sensor and the fuel gauge sensor. Good news:These are annoying problems, but of course they aren't damaging the vehicle.Bad news: They are costly sensors and no easy job for the shade tree mechanic. You might want to check and see if someone will do it cheaper and try providing your own parts~ mechanic supplied parts usually are more expensive than what you buy at Auto Zone. Bear in mind that the mechanic may refuse to guarantee the work unless you pay his price for parts~ so check on that in advance.

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