Question about 1998 GMC Suburban

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No power to fuel pump in a 98 gmc sub.

Have replaced pump and harness has power untill it reaches new harness wires

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Bad connection hook up

Posted on Feb 27, 2009

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2000 chevy truck 3500 check wiring on fuel pump harness


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Applications: 2000-97 CHEVROLET/GMC C, K 1, 2, 3 TRUCK 262... Please check out our 'How to Install New GM Wire Harness onFuel Pump ...


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For fuel pump on 2000 chevy truck 3500 need to check wiring on the harness


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1 Answer

Electrical problem for the fuel no power


A lot of newer vehicles have a fuel pump cutout switch on the engine. If the engine shuts down for any abnormal reason, it loses oil pressure and one of the things that happens is the fuel pump is cutoff. This is a safety item in case of an accident which shuts off the engine. Check for the oil pressure cutout switch on the engine, which is usually different from the oil pressure gauge or light switch. Can't say exactly where it is, sometimes on the upper rear part of the engine behind intake manifold or on lower side of engine right into the block. The fuel pump run circuit is different from the fuel gauge circuit although they usually run in the same wiring harness if the fuel pump is in the tank. If the pump is not in the tank then the fuel level sender in the tank is probably defective and should be replaced.

May 12, 2013 | 2001 GMC Savana

2 Answers

Im working on a gmc 3500 fuel pump the wireing harness is differnt please help asap its raining and dark with lights please talk to me its a box truck colors are all differnt then then the original wire...


you should be able to disconnect the fuel pump at the harness plug above the tank (under the cab, above the frame) and then reconnect the new pump.

Jan 12, 2013 | Cars & Trucks

2 Answers

Put in new fuel pump bout 7 months ago now it seems bad again this is 3rd fuel pump van has had since 98 any ideas what could make these keep going out it starts one day then after sittin all night it wont...


put in a factory pump with updated wiring harness as a replacement on these always. check power and groun while its acting up to make sure its the pump

Aug 22, 2010 | 1998 GMC Safari

2 Answers

No fuel delivery to eng., no voltage spurratic


Oil pressure switch activates the supply pump. Replace the oil pressure switch.. New & Need good rating please.

Jul 31, 2010 | 1998 GMC Jimmy

1 Answer

I was driving my 98 GMC Suburban and all of a suden the engine died. I tried to start it but it wouldn't start. I turned the key to listen for the fuel pump and it sounds normal as it was pumping. What...


If no fuel is getting to the injectors replace the fuel pump relay. The engine oil sensor has a 3rd wire that sends the signal to prime the pump as you may know. When the oil pressure is reached to the normal range the computer shuts off that circuit to the oil sensor and turns on the relay to the fuel pump

Jun 30, 2010 | 1998 GMC Suburban

2 Answers

Is there an access door any where to replace the fuel pump in my 98 gmc jimmy


I do not think so. Look above the fuel tank to make sure but I believe you will have to remove the fuel tank in order to replace the pump. Be sure and replace the fuel filter at the same time. Partially clogged fuel filters are the main cause of fuel pump failure.

Dec 09, 2009 | 1998 GMC Jimmy

1 Answer

We are replacing the fuel filter in a 98 pontiac transport. The new wiring harness came with a purple, grey & 2 Black wires. The OE harness comes with purple, grey , black and a white/black. How do you...


Assuming you mean replacing the fuel PUMP, the 2 wires are different guages. Connect the lighter wire to the lighter wire and the heavier wire to the heavier wire. If the new harness uses both the same size wires, the heavier wire on the vehicle side (solid black) is for the fuel pump ground. Lighter wire is for fuel guage sending unit.

Sep 21, 2009 | 1997 Pontiac Trans Sport

1 Answer

Electric Fuel Pump on an '98 Sierra


when mine went bad I pulled the bed off and moved it back enough toget to the top of the fuel tank it was easier to remove and replace versus dropping the tank tookme and my buddy about 2 hours rig a sling and use a cherry picker to lift bed don't forget to unplug wire harness hope this helps

Jul 16, 2008 | 1998 GMC Sierra

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