Question about 1998 GMC Sierra

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What should the fuel pump pressure be on 98 gmc sierra 5.7 Having starting issues and miss when it does start

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: 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

Posted on Jul 25, 2008

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SOURCE: 2005 GMC Sierra Overheating

If your sure there is no trapped air in system after refill and air bleed off, is fan clutch pulling good air thru radiator? Even if it is, the heater should have coolant as hot as what temp gage is showing! Try backwards flushing heater core (dex cool is notorious for plugging these up). There is a TSB for cracked cylinder heads from GM for unexplained coolant loss.Remove drivers side valve cover, and look at center three head bolts for coolant around them, if coolant has been getting in thru this suspect area, there will be a milky/pudding like goo under valve cover and on head. GM had a company called Castec cast these and the areas near the head bolts were found to be too porous (NO recall YET!) Ya, you guessed it, replace heads! Unfortunately, if its gotten hot to many times, it has probably hurt the heads/gaskets. Hope this helps. PS: The castec logo is under the rearmost pair of rocker arms,may have to remove them to see.

Posted on Feb 05, 2009

dennymulford
  • 1055 Answers

SOURCE: 1998 GMC Sierra- runs rough then stalls when

had this problem on my neighbors 98 chevy truck with the same engine !!
it turnd out too be the fuel pressure regulator,you have too pull the upper intake too replace it!!

Posted on Jun 06, 2009

  • 10 Answers

SOURCE: fuel pump fuse located on 1997 gmc sierra

The fuse is actually a Relay Switch and its located in the Fuse Relay Center on the driverside of the engine compartment. The Black Box is labled Fuse Relay Center, the diagram on the cap displays which Relay is the Fuel Pump relay...the Relay switch is usually $8-$15 depending on where you shop

Posted on Jul 28, 2009

  • 13 Answers

SOURCE: fuel pump- 2002 GMC Sierra

The fuel sending unit only controls the gas guage not the fuel supply to the vehicle. The pump is twelve volts. If you are not getting twelve volts on the PUMP wires check the fuel pump relay and the key circuit to it. If you have to cycle the key three to four times rapidly to get the vehicle to start check the fuel pump pressure at the regulator for manufacturer specs. An injector stuck open will also cause same problems you are describing.

Posted on Jul 30, 2009

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98 gmc sonoma not starting


If it is not starting and bogs down on the road, I would check the fuel pressure and replace the filter next.

Sep 06, 2012 | 1998 GMC Sierra

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I have a 2002 GMC Sierra 1500 8 cylinder 5.3l truck. I have had issues with it starting, the fuel pump would not function. I had been able to remove the relay and replace and it would start from time to...


Check connections at/or replace oil pressure switch. Your oil pressure switch is also a safety feature that shuts off power to fuel pump in case of accident or rollover.

Mar 12, 2011 | 2002 GMC Sierra 1500

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I have a 1989 GMC sierra 4.3 Liter, fuel pressure


u can do the check the other way around/ disconnect the fuel line that supply the injectors/ put the pipe in a small plastic container to see if fuel is being supplied by the pump and avoid fuel spill in ur engine/ crank the engine for at least 5 seconds see if the fuel squirts with pressure/ if it does then ur fuel pump is ok / blockage is somewhere down the fuel line/ u can check fuel lines by blowing it with air but u gonna need the help of an air compressor.....

Apr 09, 2010 | 1989 GMC Sierra

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1998 GMC Sierra- runs rough then stalls when


had this problem on my neighbors 98 chevy truck with the same engine !!
it turnd out too be the fuel pressure regulator,you have too pull the upper intake too replace it!!

Jun 04, 2009 | 1998 GMC Sierra

2 Answers

98 GMC 4X4 won't start


replace throttle body injector

Jun 02, 2009 | 1998 GMC Sierra

1 Answer

Our 2002 gmc sierra 4x4 truck stopped while we were driving. Is there a fuel shut off switch somewhere that might have been engaged?


If its fuel related, it is most likely the fuel pump inside your tank. You can listen for it by having someone turn the key to on (not start) while you listen by the fuel tank. You should hear a buzzing sound for about 5 seconds. That means the pump is turning but is not really a good indication of pump pressure.
If you don't hear the pump run, I would check power to the pump first before you buy one. I think the whole tank unit is about $150.
Good luck

Jan 18, 2009 | 2002 GMC Sierra

4 Answers

1997 gmc sierra shuts off while driving


Had same problem with a Yukon. Turned out to be a bad fuel pump (Won't show codes.) When cold ran fine, heated up, no pressure. Would start after sitting for about 1/2 hour. When engine dies on you check for fuel pressure under the hood.

Jan 07, 2009 | 1997 GMC Sierra

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