Question about GMC Sierra 1500

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  • scooterg822 Feb 15, 2009

    changed relay in fuse box under hood.Took air cleaner hose off sprayed starting fluid down it,started then died

  • Dennis Mulford
    Dennis Mulford May 11, 2010

    need more info

  • Todd Bradshaw
    Todd Bradshaw May 11, 2010

    what do mean when you say gas changed relay ?



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Hello there is a fuse also in the fuse box and there is a relay driver side under fuel tank area !98 GMC TRUCK DOSE NOT HAVE GAS CHANGED RELAY CAN'T - 78402599

Posted on Feb 15, 2009


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2001 gmc sierra 1500 injector fuses and relays

Do you hear the fuel pump running on the prime cycle (when you turn on the key) (runs for 3 seconds) or when you have oil pressure?Have someone listen back by the tank for the wrrrrr.If you do have to change the fuel pump,make your life easy and just tilt up (lift) the pickup box from the drivers side to access the fuel pump.Takes 20 minutes to change it that way.

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My son has a 2000 gmc sierra.. the truck was running often low on gas and when he recently turned the truck off whenever you attempt to start the truck when u turn the key over it blows the ecm-b fuse. ...

That fuse powers several things, including the fuel pump relay.
You would need to disconnect the harness at the pump and see if the fuse still blows.

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in fuse box the fuse that works fuel pump is ecm bat fuse this fuse works fuel ,ignition it has fuel pump relay

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My truck wont start. I changed the battery and fuel pump. what could be the problem

Check your fuel pump relay in the fuse box under the hood located next to your battery. same thing happened to my 98 grand Cherokee. if you turn on the key and you don't hear your fuel pump then the relay is bad and needs replacing.

Dec 11, 2010 | 1998 Jeep Grand Cherokee

1 Answer

98 GMC k 1500 pickup. I can hear my fuel pump whine when I turn my key on , start my truck but it dies after a second or so. Just replaced my fuel filter still the same.Any clue why it won't stay running

have you tried the fuel pump relay, the relay coil may be overheating and dropping out. Or there is **** in the pump filter at the tank end if it has one on the lift pump end itself (i.e. in-tank filter)

Jan 16, 2010 | GMC K1500 Cars & Trucks

3 Answers

99 yukon 180,000 mi. doesn't start. cranks forever, but won't start. Should I be able to hear the fuel pump when I turn on the key?

yes you should be able to hear the fuel pump run for about 5 seconds once the key is turned to the on pos. check to make sure you have spark. if you do try having someone spray air intake or carb cleaner into intake manifold while you crank. If the truck starts right up for a second (or stays running as you keep spraying) Id say you have a bad fuel pump and id change the sending unit also. (First check the fuel pump fuse and fuel pump relay) GMC and Chevy are nororiously known for having bad fuel pump/sending unit problems. I have prob changed over 60 myself.

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2 Answers

Have a 98 gmc 5.7 truck have to prime to start truck.

Sounds to me like either your pressure regulator is bad or you have a loose fitting somewhere in the fuel line from the fuel pump to the engine. When you turn your key to the on position, you should hear the whine of the fuel pump until it builds pressure. When you shut the truck off the pressure regulator should retain the pressure for a certain amount of time but if it don't close then air is allowed into the fuel line and the fuel drains down to fuel line away from the engine. Next time you try and start the truck after it has sat for a while try turning the key on until you hear the fuel pump whine shut off, then repeat it 3-5 times and then try to start it. Basically that is running the pump enough to get the fuel back up to the injectors. Check for loose fittings in the fuel line, or cracks in the fuel line and if all that is fine then replace the regulator.

Hope that helps

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1 Answer

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The inline fuel pump fuse on the passenger side firewall is good? Are you jumping it with 12 volts at the test lead or the fuse?

Jun 26, 2009 | 1987 GMC V1500

2 Answers

Fuel pump problem

replace the fuel pump relay. in the underhood fuse/relay box in front of the master cylinder.

May 06, 2009 | 1998 GMC Sonoma

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