Question about 1985 GMC S-15

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1985 gmc sonoma fuel delivery issue

I need to know what the pump should ohm out at so i can decide if the pump itself is ok. Also what the voltage should be like in the two wires coming to the pump

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You can check a new pump for resistance. You should have a power and ground wire, the power side would be battery voltage when the relay is engaged.

Posted on Jan 23, 2013


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Posted on Jan 02, 2017

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SOURCE: 1996 Gmc sonoma

there could be several possibilities, first did you change the fuel filter? most often times a partially plugged fuel filter will cause the sputtering. plugged fuel filters generally lead to the failure of the fuel pump. if you have a fuel injected vehicle the injector themselves can fail, this happens often especially if regular maintenance doesn't happen. i always use an injector cleaner additive when i fill up each time. a common symptom of sputtering is a plugged catalayic converter. the engine needs to breath to run right. also check the airfilter this is important for the engine to breath as well as proper fuel air mixture. if the engine senses a loss of power due to low fuel air mixture it will try to pump more fuel then it should therefore it's basically flooding itself. try these basic fixes first. if this doesn't solve the problem then post back with more detail and i will try a different approach.. please rate this thanks.

Posted on Oct 09, 2008

  • 231 Answers

SOURCE: 2001 GMC Sonoma Engine stopped while driving

sounds like it could be plugged injectors or a timing problem.

Posted on Oct 27, 2008

  • 71 Answers

SOURCE: where is the fuel shutoff switch on a 1996 gmc sonoma?

no fuel shut off switch on pickups that i know of possibly bad fuel pump find your red bypass wire at relay to test pump

Posted on Mar 29, 2009

  • 2309 Answers

SOURCE: 1999 gmc jimmy fuel gauge reads empty, pulled fuel

look for a short in the sending wiring, empty means the circuit is closed, open circuit full

Posted on Nov 28, 2009

  • 8404 Answers

SOURCE: How to change a fuel pump in a 1996 Gmc Sonoma

drop the tank ... use a brass punch to loosen the ring ... to find/replace the pump.

the relay is operated by the computer ...

Check for volts on the outgoing side of the relay ...

check for signal on the input side

check the pressure regulartor ...

If you are still interested ... there is lots more to this. If you are getting weak knees ... remember after you drop the tank and remove the fuel pump ... you are stuck

Posted on May 02, 2010

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1 Answer

Fuel pump is not getting any power on 1996 gmc sonoma

And the question is?

You need a wiring diagram & start testing for
open circuits,lack of grounds or voltage drops,
on the circuit your having issues with

Jun 03, 2012 | 1996 GMC Sonoma

1 Answer

Have replaced fuel pump in 2001 GMC Sonoma; truck does not start. Have located relay switch, how do I test it? thanks

just swap it with another relay in the box, also check the fuse panel in the pickup for blown fuses. Also when you turn the ignition switch on listen for the pump to come on if you do not hear it. Get an ohm meter and check the wiring at the pump for voltage going to the pump. If there is none start with the fuse box in the cab.

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1 Answer

I have a 1992 GMC Sonoma. I just changed the fuel pump and fuel filter and gas cap because every time I would drive it, the truck would stall would not start back up for a couple hours after...

If you can start the vehicle with carburetor cleaner, then yes you have a fuel delivery problem. To check fuel delivery, remove fuel line from fuel rail or carburetor and turn key to on. With the hose pointed into a gas can, you should see fuel pumping out of the line. If you have a camshaft driven fuel pump, then you will have to turn the starter motor to get the pump to work. If fuel is getting to this point, and the vehicle started earlier on carb cleaner, then you have clogged injectors. this may not be fuel related at all.
Check for spark by putting a plug onto one of your wires and ground the metal end of the plug . try to turn engine over. Should see a bright blue spark. Weak orange colored spark, or no spark at all indicates issues with distributor or coil. When doing spark check, be sure to have cleaned up any fuel that may have oversprayed from earlier testing.
An old trick to clear debris is to have one person cover the air intake while the engine is cranked by another person. Then quickly removing the hand that is covering the intake. 5 or 6 of those might clear out the trash.
If you have fuel, and you have spark, then timing may be a problem. get back with me and let me know what you find.

Nov 14, 2010 | 1992 GMC Sonoma

1 Answer

Fuel pump not coming on what is my first step to diagnosis problem on a 2002 gmc sonoma 4.3l

look for the fuel pump fuse and check it. If it is good , remove the fuse, turn on the ignition switch, take a voltmeter and ground the black lead to a good ground on the metal area surrounding it and take the red lead and check for voltage on either bare pin where the fuse was. One of them should read at least 12volts. If so, voltage will have to be checked at pump at the fuel tank.either no voltage at the pump due to loose connection at pump or, fuel pump is dead also could be a broken wire to the pump..hayne's manuals have a good outline for testing this procedure.

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1 Answer

Fuel pump fuse keeps popping

You have a short to ground or the pump is starting to go bad. You can run a seperate wire from the hot side of the fuse to your pump to see if it is the pump or if you use an ohm meter to check the wire and the pump. Get's a little technical though.

Jun 02, 2009 | 1996 GMC Sonoma

2 Answers

Gmc 94 sonoma

When was the last time the fuel filter was chg.? If thats not an issue best to get a fuel pressure test.

Apr 11, 2009 | 1994 GMC Sonoma

1 Answer

Where is the fuel shutoff switch on a 1996 gmc sonoma?

no fuel shut off switch on pickups that i know of possibly bad fuel pump find your red bypass wire at relay to test pump

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2001 gmc sonoma fuel pumpeplaced,ot starting now

check to see if you removed the fuel pump solenoid, which is one of the steps you should have done when changing the pump.

Jan 15, 2009 | 2001 GMC Sonoma Extended Cab

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