Question about 1991 GMC Sonoma

2 Answers

I Have a 1991 GMC sonoma turning a corner it just quit. The fuel pump is turning on but looking at the TBI I am not getting any fuel in. Fires when gas is sprayed in the TBI. Fuel filter was changed as a easy fix but no luck.

Posted by house2homere on

  • 2 more comments 
  • house2homere Feb 10, 2011

    Yes I have 3/4 of a tank. First thing I looked at at the time. My guage should not be off that much. The pump was changed out 3 years ago. Going to look at the pressure it is putting out in the am. I was hoping it was not the pump as is a ***** to change. Will let you know. Thanks

  • house2homere Feb 12, 2011

    Got it was the fuel pump. Looks as if the place that put in the last pump 3 years ago did not change the filter at the pump and it fell apart and bits got sucked into the pump. It was the original filter from 91. If you want things done right you have to do them your self. I swapped out the whole fuel unit. I think we r good for an other 457k. Thanks for your help

  • house2homere Feb 12, 2011

    Thanks for your direction in getting my truck back on the road during these tough times.

  • Carlos Osorio
    Carlos Osorio Oct 03, 2012

    I have GMC sonona and I have a problem with start, when is cold the truck turn on but 5 a 10 minute the truck turn off automatic and i already changed the fuel filter and I already testing the fuel pump and be okay, so i dont was the problem, somebody can tell me was problem, thanks

×

Ad

2 Answers

Azrael SRL

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • GMC Master
  • 11,800 Answers

Simple test to find out if the pump has failed: remove the fuel filter and put the contact - if the fuel doesn't squirts out in force then you will know for sure that you need a new one.

Posted on Feb 10, 2011

Ad

Dcramer531

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    President:

    An expert whose answer got voted for 500 times.

  • Master
  • 1,654 Answers

2 things emediatly come to mind. forgive me but I have to ask, are you sure there is gas in the tank? turning a corner will draw fuel away from the pump if the tank is too low. If fuel is in the tank then your pump is more than likey dead. It may turn on and run but the diagphram is bad and there for not pumping. You can try an inline fuel pump to see if it runs with the aux pump.

Posted on Feb 10, 2011

  • 1 more comment 
  • Dcramer531
    Dcramer531 Feb 10, 2011

    I rmembered that the oil pressure switch must be working on this as well, or no pump, so if the pump is running I suspect the pressure switch is good, but I can't garantee it just yet.

  • Dcramer531
    Dcramer531 Feb 11, 2011

    The fuel gauges are sometimes in the pumps on newer models, I am not sure of the one you purchased, but it could also be giving you false readings.

  • Dcramer531
    Dcramer531 Feb 13, 2011

    I am glad your back on the road, this pumps are not a fun change, but the good new is you should not have to woryy about for quite a while. If your happy with my direction a vote of approval would sure be appreciated, and thanks for using Fix ya

×

Ad

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

2.8l. How do I disassemble the fuse panel?


GMC Sonoma Maintenance & Repair Questions - CarGurus

www.cargurus.com > Questions > GMC > Sonoma

CarGurusGet fast answers to your GMC Sonoma Maintenance & Repair questions from experts in the CarGurus ... My 1999 Gmc Sonoma 4.3 Will Start But Will Stay Running ...1991 gmc sonoma 2.8 l v6 changed everything in the fuel and ignition system except for the ... Why Is The Engien Dying When The Ecm-batt Fuse Burns Out?

can you bypass the fuel pump relay on a 1997 gmc sonoma

www.cargurus.com > Questions > GMC > Sonoma

CarGurusAug 7, 2014 - can you bypass the fuel pump relay on a 1997 gmc sonoma - I have no power at the pump. can i run a new positive lead from the fuse box straight to the pump... ... Question type: Maintenance & Repair ... 1991 gmc sonoma 2.8 l v6 changed everything in the fuel and ignition system except for the spark ...

GMC Sonoma Questions - wiring diagram for a 1995 gmc ...

images for 1991 chevy s10 wiring

Dec 12, 2015 | 1991 GMC Sonoma

2 Answers

(1991 Sonoma 2.8L) I can watch the injectors run out of gas as the pressure drops, but how can I tell what is causing this? So far I have checked voltage at the pump (good), replaced the filter (new), I...


The ground wire for the fuel pump is separate from the wire harness and may need to be re-grounded. (Common thing to happen) The only other thing you can do is try replacing the the fuel pump relay or the fuel pump it self if it's weak. Believe the fuel pressure for your TBI system is 13 to 14.5 PSI to have your engine run 100%.
Good luck and recheck you wire harness and ground lead wire. Thank you for using Fixya

Mar 17, 2010 | 1991 GMC Sonoma

1 Answer

Gmc sonoma 4.3 1991 rough start up occasionally


check to see if your egr vave is sticking. if so you will need to replace it.

Feb 11, 2010 | 1991 GMC Sonoma

1 Answer

Where is the fuel pump relay for a 1991 gmc jimmy?


  • HOME bc_arrowbullet1.gif
  • REPAIR INFO bc_arrowbullet1.gif
  • COMPONENT LOCATIONS bc_arrowbullet1.gif
  • COMPONENT LOCATIONS RESULTS
Relay - Fuel Pump 1991 GMC Truck S15 Jimmy 2WD 4.3L TBI 6cyl The Relay - Fuel Pump Under hood, driver side, upper firewall, mounted in relay block

Jul 02, 2009 | 1991 GMC S-15 Jimmy

1 Answer

FUEL PUMP DRAINING FUEL BACK INTO TANK WHEN ENGINE IS SHUT OFF


The fuel is in a continous loop being available at  all times to the TBFI. It has the return path so it can always return to the tank via the return line. Np check valve as the pump runs all the time.

Jan 07, 2009 | 1991 GMC S-15 Jimmy

1 Answer

Fuel pump not getting power


i am replacing the pump with a high flow in line pump we will se how this goes it has a return line i am running the power from the fuel pump relay to the back of the tbi 99 gmc sonoma

Jul 30, 2008 | 1999 GMC Sonoma

Not finding what you are looking for?
1991 GMC Sonoma Logo

Related Topics:

204 people viewed this question

Ask a Question

Usually answered in minutes!

Top GMC Experts

Marvin
Marvin

Level 3 Expert

85239 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22485 Answers

Jeffrey Turcotte
Jeffrey Turcotte

Level 3 Expert

8984 Answers

Are you a GMC Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...