My 1991 gmc sierra all of a sudden died at a stop sign and now won't start. Turns over but won't start

Asked by May 12, 2015 at 04:36 PM about the 1991 GMC Sierra 2500 2 Dr C2500 Standard Cab LB

Question type: Maintenance & Repair

2 Answers


Most common is a fuel pump failure. but there are also others. Check for blown fuses first. Do you hear a fuel pump running when you just turn the key to on? It will only run a few seconds, if it does run then check for spark and injector pulse. If it don't then replace the fuel pump assembly and filters. Check the fuel pump connector, if the fuel pump assembly comes with a new one, use it. These are known failures.


For the GM TBI engines the ICM (Ignition control module) located in the distributor has a higher failure rate. It is cheaper and easier to replace verses the fuel pump. When the ICM dies or the pick-up coil fails you will not have spark or fuel (the computer cannot see RPM and does not fire the injectors) if the pump is weak or completely failed you will have spark but no fuel spraying. But before we get to deep when is the last time the fuel filter was changed, if it's not spraying fuel check that first. It is on the inside frame rail, drivers side. Ensure you use line wrenches as regular open wrenches will most likely round the tube fittings.

Your Answer

GMC Sierra 2500 Experts

  • #1
  • #2
  • #3
View All

Related Models For Sale

Used GMC Sierra 1500
908 Great Deals out of 59,399 listings starting at $1,980
Used Ford F-150
2,535 Great Deals out of 221,934 listings starting at $1,222
Used Ford F-250
418 listings starting at $4,533
Used GMC Sierra 3500
221 listings starting at $8,995
Used Chevrolet C/K 2500
200 listings starting at $3,495

Used Cars For Sale

2004 GMC Sierra 2500 For Sale
39 listings starting at $5,795
2001 GMC Sierra 2500 For Sale
11 listings starting at $4,700
2000 GMC Sierra 2500 For Sale
26 listings starting at $10,999

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.