I installed a fuel pump on my 2002 GMC Sonome engine 4 cyl. It started righd not startet up. But, after driven 2 miles, stalled out and died. Since then I could start only after taking out pump out of tank and reinstalled. Oil pressure is more than 40 PSI. I can not find any voltage from terminal.. I put a hotwire (jumper) from 87 terminal to 30 Terminal in fuel pump relay terminal, still no juice. I put a wire from batter to straight to pump . The new pump made noise . Still could not start. In this morning I put a jumper from 87 terminal to pump. I managed the engine running. I could start without jumper about 5 times. While the engine running, I decided to take my truck to road test. Whiel the engine running, I was gathering some tools and equipment for in case of broke down, the engine shut off. Why does my truck do this? I need help, please.

Asked by hanbsh May 08, 2014 at 11:36 AM about the 2002 GMC Sonoma SL 2WD

Question type: Maintenance & Repair

I installed a fuel pump on my 2002 GMC Sonome engine 4 cyl. It started righd not startet up. But, after driven 2 miles, stalled out and died. Since then I could start only after taking out pump out of tank and reinstalled. Oil pressure is more than 40 PSI. I can not find any voltage from terminal.. I put a hotwire (jumper) from 87 terminal to 30 Terminal in fuel pump relay terminal, still no juice. I put a wire from batter to straight to pump . The new pump made noise . Still could not start. In this morning I put a jumper from 87 terminal to pump. I managed the engine running. I could start without jumper about 5 times. While the engine running, I decided to take my truck to road test. Whiel the engine running, I was gathering some tools and equipment for in case of broke down, the engine shut off. Why does my truck do this? I need help, please.

2 Answers

40

My friend has 1999 Sonoma with a similar problem. We have been trying fix what we thought was a bad fuel pump but when we removed the pump and reconnected it outside the tank it worked good for 2-3 seconds until the relay timed out. Then we reinstalled the pump in the tank and the truck started up with no problem and ran for a few miles and stalled the next day with the same symptoms. We get voltage in and out of the fuel pump relay but maybe no voltage to the pump. It took many hours to drop the tank and reinstall it in the garage with floor jacks so we don't want to do that again just to test the voltage at the wire harness connectors on top of the fuel tank. It is also a lot of work to remove the bed so how did you test the voltage at the fuel pump? Did you test it at the test jumper between the relay and the pump? Which wire at the test plug is the pump wire and which is the fuel gauge wire? Maybe the wire harness is bad? Other online forums suggested the problem could be a loose ground wire behind the bed but there are several plugs back there and i don't know which one is for the fuel pump or tank ground.

4 people found this helpful.
45

check the oil pressure sensor,

2 people found this helpful.

Your Answer:

GMC Sonoma Experts

  • #1
    parkle
    Reputation
    940
  • #2
    Mike Bonnell
    Reputation
    550
  • #3
    James Mayfield
    Reputation
    350
View All

Find great deals from top-rated dealersTM

Search

Related Models For Sale

Used Chevrolet S-10
589 listings starting at $1,995
Used Ford Ranger
164 Great Deals out of 37,053 listings starting at $1,250
Used GMC Sierra 1500
1,480 Great Deals out of 61,695 listings starting at $1,500
Used Toyota Tacoma
830 Great Deals out of 50,449 listings starting at $3,000
Used Chevrolet Silverado 1500
3,817 Great Deals out of 154,463 listings starting at $1,500
Used Chevrolet Blazer
28 Great Deals out of 26,516 listings starting at $950
Used Dodge Dakota
54 Great Deals out of 1,872 listings starting at $1,600
Used Nissan Frontier
650 Great Deals out of 25,719 listings starting at $1,991
Used Dodge RAM 1500
276 Great Deals out of 6,792 listings starting at $499
Used Ford F-150
4,086 Great Deals out of 247,257 listings starting at $750
Used Toyota Tundra
758 Great Deals out of 37,436 listings starting at $1,300

Used Cars For Sale

2003 GMC Sonoma SL 2WD For Sale
1 listings starting at $5,450

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. Content will be removed if CarGurus becomes aware that it violates our policies.