94 GMC Sonoma fuel problem

10

Asked by Jan 29, 2017 at 06:37 PM about the 1994 GMC Sonoma 2 Dr SLS Standard Cab SB

Question type: Maintenance & Repair

I have a 94 GMC Sonoma with a 4.3 TBI.
When I turn the key on the fuel pump doesn't
prime. It is not getting a signal from ECM to
relay. There is a test wire under the hood I
can hook to the battery and the fuel pump
comes on but then the injector won't come
on so I can spray starting fluid in the throttle
body and they will come on and the truck
will stay running and I can unplug the test
wire to fuel pump and the fuel pump stays
on. I have changed ECM and relay in the
dash still the same problem.

4 Answers

2,305

so after priming the fuel with a jump wire you still have to dump starting fluid to get it to run , trace the circuit back , maybe it's goes through a pressure sensor , you should test the injector to see whether it's working or not and some motors need a correct fuel pressure to run not a "charge " if it was fun everyone would do it

10

I plugged a noid light into the injector and it wasn't pulsing. I have changed the fuel pump twice since this has started happening if I start it and run it like that the fuel pump will burn up after a couple months in my manual it says the relay is only for starting then the relay turns off and it runs off of the oil pressure. I haven't been able to find a diagram online.and is the oil pressure sending unit the oil pressure switch

1 of 1 people found this helpful.
10

I changed the oil pressure switch still having same problem does anyone have any other ideas

2,305

if that injector is not pulsing I'd say that is your problem

Your Answer

Sonoma

Looking for a Used Sonoma in your area?

CarGurus has 438 nationwide Sonoma listings starting at $1,000.

ZIP:

GMC Sonoma Experts

  • #1
    parkle
    Reputation
    680
  • #2
    Mike Bonnell
    Reputation
    480
  • #3
    James Mayfield
    Reputation
    320
View All

Related Models For Sale

Used Chevrolet S-10
6 Great Deals out of 1,205 listings starting at $2,500
Used Ford Ranger
170 Great Deals out of 5,554 listings starting at $1,499
Used Ford F-150
2,325 Great Deals out of 184,534 listings starting at $699
Used Toyota Tacoma
632 Great Deals out of 43,272 listings starting at $1,500
Used GMC Sierra 1500
888 Great Deals out of 65,682 listings starting at $1,995
Used Dodge Dakota
123 Great Deals out of 3,756 listings starting at $1,700
Used Dodge Ram 1500
362 Great Deals out of 10,960 listings starting at $1,500
Used Jeep Wrangler
305 Great Deals out of 16,323 listings starting at $2,500

Used Cars For Sale

2003 GMC Sonoma For Sale
4 Great Deals out of 109 listings starting at $2,500
2002 GMC Sonoma For Sale
73 listings starting at $3,450
2001 GMC Sonoma For Sale
62 listings starting at $2,800
1999 GMC Sonoma For Sale
22 listings starting at $1,950

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.