94 GMC Sonoma fuel problem

20

Asked by Landon4231 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.

5 Answers

40,015

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

20

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 people found this helpful.
20

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

did you ever figure out what is causing this issue? i have the same thing going on with my 94 sonoma

Your Answer:

Sonoma

Looking for a Used Sonoma in your area?

CarGurus has thousands of nationwide listings and the tools to find you a great deal.

Postal Code:

CarGurus Experts

  • #1
    parkle
    Reputation
    1,090
  • #2
    Mike Bonnell
    Reputation
    660
  • #3
    James Mayfield
    Reputation
    410
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used Chevrolet S-10
3 listings starting at $12,975
Used Ford Ranger
18 Great Deals out of 1,529 listings starting at $2,888
Used Toyota Tacoma
55 Great Deals out of 1,071 listings starting at $8,708
Used GMC Yukon
16 Great Deals out of 929 listings starting at $1,225

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.