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

7,485

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 people found this helpful.
10

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

7,485

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 272 nationwide Sonoma listings starting at $2,900.

ZIP:

GMC Sonoma Experts

  • #1
    parkle
    Reputation
    790
  • #2
    Mike Bonnell
    Reputation
    510
  • #3
    James Mayfield
    Reputation
    320
View All

Related Models For Sale

Used Chevrolet S-10
5 Great Deals out of 908 listings starting at $1,700
Used Ford Ranger
120 Great Deals out of 4,253 listings starting at $995
Used GMC Sierra 1500
702 Great Deals out of 56,641 listings starting at $1,500
Used Toyota Tacoma
470 Great Deals out of 50,658 listings starting at $2,850
Used Ford F-150
2,281 Great Deals out of 188,639 listings starting at $1,200
Used Dodge Ram 1500
330 Great Deals out of 8,923 listings starting at $1,950
Used Dodge Dakota
90 Great Deals out of 2,990 listings starting at $1,200
Used Chevrolet Camaro
314 Great Deals out of 27,184 listings starting at $2,700
Used Chrysler Sebring
17 Great Deals out of 1,922 listings starting at $950

Used Cars For Sale

2003 GMC Sonoma For Sale
64 listings starting at $2,900
2002 GMC Sonoma For Sale
61 listings starting at $2,995
2001 GMC Sonoma For Sale
43 listings starting at $2,995
2000 GMC Sonoma For Sale
36 listings starting at $4,481
1999 GMC Sonoma For Sale
14 listings starting at $4,500

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.