I have a 1998 GMC K1500, will not start until I pour fuel down throttle body, after that truck will run fine until it sits for about 4 hours, then will not start again, any idea?

55

Asked by Jan 11, 2014 at 11:33 AM about the 1998 GMC Sierra 1500 K1500 SL 4WD Extended Cab LB

Question type: Maintenance & Repair

I have a 1998 GMC K1500, will not start until I pour fuel down throttle body, after that truck will run fine until it sits for about 4 hours, then will not start again, any idea? Once truck has been started I can drive and shut off and start no problem, once truck sits for about 4 hours or more it will not start unless I pour more fuel down throttle body. Turn key on and you can hear fuel pump running/humming, fuel pressure was between 52psi and 58psi when turning key on.

6 Answers

116,635

Is it a vortex engine?

8 of 8 people found this helpful.
55

No it is a 5.7l

4 of 4 people found this helpful.

did you check your fuel pump?

815

IF ITS A 1998 GMC OR CHEVY IT IS A VORTEC ENGINE WHETHER VORTEC V6 OR V8 AND POURING GAS IN THE THROTTLE BODY WILL ONLY START A FIRE EVENTUALLY BECAUSE IT'S FUEL INJECTION AND THE ANSWER YOU SEEK IS IN THE FUEL TANK..GO CHECK THE FUEL PUMP GROUND WHICH SHOULD BE HOOKED UP TO THE FRAMEWELL BEHIND THE DRIVERSIDE REAR WHEEL..IT MAY BE BROKEN .....OPEN THE FUEL DOOR, REMOVE THE GAS CAP, HAVE SOMEONE TURN ON THE IGNITION AND LISTEN FOR A HUMMING SOUND..IF YOU DONT HEAR IT CHECK FOR BROKEN WIRES AND IF NOTHING IS BROKEN YOU NEED A FUEL PUMP BUT IF YOU HEAR THE HUMMING HAVE YOUR FUEL PRESSURE CHECKED

4 of 4 people found this helpful.

How did you fix this problem?? Im having the same exact problem

55

I did have the humming when turning the key on, and the fuel pump pressure (Key on or Running) was in specs. However I did change the fuel pump after checking all other wires and that did take care of the problem, More than likely it you end up changing your fuel pump you could end up having to change brake lines and fuel lines due to rust.

1 of 1 people found this helpful.

Your Answer

Sierra 1500

Looking for a Used Sierra 1500 in your area?

CarGurus has 64,433 nationwide Sierra 1500 listings starting at $999.

ZIP:

GMC Sierra 1500 Experts

  • #1
    dragonflyoffshore
    Reputation
    5,470
  • #2
    John Saffrahn
    Reputation
    3,780
  • #3
    Glenn Clingenpeel
    Reputation
    3,470
View All

Related Models For Sale

Used Chevrolet Silverado 1500
2,655 Great Deals out of 173,892 listings starting at $955
Used Ford F-150
3,192 Great Deals out of 223,470 listings starting at $1,200
Used Dodge Ram 1500
420 Great Deals out of 11,094 listings starting at $950
Used Toyota Tacoma
684 Great Deals out of 45,125 listings starting at $2,500
Used GMC Yukon
601 Great Deals out of 20,287 listings starting at $2,500
Used Chevrolet Tahoe
792 Great Deals out of 41,774 listings starting at $1,987
Used Ford F-250 Super Duty
430 Great Deals out of 48,942 listings starting at $1,899
Used Cadillac Escalade
276 Great Deals out of 11,735 listings starting at $1,200
Used Chevrolet Camaro
440 Great Deals out of 31,642 listings starting at $1,450

Used Cars For Sale

2018 GMC Sierra 1500 For Sale
3 Great Deals out of 26,329 listings starting at $23,419
2017 GMC Sierra 1500 For Sale
78 Great Deals out of 10,490 listings starting at $20,369
2016 GMC Sierra 1500 For Sale
161 Great Deals out of 4,073 listings starting at $16,404
2015 GMC Sierra 1500 For Sale
188 Great Deals out of 5,624 listings starting at $14,995
2014 GMC Sierra 1500 For Sale
222 Great Deals out of 4,989 listings starting at $9,900

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.