GM Truck Club
THE PREMIER CHEVY TRUCK & SUV FORUM
Founded in 2004 ~ We're the #1 Chevy Truck & SUV Forum.
Silverado & Sierra | Tahoe & Yukon | Suburban & Yukon XL | SUV & CROSSOVER
Page 1 of 2 12 Last Post byLast Post by
Results 1 to 10 of 12
  1. #1

    Default fuel delivery issue

    This seems like a very odd problem. I have a 93 K2500 5.7 burban. The issue i am having is. i will be driving down the road shortly after start up and it just dies. Has spark but no fuel coming from injectors was cranking. It i pour a little fuel down the throttle body i useally starts right back up. I am not sure what the deal is. There are no codes. Im not sure if it is possibly the TPS, IAC, MAP, ECM. New fuel pump 7 months ago. Fuel filter 2 months ago. Someone help plz

  2. #2
    Legend unplugged's Avatar
    Join Date
    Sep 2006
    Location
    High Deserts of SoCal
    Posts
    2,554

    Default

    Measure the pump pressure. TBI should be in a range of 9 - 13lbs psi. If the pressure is good, chances are the pump is OK. If not check the filter and then retest. If the pressure is still low, the pump may have crapped out. Other fuel delivery problems can be caused by a faulty gas cap, or obstruction in the fuel return line.
    There is no way to happiness....happiness is the way.:yipi:
    http://kx6ijq.blu.livefilestore.com/y1pcOFVNH4ix1hjyGUVyXK5LRfef7qSeWzlZDorpQhIEfkZ2ZA  _vXMYypuKMJFw671uF2ZPhjez_j-atRmcjM2zQKpQi1JSsB75/burb1.JPG
    High Desert SoCal
    93 K1500 burb (personal) 350 AT 3" Lift 250K+
    02 Honda Civic LX
    Looking for a 1990's Miata for an engine swap

  3. #3

    Default

    there is no shrader valve to check fuel pressure

  4. #4
    Former Member
    Join Date
    Oct 2007
    Location
    Huntsville, Alabama
    Posts
    372

    Default

    Also, check to make sure you dont have any junk in the gas tank. I got a fuel pump clogged up right after I replaced it b/c I got some junk in my gas tank...if that is the problem you may get lucky and it hasn't ruined the pump yet so you wont have to replace it.

  5. #5

    Default

    for starters i am sorry for not being more indepth with the issue here. Its my fault.
    Anyways....

    whats happiening is i will start it up everything is fine. Ill go anywhere from .25 to 10 miles from home. I will go to stop and it dies. Pour a bit of fuel down throttle body. I can keep it running with my foot on the gas. Sometimes when i let off it will die again other times it will keep running till it desides to shut down again. I replaced the MAP sensor this weekend. (There must of been a speical on them this weekend in my area. Had to go to 4 different autoplace stores to finally find one.) Seems to run a little bit better but still dies out. Unpluged the IAC so it would run in default but it is still dieing. I hope that this is a little bit more indepth. WOuld of wrote something sooner but i beleave the server was down all weekend.... Thanks in advance.....

  6. #6

    Default

    Quote Originally Posted by unplugged View Post
    Measure the pump pressure. TBI should be in a range of 9 - 13lbs psi. If the pressure is good, chances are the pump is OK. If not check the filter and then retest. If the pressure is still low, the pump may have crapped out. Other fuel delivery problems can be caused by a faulty gas cap, or obstruction in the fuel return line.
    I concur. Completely.

    Technology is great, when it Works,
    And one Big Pain in the Ass When it Doesn’t.
    Detroit Iron Rules, All the Rest are Just Toys.
    94 GMC Burban, 5.7L (350), 4X4, Auto
    86 GMC Burban, 350, 2 WD, Auto
    79 GMC pickup plow truck, 400, Full time 4X4, Auto
    86 Pontiac Fiero SE, 2.8L, Auto, only mid engine American car
    See a Pattern yet?

    15 year GM assembly line worker.

  7. #7
    Legend unplugged's Avatar
    Join Date
    Sep 2006
    Location
    High Deserts of SoCal
    Posts
    2,554

    Default

    Quote Originally Posted by homer911 View Post
    there is no shrader valve to check fuel pressure
    Don't throw the towel in.....get creative and put your own test port inline. I had a Dodge van with an intermittent problem. I bought an off the shelf fuel gauge and plumbed it inline and zip tied it between the wipers where I could see it. Then I was able to easily diagnose that the pressure was dropping when the vehicle was stalling.

    It's not a lot of fun to replace an in-tank fuel pump but I always feel better when I know that the pump is bad when I do it.

  8. #8

    Default

    when i replaced the fuel pump a few months ago i cheated BIG TIME!!!! i cut a hole in the floor pan right over the top of the pump. Easyally saved me hours of draining and pulling the tank.

    Due they make a in line shrader valve for tbi's or is it something that i will have to fangle myself? I already have the pressure gauge.

  9. #9
    Legend unplugged's Avatar
    Join Date
    Sep 2006
    Location
    High Deserts of SoCal
    Posts
    2,554

    Default

    Quote Originally Posted by homer911 View Post
    when i replaced the fuel pump a few months ago i cheated BIG TIME!!!! i cut a hole in the floor pan right over the top of the pump. Easyally saved me hours of draining and pulling the tank.

    Due they make a in line shrader valve for tbi's or is it something that i will have to fangle myself? I already have the pressure gauge.
    Aftermarket schrader valves are available. Just make sure it has a cap to seal it, because they are notorious for leaking.

    I will admit to taking my nibbler to the sheet metal for a custom access panel. Sometimes, it makes you wonder why the factory didn't provide the cutout.

  10. #10

    Default

    I would like to thank you all for your help with this matter... It ended up being the MAP sesor after all... I changed it last Sunday and everythigns been grand ever sence... Thanks again

Page 1 of 2 12 Last Post byLast Post by

Similar Threads

  1. 97 Burb fuel delivery issue???
    By evilram in forum Chevy Suburban Forum (GMC Yukon XL)
    Replies: 1
    Last: 07-20-2010, 10:40 PM
  2. Fuel Delivery problem
    By SPCMarty in forum Chevy C/K Truck Forum
    Replies: 21
    Last: 04-10-2010, 02:58 PM
  3. Fuel Delivery Problem with 1987 TBI 5.7l v8
    By Tagerman in forum Performance & Fuel
    Replies: 0
    Last: 02-14-2010, 10:09 PM
  4. fuel delivery issue
    By hotchickwitha454 in forum Performance & Fuel
    Replies: 5
    Last: 10-20-2009, 01:30 AM
  5. Fuel delivery problem on '95 TBI
    By jrduo4 in forum Chevy Suburban Forum (GMC Yukon XL)
    Replies: 4
    Last: 07-01-2009, 10:34 AM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •