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  1. #1

    Question 1993 1500 won't start

    In the past 6 months the truck went from running fine to dead in the water. It progressed gradually from running rough to stalling while driving to sporadic starting to not starting at all. I replaced the cap, rotor, spark plugs, checked for spark and put a meter on it to make sure it had good spark. I tried spraying starting fluid in the intake to no avail. Pulled the bed of the truck off to try changing the fuel pump and for the heck of it tried running the truck while the pump was in a can of gas. For whatever reason we tried starting the truck with the pump out of the gas and it started, when we placed the fuel pump back in the gas the engine wanted to die. I replaced the fuel pressure regulator but that didn't help. There is a small hole in what I believe is a breather line coming from the fuel pump assembly but not sure if that would have an effect. Tried unplugging one of the injectors at a time and no help.

    Any advice would be greatly appreciated.

  2. #2
    TrailLeadr's Avatar
    Join Date
    Jun 2005
    Coventry, Rhode Island


    Well the truck would have run off the fuel in the lines. When you put the pump back in the tank the lines would have probably been dry.

    Have you tried cycling the ignition on and off a few times to get the fuel lines primed? Can you hear the pump running when it's in the tank?
    Last edited by TrailLeadr; 06-12-2007 at 11:44 AM.
    Rhode Island

  3. #3
    Sr. Apprentice
    Join Date
    Apr 2007
    Iraq (for now)


    Sounds like a fuel pump problem... but before you replace the fuel pump, check your fuel filter... Most of the time it's little stuff like that.
    If it ain't loud, I ain't interested.
    '93 Chevy Suburban K1500
    '04 GMC Envoy XL

  4. #4


    The pump runs, I can hear it and it does spray fuel from the injectors. I replaced the fuel filter when the problems first started. I have a fuel pump and am going to try that to see if the old pump is not producing enough pressure. Does anyone know if and where there is a port to test the fuel pressure, like a schraeder valve, with a fuel pressure gauge?

  5. #5
    Sr. Apprentice maxumpower's Avatar
    Join Date
    Feb 2007
    Summersville , West Virginia


    How many miles are on it? I had a similar problem with a honda and after doing all the same things you did with yours i ended up changing the fuel lines and also had a bunch of crap in the gas tank. When i dropped the fuel pump in it would run like crap and run fine out of a gas can. Can you see inside the fuel tank where the pump pickup is?

    (2002 Chevrolet 3500)
    (1991 Chevrolet K5 Blazer)
    (2000 Maxum Boat Powered By A 5.0 Chevy Vortec )

    (previous vehicles)
    1997 Chevrolet 3500
    2003 Trailblazer
    2002 Chevy Tahoe
    1993 GMC Jimmy
    1987 Chevy Astro
    1986 GMC Safari
    1997 GMC Sonoma
    1994 Maxum Boat Powered By A Chevy Vortec

    !!!Seems to be a pattern!!!

    If your going to jump then be sure to bring a parachute in case you change your mind on the way


  6. #6


    Can anyone tell me if and where there is a fitting to test the fuel pressure? I have looked by the throttle body and along the fuel rails on top of the manifold. If I could test the fuel pressure I might be able to narrow down the possible problem.

  7. #7


    You can check the presure at the fuel filter, Disconnect the coil wire from the coil and by the filter diconnect the fuel line going into the filter, and have someone turn the key like they are starting it when the engine is turning your pump will be running and you should see alot of fuel comming out of the line. Remember DONT smoke around fuel and make sure if you have a drop light under the truck remove it to a safe distance to where you can still see the lines. I hope this helps you and might want to try to diconnect the fuel line past the filter and reconnect the line going into the filter and see that you dont have a faulty filter. It does happen.

  8. #8

    Default Kinda sorta similar question....

    As you know I just bought a 1993 1500 myself.

    My truck had been hesitating when I stepped on the accelerator a few days prior, and died the other day when slowing down to turn a corner.

    Three nights ago the truck started, then stalled after about half a block and wouldn't start again. I work nightside at our local newspaper and get off work in the wee small hours in our downtown area (not a good place for a woman at 2am), so I got it to the curbside and arranged a tow to highly recommended and reputedly honest mechanic. Today he called and said it might be electrical, might be fuel injectors - he wasn't sure yet. I was thinking it was possibly fuel pump related, but I am not at all knowledgeable in this sort of stuff (my experience stops at changing oil, filters and brakes). I was planning to attempt simple repairs myself, but smart enough to know to stay away from anything at all complex.

    Since Streight1's symptoms sounded similar, I thought this might be a good place to post this.

    Is the mechanic being straight with me or should I go get the truck and try to repair it myself?

  9. #9
    Legend unplugged's Avatar
    Join Date
    Sep 2006
    High Deserts of SoCal

    Thumbs up Test the pressure

    Fuel pressure should be 9-13psi. A good accessible test point is at the fuel filter. Also check the return line for clogs. You should be able to blow air back through the line. A clogged return line can cause excessive pressure on the feed side. The TBI unit has a built in fuel pressure regulator:
    From: "The pressure regulator is a diaphragm-operated relief valve with injector pressure on one side and air cleaner pressure on the other. The function of the regulator is to maintain a constant pressure drop across the injector throughout the operating load and speed range of the engine."
    There is no way to happiness....happiness is the way.:yipi:  _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

  10. #10


    I had an ignition module give me similar symptoms.

    Mine was 50 bucks, easy to replace and it has been running like a champ since.

    I believe there is a test procedure to check the module but right now I can not remember it. STML

    Anyone remember the test procedure for the ignition module?


    You need to add your vehicle info to your signature, it makes answering questions so much easier if we know. Some of us, (Me especially, STML) have trouble remembering what all of our new, and even old member have for vehicles.

    Hell I need to put the engines for the vehicles in mine.
    Last edited by 84fiero123; 06-29-2007 at 06:14 AM. Reason: STML

    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.

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