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Fuel Problems, Please help!

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Emmettology 101, Jul 21, 2000.

  1. Emmettology 101

    Emmettology 101 3/4 ton status

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    FL
    Ok, for people who don't know, I have an 82 GMC Jimmy(fullsize). I swapped
    out the ol' 305 for a 1990 350 a couple weeks ago. Well at the time I did
    not know that this 1990 350 did not have a provision for a mechanical fuel
    pump and I had to use a mechanical unit. And I followed the instructions in
    Hot Rod and drilled out my old style intake to work with the new style
    heads.

    So my friend had a cheap Masters pump, like the ones at Auto Zone that I
    picked up for $15 buck brand new. I did not know much about elec. pumps so
    I mounted it up on the frame rail beside the engine. Well, it ran good
    around the parking lot, but when I took it out on the road it would bog/die.
    It wasn't blowing any black smoke out the pipes so I figured it was starving
    for fuel(as per what Summit Racing was saying) So I moved the pump to the
    rear on the frame rail so it was close to the tank. Well After I did that,
    no fuel at all. So I figured the pump may have been crap so I went out and
    bought a Holley 7psi pump. I mounted it in about the same place as the
    other, no fuel. So I followed the line and found a hole. I repaired the
    line and got fuel again. So I start it up and take it down the road and
    still get the bog/dying affect.
    At this point I am pissed.
    So, I go out and buy a new intake thinking the intake was leaking and I knew
    I had a carb bolthole that was stripping. Get home, put the intake on. Get
    the timing lined out and it fires up, I am happy. So I was trying to get
    the timing right and I must have turn the dist. too far and it wouldn't run,
    so I turn it back, still wont run. So I pull the fuel line off to see if I
    am getting fuel, NO FUEL. AAAAHHH!!!!
    So I go out and buy all new 3/8" fuel line and run it from the tank to the
    carb and I replaced all the rubber in the line also. Ok, I unhook the line
    and I get fuel now. So I am back to playing with timing and then I turn the
    distributor a little too far again and it wont start, so I pull the full
    line off and guess what, NO FUEL..

    So as of now, I have all new:

    carb - luckily under warranty at Auto Zone
    Performer Intake
    complete fuel line from tank to carb - 3/8's
    new fuel pump
    new filters

    Anyone have any suggestions? My next step is dropping the tank and maybe
    switching the sending unit or putting in the extra tank I have.

    Thanks in advance,

    Mike



    Mike [​IMG]
    1982 GMC Jimmy - <font color=green>Emmett</font color=green>
    http://emmett.coloradok5.com
     
  2. Burt4x4

    Burt4x4 3/4 ton status

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    Location:
    California (Modesto area)
    I hate issues like that!!
    The one thing that came to my mind was when I replace my fuel tank the sending unit had a screen type bag on the outlet tube. Now I'm talkin 72 so duno if it's the same but this screen was folded and kinda scrunched up on the sending units outlet tube. I removed it and my low fule pressuer issues were gone!!
    Best of luck and I hope you find it before you replace all the parts on your rig[​IMG]

    Rock ON![​IMG] 72 K5 [​IMG] Led Zeppelin
    http://burt4x4.coloradok5.com
     
  3. realsquash

    realsquash 1/2 ton status

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    Location:
    SE WI
    Yeah, take the tank off and check your filter screen on the end of your pickup tube. It isn't to uncommon to have those plug up/deteriorate. I cut mine off and ran a filter right outside of the tank in the frame by the fuel pump.

    Squash
    http://www.trailrunners4x4.org/users/realsquash
     
  4. Emmettology 101

    Emmettology 101 3/4 ton status

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    I was told by blowing air into the tank I could clean the "baggy" out a little and that if I put enough air to it I could blow it off. I put a little air to it, but I think I am going to put some real pressure behind it and see if that helps so I dont have to drop the tank.

    Mike [​IMG]
    1982 GMC Jimmy - <font color=green>Emmett</font color=green>
    http://emmett.coloradok5.com
     
  5. Burt4x4

    Burt4x4 3/4 ton status

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    The only concirn I would have is if the baggy is made out of materil by blowing it I would think it would make a mess out of the bag and then send that mess thru your fule lines in to your pump and so on. Just a thought.......

    Rock ON![​IMG] 72 K5 [​IMG] Led Zeppelin
    http://burt4x4.coloradok5.com
     
  6. Emmettology 101

    Emmettology 101 3/4 ton status

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    I thought about that, but I am running a filter before and after the pump and I will cahnge them often at first if I can blow that baggy off.

    Mike [​IMG]
    1982 GMC Jimmy - <font color=green>Emmett</font color=green>
    http://emmett.coloradok5.com
     

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