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Thread: 97 silverado 5.7 fuel sys problem. injectors?

  1. #1
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    97 silverado 5.7 fuel sys problem. injectors?

    hey and thanks for looking. im working on an 87 silverado that has sat for 2 years. it ran 6 months ago, but needed the fuel pump replaced. i went to get it started yesterday and the pump was stuck again. pulled the tank and replaced the pump and sender unit, all back together. ok, still no start. i am imagining the injectors are stuck, but this motor is foreign to me. i thought it was a regular throttle body injection till i went looking for the injectors. the manifold has me baffled. i see a fuel inlet, outlet and a small bundle of wires just behind the air intake going down into the manifold, but no clue what to do now. i have fuel pressure to the valve bleed, but i havent put a guage to it yet. its a customers truck, not mine. i normally work on mopars and fords, so this is the first i have seen this. anyone know what to do next?
    motor turns and runs with external fuel source, but wont run on
    it's own. fuel pump does pressurize with the key on/start and shuts down as it should when the motor stops. i know it's sticky injectors, just have no clue how to get to them nor how to unstick them. in the past, light tapping on the injectors while motor was turning or running on carb spray has worked, but at least i could find the injectors to tap them.
    help? anyone?
    thanks
    and yes, i have 5 gal fresh fuel and 2 bottles of fuel cleaner in the tank.
    i have bypassed the relay and run the pump about 20 minutes total to circulate the fresh fuel and cleaner through the system.
    it does bleed off and return to the tank from the
    regulator and injectors, am i correct? are these built
    into the **** intake manifold? im starting to think so.

  2. #2
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    bradrhale's Avatar
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    does it have fuel rails?? if it does, than yes. the injectors are in the intake manifold. unusual that an 87 has that unless someone put a new ecm in there and changed a bunch of stuff. might be a 95 model setup where you have a fuel spider underneath the intake. but again, all that would have to be aftermarket for that year.

  3. #3
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    leolkfrm's Avatar
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    can you post any pics? it always helps
    4 wheels move the body
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  4. #4
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    hey guys and thanks.
    i'll try get pics and the vin code tonite. i saw no fuel rails of any sort, and the motor and everything attached is bone stock. i have never seen wires and fuel lines go into the top of an intake manifold before. i don't recall smoking anything extrodinary yesterday... but trying to remember what i saw makes me wonder. i do know it was not throttle body, nor mpfi, nor tpi from what i ever remember working on. this is something i have never seen before, and as i said... bone stock.

  5. #5
    Senior Member NonGoggleGuy's Avatar
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    In '87, all 350 SBCs were TBI I think. It doesn't sound like this truck is stock.
    Bored? Check out Project: Wreck. But only if you're really bored.

    - The NonGoggleGuy -
    I'm unbelievable... believe me.

  6. #6
    Senior Member NonGoggleGuy's Avatar
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    If it runs with an external gas source, it could be a clogged fuel filter.
    Bored? Check out Project: Wreck. But only if you're really bored.

    - The NonGoggleGuy -
    I'm unbelievable... believe me.

  7. #7
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    Quote Originally Posted by NonGoggleGuy View Post
    In '87, all 350 SBCs were TBI I think. It doesn't sound like this truck is stock.
    i'm with him, something is fishy.
    <----just your average 5.3

  8. #8
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    it's a 97. heres the pics.

    Ok, Im back. I guess starting with the correct year might help some... Sorry bout that. 3/97 Silverado 1500. vin 1GCEC19R4VE220739 Air plenum says Vortec. Heres the pics.
    Attached Images Attached Images    
    Last edited by rodsterdewd; 03-31-2009 at 05:25 PM. Reason: Found out how to attach pics.

  9. #9
    Senior Member NonGoggleGuy's Avatar
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    Click "Go advanced" and use the paper clip icon.

    And the year makes more sense now. Did you change the fuel filter as well?
    Bored? Check out Project: Wreck. But only if you're really bored.

    - The NonGoggleGuy -
    I'm unbelievable... believe me.

  10. #10
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    ok, i posted the pics, thanks. not replaced the filter yet. next on the list.

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