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  1. #1

    Default Fuel Problem 97 K1500 Suburban

    1997 Subrban K1500 4x4 5.7 Litre - Just spent the day replacing the fuel pump (original symptom - car would run for 1 minute - then fuel pressure drop), only to have similar symptom - pressure good - 50 lbs. upon idle out of gear for as long as you want - put it in gear - pressure drops (not immediately - takes a few seconds) and she stalls - pressure around 20 lbs. - then takes a couple of tries and pressure returns and she runs in park - and so on.

    New parts so far = fuel pump, pickup screen, wire harness, fuel filter.

    Anyone have any ideas for what to do next? Or what to check? I hate to keep throwing parts at it.

  2. #2
    Legend unplugged's Avatar
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    Default

    Did you check the return line? Check to see if it is clear. Also make sure you have the right gas cap on.
    Is it throwing any DTC codes?
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  3. #3

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    Didn't check the return line - assumed (I know) that since it will run in park forever, that the lines must be good) no codes - gas cap is correct.

    Side note - fuel system doesn't hold pressure once key turned off - drops to 25 or so - and isn't gong right up to full pressure either - takes 2 or 3 times (turning key on) to come up to pressure and start.

    Truck has been great for years up until now - started dying - it would restart - go 25 feet - die repeat the process. I reasoned that since the fuel pressure (then) was good - then dropped almost right away, that the fuel pump was bad - guess I was wrong - what next?

  4. #4

    Default

    Can you rev the engine up in Park?

    '96 K1500, 5.7
    6" RCD
    35" Toyo M/T On 16" Black Raceline Raptors
    4.56 Yukon Gears w/ TruTrac Rear
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    Dual Flowmaster 40's
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  5. #5

    Default

    That is affirmative - vehicle behaves perfectly in park.

    Note - have done further investigation - jumping pins 87 and 30 of the fuel pump relay caused the fuel pump to start each time - trip to the parts store - new fuel pump relay - problem solved.
    Last edited by Izone_Dave; 12-06-2009 at 07:52 PM.

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