problems with 98 350 vortec chevy engine/ fuel problems?

well i found a cheap truck that i want to buy but it had been sitting for 6 months with an open gas tank. i drained the tank refilled it with gas but broke fuel input on pump assembly. swapped that out with another used one.tried to start but didn't show signs of life. replaced fuel filter and primed motor with gas in the throttle air inlet, it runs for 4 seconds then dies. swapped injector assembly and cleaned head after a while got it to run for 10 seconds poorly without prime. but it was back firing. i had to undo some electrical but i thought it was all back were it belonged i can only hope its he fuel pump because i have eliminated every thing else. is there any thing i have over looked?please help? and i doubt its the computer

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2 Responses to “problems with 98 350 vortec chevy engine/ fuel problems?”

  1. goldwing127959 Says:

    Fuel pump pressure and fuel pressure reg.
    check the pressure. Is it what it is to be?

  2. boogie_4wheel Says:

    Check fuel pressure at test port (located slightly to the driver’s side of the motor at the rear). You should have 60+ psi.

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