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Chevy guru's needed to solve problem

Discussion in 'Chevy Trucks' started by BAMP, Sep 24, 2014.

  1. BAMP

    BAMP Junior Member
    Messages: 9

    I've got a 97 chev 1500 ext.cab 4x4 with the 5.7L vortec engine.
    The problem is,sometimes when I step on the gas quickly truck will start sputtering and will stall if I hold peddle down.have to let off peddle and truck goes back to idleing fine.If I excellerate very slowly it works fine.almost seems like an injector problem,vapour lock or clogged fuel filter,but filters been changed.Im stumped!:confused:
    It does this more often if gas tank is near empty.and when it starts doing this I pull over and open gas cap and let out the pressure then it's fine for abit again.
    Any answers would be greatly appreciated.
    Thanks in advance.:confused:
  2. Pit Crew

    Pit Crew Senior Member
    Messages: 162

    Try a new gas cap.start there.
  3. cet

    cet PlowSite Fanatic
    Messages: 7,257

    Fuel pump, my 98 did the exact same thing. So many people told me it wasn't the fuel pump. Finally changed that and problem solved.
  4. Mr.Markus

    Mr.Markus PlowSite Fanatic
    Messages: 5,782

    My 96 is on its 3rd pump.
  5. Clevername

    Clevername Member
    from Indiana
    Messages: 67

    My 98 did the same thing. FUEL PUMP
  6. secret_weapon

    secret_weapon Senior Member
    Messages: 437

    You should check the fuel pressure. It needs 50psi minimum to run. Should be 55-60psi when you turn the key on before starting. Like mentioned before, most likely the fuel pump, but Diagnose it first. Don't just throw parts at it.
    Last edited: Sep 27, 2014
  7. Jeep_thing

    Jeep_thing Senior Member
    Messages: 144

    They are also known for bad crank sensors, and almost identical symptoms as fuel pump.
  8. RichG53

    RichG53 PlowSite.com Addict
    Messages: 1,135

    Try the fuel cap first..Cheap start..
  9. peteo1

    peteo1 PlowSite.com Addict
    Messages: 1,660

    Fuel pump is my bet too. My 99 Z71 did that to me for a couple weeks and then left me stranded. Fortunately for me I got stranded at home
  10. TJS

    TJS PlowSite.com Addict
    Messages: 1,440

    Fuel pump.
  11. gallihersnow

    gallihersnow Senior Member
    Messages: 304

    Fuel pump or fuel pressure regulator.
  12. jb1390

    jb1390 Senior Member
    Messages: 710

    Fuel pump. Will happen more when tank is empty because the pump will warm up. You can verify this by driving with a pressure gauge - it's easy to hook up to the pressure line with a gauge snaked up through the back of the hood by the wipers. Watch that gauge while driving, chances are it'll fall on its face when you hit the throttle.
  13. RS69

    RS69 Member
    Messages: 30

    I went through three fuel pumps on my old gas truck, replaced every couple of years.