Bad Fuel Pump

Engine & Related

  1. RonLiv

    RonLiv Well-Known Member

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    The car was acting strange. It would run along fine and if I tried to accelerate it would hesitate. If I really got on it, the carburetor would backfire and the engine would near cut out and I had to take my foot all the way off the gas. I was thinking the ignition, or the carb were either bad or needed adjusted, possibly a timing thing. It is an old AVS 4682 Carter that was rebuilt and I did put a new ignition box in, as that was a former problem. One of the wires was sliding off the distributor at one point as well but solved that issue. Knocked myself out on this and decided I had exceeded my pay grade, finally brought it in to a real mechanic, one who specializes in Mopar and the guy who did the heavy lifting on my rebuild. On the way over, it died, wouldn't restart. Had to have it towed the last mile.
    Diagnosis-Bad Fuel Pump, never in a million years woulda guessed.
    This is why I shouldn't touch stuff, sigh...………..
     
  2. 69hemibeep

    69hemibeep Sponge Bob Square Wheels

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    Happy ending. If the new one acts up in a short period of time check the rod behind the pump for length, they do wear out.
     
  3. RonLiv

    RonLiv Well-Known Member

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    Thanks for that, would not have known.
     
  4. Russ69Runner

    Russ69Runner Well-Known Member

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    Did the fuel pump leak out the drain hole. That is a what I look for on them. Yes the pump rod will wear down also like Bob said. Glad you found it plus you have a lot of new part's.
     
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  5. Big John

    Big John Sit back, relax Don't bitch about the cigar smoke

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    Check the rod length while the pump is out. Should be 3.22" long.
     
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  6. RonLiv

    RonLiv Well-Known Member

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    Well, that didn't work. Picked up the car today and after about 30 minutes of clear sailing, same thing happens, loss of power, carb backfires, car shuts down.

    These are the steps taken:
    Checked for spark - has good spark
    Check for fuel - Carb was dry
    Removed fuel line from carb and crank - no fuel.
    Checked the fuel lines - no problems
    Removed line to pump - fuel flows freely
    Remove line from pump to carb and blow out - no blockage
    Check rod that rides on cam - OK
    Replaced fuel pump and tested it - OK / Test drive OK.

    Very well could be the rod though as you guys suggested, I don't know if it was specifically measured for wear. I've asked that question and have shared the measurement advice.

    Sigh...…….. Drove the crap out of this last summer without a hitch. Now this.
     
  7. Russ69Runner

    Russ69Runner Well-Known Member

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    Now what type carb are you using. May be a filter at the carb. Some have a small screen at the inlet. The holey has a small filter at inlet. Just a thought. Man nothing worst than fuel problem's or electrical can drive a man crazy. Hope you just had a vapor lock. Check gas tank vent pipe to see if it is plugged. Hope you find the problem. Russ.
     
  8. 69hemibeep

    69hemibeep Sponge Bob Square Wheels

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    You measured the rod?
     
  9. RonLiv

    RonLiv Well-Known Member

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    Not that I'm aware, they said they "checked it" so I don't know what that means. I asked the question about the measurement. Thanks!
     
  10. RonLiv

    RonLiv Well-Known Member

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    That's something I didn't think of, I'll check that as well. Thanks
     
  11. RonLiv

    RonLiv Well-Known Member

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    They measured it, it was exact.

    Checked it and after it gets hot it is losing pressure, I put a gauge on it to verify
    6 psi cold and less than a hot
    I ordered different pump and new push rod
     
  12. RonLiv

    RonLiv Well-Known Member

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    I have the original Carter 4682 AVS.
     

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