Fuel problem...need help

Discussion in 'Fuel and Air Systems' started by Skat pack, Oct 23, 2018.

  1. Skat pack

    Skat pack Member

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    I have a 69 dart with a 440. After the engine has been running for awhile and gets hot,it shuts off. I though it was an electrical problem but,I unscrewed the fuel line from the carb and cranked the engine....I wasn’t getting any fuel out of the line. I already replaced the fuel pump and have the same problem. Any ideas?
     
  2. Arron tate

    Arron tate 1973 H code Duster

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    Hello,
    Check to see if the tank has a good vent. You can try the same test with the cap off.
    If that is not the problem you can connect a test gas can to the input (suction side) of the pump. Re do test.
    If still NG do same test at the tank.
    NOTE: if you add a T at the carb inlet Or the output of the pump you can monitor the pressure with a Gage during testing.
    Also check for cracked / rotted metal / rubber lines.
    Hope this helps
    Keep us updated
    happy Mopar :)
    Arron
     
  3. MOPAROFFICIAL

    MOPAROFFICIAL Well-Known Member

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    Check the little rubber hose back at the fuel tank outlet/sender to hardline. Chances are it's cracked and the fuel pump is sucking air.
    That or the pick up might be clogged if it sat long with old gas. Make sure the cap is vented too.
     
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    • Skat pack

      Skat pack Member

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      Thanks for the help..I’ll try it
       
    • Skat pack

      Skat pack Member

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      Thanks for the help
       
    • Skat pack

      Skat pack Member

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      Thanks...I’ll check it
       
    • Skat pack

      Skat pack Member

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      Thanks for the suggestions....but,if it is one of those things. Wouldn’t there be a constant problem? Not just when the engine gets hot? Because , before it heats up,the car runs great
       
    • Fisher

      Fisher Old Guy with a Cool car.

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      If its getting hot and doing it, i an thinking you're getting vapour locked. Once the car cools down, and if you open the gas cap up and close it again will the car start? At what point does the car start again? Is there at least a 3/8 fuel line from the tank to the pump and up to the carb.
       
    • Cuda Al

      Cuda Al Well-Known Member

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      Check your fuel pump push rod, I had this problem on a new engine. Original rod was not compatible with the new cam and got worn down. Replaced it with a Comp Cam push rod and haven't had problems.
      2017-09-30_001.jpg

      Alan
       
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      • Dana67Dart

        Dana67Dart Most undignified way to get to Colorado!

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        As much as I don't like them get a clear fuel filter and see what is flowing when hot. Might have a carb float needle seat sticking issue?
         
      • RustyRatRod

        RustyRatRod Just another dumbass. FABO Gold Member

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        Post #3 is going the right way. You want to make SURE the source (tank) is clean and everything associated with it is in good shape. If it was mine, I would remove the tank and have it cleaned by a competent radiator shop. That's the only way to know for sure you have it clean. Then, as MOPAROFFICIAL said, make sure all the rubber hose in the fuel system is new and clamped properly. Fuel hose is cheap. If you remove and install the tank yourself, that's pretty cheap too. All it takes is a little effort and you can have a really nice clean fuel system.
         
      • Skat pack

        Skat pack Member

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        Once the car cools back down it will start right back up.
         
      • Skat pack

        Skat pack Member

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        I unscrewed the fuel line from the carb and not a drop of fuel is coming up from the pump. If I let the engine cool back down,then I get fuel.
         
      • Skat pack

        Skat pack Member

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        I’ll pull it this weekend
         
      • Skat pack

        Skat pack Member

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        I’ll take a look at that this weekend
         
      • Mattax

        Mattax Just the facts, ma'am FABO Gold Member

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        If its vapor lock, then based on what you describe here, its on the suction side. Check the routing of the entire feed line.
         
      • Cuda Al

        Cuda Al Well-Known Member

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        The worn down push rod will cause vapor lock symptoms as well as running hot. It was driving me nuts as to why my car was running hot even when it was not hot outside.


        Alan
         
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        • TrailBeast

          TrailBeast Slightly Twisted Member

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          The worn down fuel pump rod is a really good suggestion, as I have seen that happen before.
          Also one might consider replacing the rubber lines with EFI hose.
          It's a lot tougher and todays alcohol mixed fuels don't affect it near as bad.

          Taking the fuel cap off after it quits and hearing a long WHOOSH is a clue to no venting, which can override the fuel pump suction.
           
        • Skat pack

          Skat pack Member

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          I appreciate all the advice. I’m going to go through everything this weekend. I will let you know how I make out.
           
        • Skat pack

          Skat pack Member

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          I finally got a chance to work on my car. I pulled the fuel pump and the pushrod looks worn down. I ordered another one.
           
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          • Arron tate

            Arron tate 1973 H code Duster

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            Hello Scat Pack,
            Thanks for the update.
            Let us know when you replace it if that cured the problem
            Happy Mopar :)
            Arron
             
          • Skat pack

            Skat pack Member

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            I will, I also dropped the tank which is very clean inside and ordered a new sending unit. I’m hoping the problem goes away !
             
          • Arron tate

            Arron tate 1973 H code Duster

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            Hello Scat Pack,
            Just as a word of caution.
            Some aftermarket sending units don't accurately tell your gauge the correct level of fuel in the tank.
            Does your old one work correctly?
            Is so when you get the new one you can temporally wire it up with the tank still out (plug it in and Ground it). and see if it works from empty to full.
            When i replaced mine (Aftermarket) i found that out of the box the OHM readings were way off from what the factory recommends.
            I wound up buying three until i found one with 10 OHM at empty and 73 OHM full.
            Knowing that aftermarket units are not would progressively so that they will read correctly i decided to start with a empty tank and 5 gallons at a time and watch the gauge. I did this until the tank was full so I know what is really in the tank vs what the gauge says.
            If yours is a OEM and still works i would go with it.
            Change the gasket !!!
            There are plenty of posts on here that address tank senders.
            Hope this helps.
            happy Mopar :)
            Arron
             
          • Skat pack

            Skat pack Member

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            Thanks for the warning. I’ll check it first!
             
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            • moparmandan

              moparmandan FABO Gold Member FABO Gold Member

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              This is a classic sign of fuel boil. What some are calling vapor lock. Search it here and the Internet see what you think.
               
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