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51flathead carburetor

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  • 51flathead carburetor

    looking for help on carburetor as the engine starts then runs for about 5 seconds sounds like it bogs down then dies won’t restart for several hours and does same thing. i have instructions on how to adjust carb but can’t keep it running long enough to do anything. it is like its flooding out. when it dies it sounds like fuel is still going into the carb. i took top of carb off and noticed that no gas in bowl and that needle that goes down to let gas in when the float goes down was stuck and after cleaning it goes up and down like it should but i’m wondering if too much gas or too little in the bowl. y’all were great help in getting the starter issue resolved and been trying to keep it running ever since that was resolved. tank clean all good gas fuel pump works something just wrong. it will fire right up after sitting and smooth as can be and second i press accelerator it bogs down and dies.

    if i posted wrong i apologize and just not very good at this. thanks to everyone and wish you all a great 4th.

  • #2
    That sounds to me like the fuel pump diaphragm has a hole in it. How about some pictures of the carburetor? Is it a 97?
    You wana look waaay far up da road and plan yer route because the brakes are far more of a suggestion than a command!

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    • #3
      thanks so much for reply. the fuel pump is new but i can take it off and check.
      Attached Files

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      • #4
        another picture
        Attached Files

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        • #5
          Ok, couple things to check. First, pull the fuel line from the input to the pump and pull a vacuum to it. If you have not changed the rubber fuel hoses it would be prudent to. Hook a separate fuel tank to the pump and see if it draws fuel. You can also hook that separate fuel supply to the carburetor and as long as it is placed higher than the carburetor bowl, it should run good.

          If by drawing a vacuum on he fuel line to the tank you get no gas, change all rubber hoses to the new stuff. Make sure you are running the new high pressure fuel hose. BTW, if you put pressure to the fuel line to the tank make sure the cap is off and listen for bubbles. Just because you hear bubbles, doesn't mean the line is clear to bring gas forward, I have had a flap valve in a rubber hose that only let gas go one way!
          You wana look waaay far up da road and plan yer route because the brakes are far more of a suggestion than a command!

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          • #6
            Remember any cracks in the rubber fuel lines back to the tank will cause the system to suck air. You’ll lose the fuel suction. Go with Wiz’s suggestions and you’ll most likely figure it out. Keep us posted
            3 ~ Tudor's
            Henry Ford said
            "It's all nuts and bolts"


            Mitch's Auto Service ctr

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            • #7
              that’s great and i will do exactly that tomorrow and get the new high pressure gas line as i had hard time finding a fitting that screwed in the carburetor that would accommodate the gas line and like an idiot i just got some clear line for part of the gas line and in pictures you can see where i connected that clear line to the metal line from tank then to a gas filter then to the only fitting i could find that would screw into the fuel pump i know i messed up but when i disconnect the line from fuel pump to carb and hit the starter gas shoots out but only after i filled the glass bowl with gas.
              Attached Files

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              • #8
                When it "dies" is there fuel in the fuel pump glass bowl?? A leak where the bowl seals to the pump will give you this fail (gasket should be cork).
                Disconnect the line at the carb, have someone crank it over and see if you get a steady stream of fuel to the carb.
                Paul in CT

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                • #9
                  disconnected the line from pump to carburetor and definitely steady stream of fuel to carburetor. it will easily start after sitting a bit and Does the same darn thing in Then it will run For about five seconds Then starts bogging down and dies.

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                  • #10
                    The proper way to test fuel pressure is with a gauge at the carburetor. This will tell you if the pressure drops off any after running. If it does not, then it is not a delivery issue up to that point. Otherwise it is just a crapshoot. This is all you need.. A low pressure combo vacuum gauge. It can even be driven with this on for high speed issues
                    https://www.harborfreight.com/Fuel-P...ter-62637.html

                    You can also richen it with carb cleaner when it is acting up to see if it is a fuel issue.
                    3 ~ Tudor's
                    Henry Ford said
                    "It's all nuts and bolts"


                    Mitch's Auto Service ctr

                    Comment


                    • #11
                      Maybe an electrical problem - bad coil or condenser. They can fail when hot, be ok when cooled down.

                      Comment

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