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need to pump accelerator alot for cold start on 60 hawk 289

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  • Fuel System: need to pump accelerator alot for cold start on 60 hawk 289

    i have to pump up [10 or 12pumps] on accelerator on any cold start over 3-4 hours. fuel pump?

  • #2
    It sounds like the accelerator pump is not doing it's job. With normal output, 10 or 12 pumps would likely cause a flooded condition. If the car runs well after its started, the fuel pump must be adequate. Does it stumble under a hard acceleration while driving? I would check fuel pressure, but it seems that the carb might need to be refreshed.

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    • #3
      Accelerator pump, or possibly inadequate fuel delivery from the pump.

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      • #4
        If your car was hot 3 or 4 hours before It could be fuel evaporation. Todays fuel will do that , Ed

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        • #5
          Also check when cold if the choke is working. If it's working right one or two pumps and the choke should do the rest.

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          • #6
            If your fuel pump and carburetor are working correctly, and the motor is timed correctly, all you should have to do on a cold start is depress the accelerator pedal one time, to set the choke. If this is the lone symptom you might pull the air filter housing, depress the accelerator pedal once and see if the choke sets properly. It should be fully closed. If not, you will need to adjust the tensioner spring until it just fully closes. The other thing you should check, while doing this, is to look down the carburetor throat and see if you get a good healthy squirt of fuel when the accelerator pedal is depressed. If not, then you have a problem with either the accelerator pump, or possibly a partially blocked circuit.

            The other possibility that comes to mind is carburetor bleed down. Also known as, no fuel in the fuel bowl. Depending on conditions, (how long the vehicle has sat), the fuel either evaporates from the bowl, or it drains back into the tank. 10, or so engine revolutions should allow the fuel pump to refill the bowl. Probably a problem with the fuel pump allowing fuel to return down line.

            When you solve the problem, please let us know what you found and how you fixed it.

            Thanks, Bo
            Last edited by Bo Markham; 03-13-2020, 04:06 AM.

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            • #7
              I just finished replacing the hard fuel line on my ‘64 and was shocked how bad it was. The worst area was under the front of the motor where it was clipped to the frame (and always wet/oily and dirty. ). It fell apart as I removed it! Full of pinholes and a certain leak point. Not sure how this may relate to the OPs problem but in the long run with these Kennedy era cars it makes sense to renew as much of the fuel delivery system as possible.

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              • #8
                thanks guys , new carb on the way. hope thats it .if not ill move back upstream

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                • #9
                  This may require a process of elimination, as mentioned above the volume of fuel when the pump is actuated, remaining fuel in the bowel and possible vacuum leak, a slight vacuum leak will cause hard starting, the engine sucks more air than fuel and eventually the fuel catches up to the air and then it will start.

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                  • #10
                    I would try this let the car sit for 3=4 hours,remove the air cleaner and activate the accelerator look for the gas spraying in the carb from the accelerator pump,no gas? the bowl is empty,evaporation because of the corn gas. and or fuel returning back to the tank.It might also be a worn accelerator pump.

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