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Old 03-31-2007, 12:58 PM
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Fuel System

Looking for suggestions for a fuel system problem - I have a 39 Ford with the original fuel tank that has been dipped, cleaned and painted. Fuel filter and fuel line has been run up over the axel and down frame rail to the high volume mechanical fuel pump.

Problem - If I let the car sit for more than a couple of weeks without starting, I lose fuel to my fuel pump. I do not have leaks or puddles on the floor and I cannot figure out why or where the fuel is going, barring it getting sucked back into the tank.

Any suggestions would be appreciated.

David

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Old 03-31-2007, 06:38 PM
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Remount the pump as close to the tank as possible, electric fuel pumps push hard but don't pull very much, I would mount it lower than the bottom of the tank between the rear axle and the tank
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Old 04-01-2007, 10:56 PM
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Fuel System Problem (2)

Thanks for the response beach10222. I have a high flow mechanical fuel pump, not electric. I can't move it from it's engine mount position. Are you suggesting replacing the current fuel pump with an electic pump?

Do you have any suggestions that might explain the problem while using a mechanical fuel pump?
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Old 04-02-2007, 07:10 PM
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Sorry, I didn't pick up on the mechanical part, yes an electric pump would solve the problem but they tend to be noisy. As for your mechanical pump problem it is most likely the incoming check valve inside the pump it seems once they pick up some trash they won't free up and close again, that allows fuel to drain back into the tank. If your pump is held together with screws you can take it apart and clean the valve, if not you can try air pressure but no more than 15 lbs. or so.
Good Luck, Dave Johnson
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Old 04-02-2007, 07:51 PM
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Another thing to check is whether your vent to the tank is plugged. If it is when you are running you create a partial vacumn in the tank and when you stop it will very slowly suck the fuel back into the tank.
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