Question about 1981 Ford F 100

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Ford F100 Fuel System

I have a 1972 Ford F-100 with a 302 engine that my young son is attempting to get running again.
There’s no fuel at the carb. It will run only as long as I drop enough fuel directly into the carb.


  1. The fuel filter is not blocked.
  2. The fuel lines are not plugged.
  3. I can manually pump the fuel pump and it works.

How does the pump “****” the fuel out of the tank? The gas tank is behind the seat and the suction tube in on top of the tank. Could a leaking gas cap allow too much air in the tank so that the fuel pump only pumps air? Does the fuel suction line attached to a “dip” tube in the tank that might be plugged? We haven’t pulled the gas tank out yet to clean it out/check for sludge, etc.


Thanks for you help.

Renard L. Sanders

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  • 2 more comments 
  • Anonymous Mar 18, 2014

    how do I fix a fuel leak running along the fuel line by the gas tank

  • Anonymous Mar 28, 2014

    sat for while,cleaned tank , new fuelpump on fromt tank ran 5 miles and quit. no gas to carb only to box on rail.

  • Anonymous Mar 31, 2014

    Fuel leak on top of gas tank when gas is being pump at gas station fuel line diagram o layout

  • Anonymous Mar 31, 2014

    Fuel leak on top of gas tank when gas is being pump at gas station fuel line diagram o layout
    Econoline ford 1998 350

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  • 398 Answers

There are a couple things here. In the first place if you can pump fuel with the pump off the engine and pumped by hand doesn't mean that it will pump on the engine. See the stroke on the engine is very short, it only moves like 1/4 inch. So you could have a bad pump even though you are pumping by hand. The gas cap, will have no effect on this model. Yes the pick-up tube has a filter on the bottom of it, and it could be stopped up. You can remove this unit up through the top of the tank, got to wiggle it and turn it sideways, and if you can find a used one( New ones scarce and expensive) by going to used parts place, and look for 1967 - 1972, they are all alike. Lots a luck in fixing this great ole truck.

Posted on Aug 12, 2008

  • bill  willis
    bill willis Aug 12, 2008

    Oh yes when looking for the tank unit, you are looking for fuel tank sending unit. It is all one assembly.

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How hard was it to pump it by hand?Iwould be suprised if a mechanical fuel pump could be easily pumped by hand as the spring pressure required to hold the arm against the eccentric is considerable If its a cleveland or windsor you cannot pump by hand.I own a 1980 running a cleveland and found that if you put an electric pump as close to the fuel tank as possible and have a good original mechanical pump fuel delivery is no longer a problem.I had to do this as soon as i went to a 600 holley as the original pump was not able to supply sufficient flow.the electric pump doesnt have to be an expensive hi volume type,it only has to help to get fuel to the mechanicl pump

Posted on Oct 09, 2008

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Hi,

To my knowledge, most Ford models of this year uses a mechanical (diaphragm type) fuel pump not electrical. However, it is possible to install an aftermarket electric fuel pump in lieu of the mechanical pump. If this was done to your Ford F 100, it would either be either near the carbs or the fuel tank, follow the fuel line.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

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