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1948 - 1956 F1, F100 & Larger F-Series Trucks Discuss the Fat Fendered and Classic Ford Trucks

AC Fuel Pump Question

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Old Jul 16, 2012 | 03:27 PM
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AC Fuel Pump Question

I got the carburetor rebuilt, and the new fuel tank and sending unit all installed, and the old girl fired right up and runs pretty smoothly. I think a new set of spark plug wires will do it wonders, so those will be next.

After I got it running, I noticed a gas leak around the fuel pump (mechanical AC type). I removed the pump and discovered two small, vertically aligned holes in the casting near the rear mounting bolt. By manually actuating the pump rod, gas spits out of those holes. Can anyone tell me the purpose of those holes and what I might do to rectify the problem? The easy answer, I suppose, would be to get a new fuel pump, but curiousity has gotten the best of me and I hoping I can simply re-build it (unless it's not practical). Thanks!!
 
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Old Jul 16, 2012 | 03:45 PM
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I'm not sure which holes you mean, but it sounds like the holes provided as a "tattle-tale" so you know the diaphragm has failed. Can you remove the diaphragm to inspect?
 
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Old Jul 16, 2012 | 05:51 PM
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If the pump is rebuild able, do it. or replace it. Fuel coming from anywhere but the designated fuel outlet is a no no.
 
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