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EFV-8 Club Forum / General Ford Discussion / 6v fuel pump

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Discussion Topic: 6v fuel pump -- page: 1 2

41fatty

03-12-2026 @ 6:53 AM

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I bought a 6v fuel pump from D. Carpenter, mounted it in my 41 Fords left framerail, just forward of the left rear wheel.Intermitant switch for the pump. My stock fuel pump is working with all new steel line, good carb, clean original fuel tank. The car will more .than ocasionaly starve for fuel, then i'd hit the switch and be off again. I suspect a pinhole/rusthole inside my pickup tube in the gas tank? Can I run my fuel pump constant till I resolve this issue? Currently it's not fused. What amperage?

trjford8

03-12-2026 @ 8:28 AM

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Pump should be fused. I suspect it should have a 20 amp fuse. There should be instructions with the pump for a recommended fuse. I suspect with the occasional stalling you have some debris floating around in the tank that is occasionally blocking the pickup tube.

This message was edited by trjford8 on 3-12-26 @ 8:31 AM

kevinshea

03-12-2026 @ 8:37 AM

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I rely solely on my electric pump and have bypassed my mechanical one... works just fine... But as suggested, I should look into fusing it.

I also add an Star Tron enzyme to the tank that "eats" varnish and gum ...

And for long term storage I add Sta-bil to counter the ethanol.

JayChicago

03-12-2026 @ 10:26 AM

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"I suspect a pinhole/rusthole inside my pickup tube in the gas tank?"

You should have fuel pump with the glass sediment bowl. When your problem occurs, do you see air in the glass bowl?

Another common source of pin-hole leak to break the vacuum on the suction side of the fuel pump is the flex hose leading into the pump. The hose may look good, but if over time the hose has shrunk slightly the seal at the crimped-on fittings may no longer be air-tight. You can easily test this by removing the hose and pulling a vacuum in the hose with your mouth.

41fatty

03-12-2026 @ 12:49 PM

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yes, I'm getting bubbles in the fuel bowl, otherwise I'll try the vacuum in the rubber fuel line trick.

TomO

03-12-2026 @ 2:49 PM

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I would try a new gasket for the sediment bowl first. If your flex line is over 10 years old, you should probably replace it. Finally, check the connections to the electric pump. Any air leak on the input to the mechanical fuel pump will cause the problem that you describe. Fuel will not leak out of an air leak, so you have to make sure that all connections are secure and tight.

Tom

41fatty

03-13-2026 @ 11:44 AM

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Thank you, Tom, New bowl gasket and new flex hose, witch I'll still test. I've hooked up a 20A fuse to to the pump, ,will check fuel connections, including changing rubber hoses to pipe compression fittings,changing my pump inlet filter to one I can see through. Can I run my electric pump constant in line with the mechanical pump?

Barney

03-13-2026 @ 1:46 PM

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I had problems with my mechanical pump being undependable. I removed the pump and pushrod and installed a flat plate in it's place. A 6-volt electric pump now does the pumping; has been reliable for at least 2k miles. I also have a pressure regulator immediately upstream of the carb. The pump is fused and mounted in the left side frame rail under the driver.
Barney

carcrazy

03-13-2026 @ 2:09 PM

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Occasional stalling can be caused by an intermittent electrical connection in the primary circuit of the ignition system.

TomO

03-13-2026 @ 2:54 PM

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The mechanical fuel pump needs an input that is free of air leaks. I had problems years ago when I had an electric pump and filter. I eliminated the pump and went to a solid line from the tank to the firewall and installed the filter between the steel line and the flex line. I had problems priming the carburetor, so I removed the filter and now my car starts and runs fine.

IMHO you do not need a filter unless your tank is very rusty. The screen at the top of the sediment bowl and the sediment bowl is sufficient to keep debris out of the carburetor.

Tom

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