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EFV-8 Club Forum / General Ford Discussion / Still Getting Vapor Lock

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Discussion Topic: Still Getting Vapor Lock -- page: 1 2

kevinshea

04-20-2026 @ 12:48 PM

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Posts: 13
Joined: Jun 2016

For my 35 with a 59AB, I wrapped the fuel line in what I recall was a kevlar (?) sleeve as I tried to reduce any heating of the fuel line.. I am in New England and we don't see much in the 90Fs. I also chose to run an electric pump, mounted on the frame under the driver seat. haven't had a problem.

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52flatv8

04-18-2026 @ 7:33 AM

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If there is a flexible fuel line in the system, I have had the inner lining delaminate and collapse restricting flow.

carcrazy

04-17-2026 @ 2:37 PM

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While you can buy a 6V coil from NAPA, my experience with them has not been good. You can also buy a 6V coil from Fifth Avenue for $90, C&G for $29.95, Dennis Carpenter for 39.95 or VanPelt for $22.00. In my experience, the most reliable ones are also among the more expensive ones!

carcrazy

04-17-2026 @ 1:49 PM

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Yes! Using a 12V coil in a 6V electrical system is a problem.

Is your electrical system still 6V using a positive ground to the battery? If so, you should be using a 6V coil with the coil + terminal going to the distributor. The - terminal of the coil should go to the ignition switch. If you wire the coil up backwards, you will reduce ignition output by about 30%.

You can probably buy a 6V coil at your local NAPA store.

TomO

04-17-2026 @ 1:49 PM

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1. Do a fuel delivery test to make sure that you are getting enough fuel and that the line is not plugged.
2. Check all fuel line connections to make sure that they are tight and not leaking air.
3. Replace the sediment bowl gasket.

It sounds like your fuel pump is not providing enough fuel to the carburetor. The electric pump is pushing gas through the line and the mechanical pump has to suck it from the tank. Having an electric pump in the line makes it more difficult for the mechanical pump to suck fuel. Connections that work OK at 70 degrees may fail at 90 degrees if they are not not tight. A dried out sediment bowl gasket will work fine until the pump and bowl get hot, then it will leak air.

Let us know how you make out.

Tom

wlobb

04-17-2026 @ 1:11 PM

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