Re: Fuel line check valve?
Finally got to work on the Mercury today. I traced the fuel line from the tank to the fuel pump and found a spot where the steel fuel line comes within an inch of the exhaust pipe. (My '54 has dual exhaust so does not have the front crossover pipe like most Ford and Mercury cars of that year.)
After the car heats up the steel fuel line gets very hot in this spot and boils the gas before it gets to the fuel pump. This causes the sediment bowl to fill up with bubbles and eventually starve the pump (and car) of fuel.
Today I encased the fuel line in that area with a length of DEI Heat Shield Sleeve and wrapped the exhaust pipe there with some DEI Heat Shield Wrap. See the photo for details.
I drove the car, stopping a few times to check the sediment bowl for bubbles. None. Fingers crossed, problem solved.
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