Johnson FD-11 not pumping air to tank

[Jim Brizzolara]

I’m working on a friend’s 1957 Johnson 18 hp. I verified that the motor is not supplying air to pressurize the gas tank by using my tank which is in good working order. The motor will run as long as I occasionally prime the carb using the button on the tank. After a few minutes of running it like this there is no pressure in the tank when I crack the gas cap. Is there a check valve or something else on the motor causing this issue?

[frankr]

That is a possibility, all right.  There is a rubber-flapper-type check valve on the reed plate.

[Jim Brizzolara]

Thanks Frank. It turned out the hole on the fuel connector on the motor was plugged with dirt. She’s pumping air now.

[Jim Brizzolara]

Thanks Frank. It turned out the hole on the fuel connector on the motor was plugged with dirt. She’s pumping air now.

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