Reply To: 1954 Evinrude 7.5

[Fred Hickman]

I am GUESSING at your trouble, Russ. My GUESS is that air pressure, or air flow, may NOT be making the trip into the fuel tank. If I am correct, there would be insufficient air pressure in the tank to force fuel thru’ the hose, and into the carb. (Now then, if fuel is NOT being delivered, the motor will rev up, and die as the fuel LEANS OUT). AND, you mentioned that when you push the primer button several times on the tank, the motor will continue to run. (This fact supports my theory about pressure not making the trip to the tank). Furthermore, you said that you tried two tanks that work properly, and experienced the same-disappointing results. Lets assume that my theory is correct; The pressure system on the powerhead is not functioning as it should. Well, I do NOT know how the powerhead produces that pressure. I intend to research the pressure system, and learn just how it operates. I’ll get back to you with my findings.