Reply To: 1964 28HP Evinrude starts and dies

[billw]

Boy, this seems like a GOOD one. I guess if it were me, my next ideas would be:

Pull the fuel inlet hose off the carb and check for smooth, easy flow into a catch container, through all the plumbing, when pumping the primer bulb. (I am thinking about a hose collapsing internally.)

Start the engine, leave the choke on and see if it continues to run. I may be wrong but isn’t it designed to hold a fast idle as long as the choke is out? This would give some idea of whether you’re going lean from low speed circuit flow problems.

If the general mounting stud pattern is the same as the 33, I would temporarily put the entire 33 carb on it and see if the situation changes any.

If there is a run-away vacuum shut down unit on it, I would disable that feature temporarily and see if it stays running.

Without being disrespectful to you or your obvious talents in ANY WAY, how about a picture of how the float is installed? Like I said, I have put them in upside down a few times in my life in a state of total brain-fart and it does very much like what you describe.

Long live American manufacturing!