Re: 70 Johnson problem
An obstruction can cause your primer bulb to collapse (suck in).
I don't know if that's your problem, I'm thinking not, but probably would be simple enough to run it on a separate fuel line and portable tank to eliminate the possiblity of an obstruction.
Other than that, and the fuel pump, I would have to consult the experts on this site. Skools could probably help as he is a "Johnson" man. ;)
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1994 Wellcraft V21
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