Re: Primer bulb
Well you have,
pick up tube in the tank,
check value
then the line to the filter,
the filter,
line to the ball,
ball,
line from ball to another filter at the engine (most have a small one there)
then you have the fuel pump
then line to carbs,
and carbs.
Also on my old Johnson the little O rings on the connector for fuel line to the motor went bad making a bad seal. did the same thing.
Make sure the lines are clear, the filter (2 of them ) clear, and get a new ball ( I change mine about every other year) The sun makes the rubber go bad after a while.
I am betting fuel pump??
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1986 V20 
Old Fishermen never die, we just SMELL that way!!
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