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1983 70hp Fuel flow problem

mullet_inn

New member
"Hello all I am new to this bo

"Hello all I am new to this board.
I have a 1983 70hp merc. The motor runs good but has had a problem loosing its "prime". When running at 75% power I have to pump the bulb or it looses power. Today a new problem happend, to keep the motor from bogging out under load I hand to hit the choke. This would get it up on a plane and wind out at WOT. Agian while doing this I still would have to pump the bulb every 30-40 seconds?
Fuel Pump?
Fuel Line?
or bad connections?
Thanks for any help.
Tim"
 
"symptoms point to fuel pump.

"symptoms point to fuel pump. does ball go flat? if so check tank vent, and anti-siphon valve."
 
"Ball dose not go flat, but fe

"Ball dose not go flat, but feels about half full when power starts dropping off. It firms back up with a couple of squeezes along with the power coming back up.

Thanks Tim"
 
"Tim,

It sounds like the fu


"Tim,

It sounds like the fuel pump is not working properly, but it could also be the check valve in the primer, or an air leak in the hose.

Tony"
 
Thank you for the help. Will s

Thank you for the help. Will start with a new hose set up. Any suggestions on a new hose? Will a Wal-Mart on work fine? Or a mercury one?

Thanks Tim
 
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