Fuel pump diaphram

Crappie Cracker

Recruit
Joined
Oct 21, 2018
Messages
1
I have a 1985 johnson 50 ho that keeps blowing a hole in the fuel pump diaphram. I have pump in three new rebuild kits and just put a brand new fuel pump. It runs fine for about an hour then starts surging.
 

racerone

Supreme Mariner
Joined
Dec 28, 2013
Messages
36,033
That sounds impossible.----Is the motor back firing ?----What is the compression on this motor ?-----There may be issues with crankcase compression pulses / pressure spike too.
 

racerone

Supreme Mariner
Joined
Dec 28, 2013
Messages
36,033
The 1985 model is shown with VRO.-----What pump is on it now ?----If not a VRO , what pump and how was it installed ?
 
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