1970 85h.p. Evinrude Surging

[ifitwasus]

I have a 1970 85h.p. Evinrude. Carbs have been rebuilt and has new plugs. Took the boat out yesterday and after about 15minutes the motor started to surge when above a fast idle. The primer bulb was sucked flat so I changed replaced it with a new one. Still surging though. Any help would be greatly appreciated.

 

[EvstaG]

Re: 1970 85h.p. Evinrude Surging

One thing you could try to begin with is get a friend to pump the fuel bulb when you are running it "above a fast idle". If this improves the surging, we can be pretty confident it is a fuel delivery issue, and will know where to go from there.

 

[kenmyfam]

Re: 1970 85h.p. Evinrude Surging

Is the tank properly vented ????

 

[ifitwasus]

Re: 1970 85h.p. Evinrude Surging

Thanks for the suggestions. Looked at the fuel line from the bulb to the tank today and it collapsed on the inside.