85 120hp Evinrude primer bulb problem

[Luna Sea]

Engine has not been able to operate over 33-3500 rpms since I bought it. Earlier I was lead to believe “high speed stator coils were breaking down at high speeds” So I decided not to mess with it this season. But, the other night I had someone squeezing the primer bulb as I throttled up and I was able to hit 4800 rpms and stay there as long as he kept squeezing the bulb. Replaced external fuel lines and bulb when I bought it, internal ones last night and then bypassed internal fuel filter (temporarilly-should this have an air pocket in it???) Have the Seloc manual on my desk, reading about vaccum test, not very helpful. The line coming out of the top of the pump goes down under it and forward. Not very acessible where it goes to. Is that a fitting it goes to? It seems loose. Is this an air/vaccum line or something? I have 2 fuel tanks and switching doesn’t help so I want to troubleshoot a bit more. Any help/suggustions would be appreciated.

 

[mellowyellow]

Re: 85 120hp Evinrude primer bulb problem

this is a classice fuel pump problem. I would<br />start by re-building pumps and go from there.<br />a cheap/easy rebuild with the manual in hand.<br />good luck!

 

[Luna Sea]

Re: 85 120hp Evinrude primer bulb problem

Thanks mellowyellow. Pumps? Just one in there I hope.

 

[Ted S.]

Re: 85 120hp Evinrude primer bulb problem

Sounds like fuel alright, but check the fuel supply line too that you installed. If a fitting is loose you will draw air into the system causing fuel starvation. My 125 johnson had a similar problem and the fuel pump fixed it right up. Make sure the air pulse hose is ok and not blocked in any way as well. Cheers!

 

[Luna Sea]

Re: 85 120hp Evinrude primer bulb problem

Thanks Ted S. Hmm "Air Pulse Hose" That must be whats coming out of the top of the pump. Still need to know what thats connecter to down under where I can't reach. And come to think of it, the engine did used to make more of a sucking/vaccum noise when the high speeds were attained. This hose is a bit kinked cause it makes a 180 degree bend on the top of the pump.