Merc 60 6 hp won't stay running without bulb being pumped

[tohatsu9.9guy]

I have a 1964 Merc 60 6hp engine. I have rebuilt the carb in recent years, replaced water pump, etc. The engine has run great for years, but just recently has started dying after running for a brief period. It is dying because of lack of fuel. Motor will stay running if you pump the primer bulb, but will die if you do not. The fuel pump is good, as I have inspected it and replaced it just to be sure it wasn't the problem. This causes me to assume the check valve is the problem. Would a bad check valve cause the engine to not be able to stay running? If so, where could I find one, if they are still available, and if they are not available, could I adapt a different/ newer fuel pump with available parts to the carb? Thanks in advance for your replies. I hate to part out the engine and love using it and keeping it in working order, but this is getting harder and harder to do as parts become more scarce..

 

[krakatoa]

Re: Merc 60 6 hp won't stay running without bulb being pumped

I have a 1964 Merc 60 6hp engine. I have rebuilt the carb in recent years, replaced water pump, etc. The engine has run great for years, but just recently has started dying after running for a brief period. It is dying because of lack of fuel. Motor will stay running if you pump the primer bulb, but will die if you do not. The fuel pump is good, as I have inspected it and replaced it just to be sure it wasn't the problem. This causes me to assume the check valve is the problem. Would a bad check valve cause the engine to not be able to stay running? If so, where could I find one, if they are still available, and if they are not available, could I adapt a different/ newer fuel pump with available parts to the carb? Thanks in advance for your replies. I hate to part out the engine and love using it and keeping it in working order, but this is getting harder and harder to do as parts become more scarce..

Hello There!

It could be your fuel pump, but also could be a a pin hole in gas hose from tank to carbs... Inspect them as an elimination possible causes, hope this helps....

 

[Georgesalmon]

Re: Merc 60 6 hp won't stay running without bulb being pumped

Don't know what check valve your talking about. If your sure the fuel pump and carbs are OK I'd get a new fuel line and bulb. There could be some restriction in the line or bulb that can be overcome by pumping the bulb but not by the fuel pump

 

[Maxz695]

Re: Merc 60 6 hp won't stay running without bulb being pumped

Also check the vent and hose coming off the tank if it,s restricted or totally blocked by bugs etc. The bulb won,t work correctly. I disconnected mine and blew through it and surely enough things came flying out of the vent.

 

[Maxz695]

Re: Merc 60 6 hp won't stay running without bulb being pumped

Not often to see the check valves in the fuel pump go bad but the round gaskets that seal them in may be shot.