Merc 5.7 260 stalling

[Godfirst]

Hi, well have a dilema here on the lake last weekend the boat stalled called the previous owner and said probably a electrical problem. Don't think so this enigine is caburated ran the engine for about 5 minutes today of course has a full tank of gas lol... and the engine idle seems to go down then it dies it was very hard to started back up after about three times not so lucky last weekend had to get it towed in, and has a fuel smell. Any suggestions? would really appreciate it.
Thanks

 

[Bondo]

Re: Merc 5.7 260 stalling

Ayuh,....

How about a full, complete Tune-up......

Might also need to Rebuild the carb...
But,...
You'll need to provide some Diagnostic results to nail down the Exact issue....

 

[Godfirst]

Re: Merc 5.7 260 stalling

Thanks for replying,
I was trying to save money and not do a complete tune-up? I have to determine the exact issue with each system I will annalyze where the problem is and go from there, anybody have similar problems and determine with solutions?
Thanks

 

[chiefalen]

Re: Merc 5.7 260 stalling

There is a filter in the fitting bye the carb, clean it.

There may be a filter in the fuel pump, clean it.

There a fuel water separator. Dump the contents in a clean clear container.

Wait a hour there water in there on the bottom.

At the gas tank there is a fuel pickup tube with a screen on the bottom.Clean it.

And the fuel anti-syphon valve it working well blow thru it.

Vent hose clear? Causing a vacuum condition?

Ok all filters clean at least the fuel pump and carb one.

You can run it on the water with a external tank with clean fuel.

That way you can rule out the fuel before we get to the carb.

Carb might me dirty need a cleaning, rebuild.

Post back the result of the cleaning of the fuel filter in the carb, fuel pump and running on external tank after carb cleaned.

Fuel pump is giving you 4-6 psi 7 psi max. But no less than 4 psi.

Good luck

 

[Godfirst]

Re: Merc 5.7 260 stalling

Thanks for the info,
I will attempt these procedures and get back to you and let you know the conclusion.