[TidalFly]

Thanks I will try suggestions and circle back

 

[TidalFly]

Going to run on remote tank first to rule out tank to engine issues. If problem persists, planning to place clear line just before fuel pump to see if air bubbles are in line before getting to pump. Will report back.

 

[TidalFly]

Update: ran motor on hose at idle with brand new remote tank with brand new ethanol free gas in it for 30 minutes, sputter and die issue did NOT occur.

As I type this, motor is 45 minutes into idle on hose connected to boat fuel line as it was when this issue presented itself. So far 45 minutes in the sputter and die issue has NOT occurred.

At this point I’m not really sure how to explain the situation. If this is useful knowledge, the issue occurred in Flamingo when I had towed down from South Carolina. The problem presented itself Monday and was constant (sputter/die after idling for a short period but ran fine when running at higher RPM), changed the fuel lift pump on Wednesday. Problem persisted Wednesday afternoon with no change after replacing fuel pump.

Only thing I can speculate is MAYBE condensation in fuel created by change in temperature from SC to South Florida?? Not even sure if that’s a realistic thing to speculate.

I guess at any rate, I’m not able to recreate the problem at the moment. Granted I haven’t actually run the boat at different speeds since I got back, just on the hose.

Any thoughts?

 

[TidalFly]

Ok, going to put it in tomorrow and run at different RPM’s and see if it has issues when going back to idle.

Random question, any idea how long a 60 hp four stroke takes to burn through gas in the engine? Just wondering having gone from remote tank back to boat tank, how long it was running remote tank gas still before burning any boat tank gas.

 

[TidalFly]

It did it both in gear and at neutral this week in the glades.

 

[TidalFly]

Update: Just ran the motor on the hose with clear piece of tubing on intake side of fuel lift pump. Purged air via bulb before running on boat fuel line. Runs without bubbles for a period then bubbles begin to appear in clear tube. Connect remote fuel tank/line (brand new) and repeat the same process. Bubbles appear after the same
amount of run time. This would seem to indicate there is an issue within the engine, not the fuel line from tank to engine. Connections at canister fuel filter on engine are sealed tight with no smell of fuel, and the canister itself is intact (no cracks/etc). Anybody have an idea of somewhere else on the motor where air could be entering the fuel line? Maybe the fuel line connection at the motor?

 

[TidalFly]

Yep, sniffed all connections between the fuel line connection on front of the motor and the clear section I put in while motor wasn’t running and smelled no fuel, but clearly there’s air entering somewhere. In theory, I could just replace everything between fuel line connection and the lift pump and it should eliminate the issue correct?

 

[TidalFly]

 

[TidalFly]

Above is what mcmsly2 sent me when I was having issue. He bypassed the solenoid valve that vents the vst as it’s “told” to do so by the engine computer. I never ended up having to do this, because I only had the problem idling a long way down buttonwood canal at Flamingo. I never have to idle that far in my home waters. The issue only seems to exist when extended idling. Solenoid valve opens/closes for proper venting while running at speed.

 

[TidalFly]

I never had to fix it because I rarely idle for long periods of time. @mcmsly2 put a T fitting in line before the solenoid valve that vents the VST and vented it outside of the cowling. Only issue with that approach is there is no pressure held in the VST because the valve is bypassed and can't "close" to hold pressure in the tank. Result is a need to prime the bulb to reestablish pressure prior to starting the engine.

 

[TidalFly]

The pictures I posted on page 1 of the thread are what @mcmsly2 sent me when he walked me through the fix. You can see the T inline prior to the valve, and you can see the line he ran off the branch of the T that daylights and vents outside of the cowling.