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Dominick, Marine Mechanic
Category: Boat
Satisfied Customers: 1009
Experience:  25 Years Experience as Mechanic, 20 Yrs Boat Yard Owner/Mechanic, Factory Certified
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John, i'm trying to resolve problem with my Yamaha 115 4-strok

Customer Question

Hi John, i'm trying to resolve problem with my Yamaha 115 4-stroke outboard. Runs fine for a while, but then motor loses power, and fuel gauge drops to empty
Submitted: 2 years ago.
Category: Boat
Customer: replied 2 years ago.
Usually, restarting the engine fixes the problem for a while. But then issue comes back in several minutes.
Fuel is fresh. And I have water sep fuel filter installed
Customer: replied 2 years ago.
Also, I pulled the fuel pickup but there was no trash in the tank or on the fuel pickup screen.
Expert:  Jeff G. replied 2 years ago.
Welcome,this question may need more than a single answer. Please post back with additional questions on this at any time.
The fuel gauge should have no bearing on the engine running with the exception of losing electrical power.
If you suspect a fuel restriction, remove the anti-siphon valve from the fuel line connector to the fuel pick up at the tank. Take the fuel line off, unscrew the hose barb, the valve is inside and replace it with a full flow hose barb of brass or aluminum.
Do you have access to fuel pressure gauges to test the fuel system?

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