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Christine ClarkAug 1, 2025
What to do if my Mercury 300 - PRO MAX 3.0L Boat engine will not start?
- TTaylor WallsAug 2, 2025
If your Mercury Boat engine won't start, several factors could be at play. First, ensure the lanyard stop switch is in the RUN position. Also, make sure you are using the correct starting procedure. The fuel might not be reaching the engine because the fuel tank is empty, the fuel tank vent is not open or is restricted, the fuel line is disconnected or kinked, or the fuel filter is obstructed. Other potential causes include old or contaminated gasoline, a fuel pump failure, an ignition system component failure, or fouled or defective spark plugs. In case of a flooded engine refer to the Operating Section.