Before starting an inboard gasoline engine, you should remove the engine cover completely to let the engine air out. Next is to change the fuel filter or the water separator. Marine fuel filters and water separators help draw water from the boat fuel, therefore protecting the motor from the water. If water were to get in, it could cause serious problems.
You should also consider changing the engine oil. This is especially so if the motor boat has been sitting around for a while. The fourth step is to change the oil filter. It is recommended that the oil filter is changed every 100 hours or every season. Other steps include;
Recharge the battery.
Refuel your boat.
Check the cooling system.