It sounds to me that you are saying it leaks when the motor is in the up position and NOT running…. do I understand correctly that when you motor down river with your bigger motor it’s your kicker motor that leaks gas while in the up position?
So does mine. All I do is make sure the vent on my kicker motor gas tank is open to relieve the air pressure inside the gas tank. That way the gas is not forced out of the carbs to drip inside my boat. This stops some if not all of the leaking in my older 4.5 hp Merc kicker while it is in the up (non running) position. You can also unhook the gas line when not in use….