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I'm looking for information on suggested minimum fuel tank size for a 2 stroke freshly re-built 10 year old Johnson 90 on a 17' Whaler. Here's the situation: Completly gutted the interior of the boat and am designing and building my own RPS. As I'd like to make sure that I have additional space for under-seat storage I don't want to fill the entire space with fuel tank. I also don't want to carry extra fuel in seperate tanks. My current design is based on an 18 gallon Moeller. Boat usage will involve journys as far as 20-30 miles between fuel stops.

Thanks, Vince Zappia