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I don't have a built in tank but, my rule for fuel is ALWAYS Start with the "FRESHEST" fuel mix that you can. I use any old left over fuel in the lawn mower after properly fogging the outboard engine for the winter. I run "Sea Foam" in with my fuel mix (1 oz. per gallon) all year to keep the engine running clean, and prevent "Carbon" build up. Gasoline begins to break down after only 30 days (even WITH fuel stabilizer in it). I would empty the tank if I could.