- Tanks: 270 gallon fuel tank, 75 gallon fresh water tank, and 35 gallon holding tank
very popular model for many years, the Wellcraft 3400 Gran Sport is built on an easy riding modified-V hull with a 12'-6" beam and 16 degrees of deadrise at the transom. Aside from her attractive lines, the major attraction of the Gran Sport is her wide-open floor plan. This particular model has a walk-thru transom and large swim platform.