Permanent Fuel Tanks

Shape matters as much as gallons

Below deck tanks are bought by shape as much as capacity. Moeller runs rectangular and flat tanks from 12 to 90 gallons for a stringer bay. RDS builds shaped tanks (belly, wedge, bow, starboard) for hulls where a box will not fit, which is how 20 gallons fits a space that would otherwise take twelve.

Plan the whole install, not just the tank. A permanent tank has to be secured against shifting, which is what the hold down and cradle kits do. The withdraw side is built in and cannot be moved later, so a starboard withdraw tank stays starboard. Vent elbows and the installation kit are separate lines, and a 90 gallon tank has to fit through your hatch.