Personal watercraft fuel tank assembly

A fuel tank assembly formed to fit within a personal watercraft hull that includes a cavity therein having curved sidewalls, comprising:

• a main fuel tank formed as an elongate container, the main fuel tank having a front section, a rear section and a central section, the front section having a front end formed to engage a first inner wall portion of the hull, the rear section having a rear end formed to engage a second inner wall portion of the hull, the central section being formed to include a plurality of essentially rigid segments serially connected together by a plurality of flexible portions that provide elasticity so that the central section can deform to conform to a sidewall portion of the cavity and exert an elastic force between the front section and the first wall portion and between the rear section and the second wall portion sufficient to retain the main fuel tank inside the cavity.