Abstract: On a helicopter having a main fuel tank and outer curved walls with connector lugs thereon, an auxiliary fuel tank for each side of the helicopter, each tank being of aerodynamically streamlined configuration having an outer convex wall, a top rounded wall, a bottom rounded wall and an inner concave wall for abutment against said outer curved wall of said helicopter; a plurality of connector ears on said tanks for attachment to said lugs; said connector ears having a breakage point of 5000 PSI; said connector lugs having a breakage point of less than 5000 PSI, whereby said auxiliary fuel tanks may break away from said helicopter in the event of a crash landing; gravity feed lines from the helicopter's main fuel tank to said auxiliary tanks whereby said tanks are filled from said main fuel tank when said main fuel tank reaches a predetermined high level, and auxiliary pumps in said auxiliary fuel tanks for pumping the fuel from said tanks to said main fuel tank when said main fuel tank reaches a predetermined