What is the capacity of the C-130J APU fuel tank?

The C-130J APU, or Auxiliary Power Unit, is equipped with a fuel tank that has a capacity of 3.5 gallons. The APU provides electrical power and pneumatic power for various functions, including starting the main engines and supplying air conditioning and other systems when the aircraft is on the ground. The 3.5-gallon capacity is designed to support the operations of the APU for a certain period without needing to tap into the main fuel system of the aircraft. This design ensures an efficient and reliable power source while maintaining the overall fuel management of the C-130J.