1-16. EQUIPMENT OPERATIONS (continued).
The upper and lower fuel tanks have a combined capacity of 135 gallons. Fuel is pumped from the tanks by two
submerged electrically driven fuel pumps to a fuel distribution terminal, where it is routed to the personnel heater, APU
fuel pump and filters, or primary fuel filter or is returned to the tanks.
The primary fuel filter receives fuel from the fuel tanks. The main engine-driven fuel pump pulls fuel from the primary
fuel filter and channels it to the secondary fuel filter.
Fuel is delivered from the secondary fuel filter to the engine. The fuel-return crossover hose carries fuel from the right
to the left cylinder head. Unused fuel from the engine is routed through the fuel-return hose to the fuel tanks.