the APU, and generates a small voltage which is converted to an indication on the engine
speed indicator instrument during engine operation.
1-22. The fuel system consists of a fuel tank, an electric motor-driven fuel boost
pump, a disposable-element type fuel filter, and connecting rigid and flexible plumbing.
The filter and boost pump are mounted on a support bracket, which is bolted to the
engine support frame on the trailer. All components provide a complete and independent
fuel system for the operation of the APU while on the trailer. A flexible hose, connected
to a dummy fitting, connects the fuel system to the APU.
1-24. The fuel tank is a 40-gallon-capacity aluminum tank built into the trailer frame.
The tank has a four-inch diameter filler neck, an overboard vent, and a drain fitting
for draining condensation or for draining the tank prior to shipping or storage. A
standpipe and fitting connects to the fuel boost pump through rigid tubing. The tank
filler cap incorporates a dipstick fuel indicator.
Figure 1-5. Fuel System Schematic