FUEL TANK

TM 55-4920-424-13&P

1-19. FUEL TANK. (See figure E-1.)

1-20. The fuel tank is a 40-gallon-capacity aluminum tank built into the trailer frame. The tank has a four-inch dameter

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.

1-21. BOOST PUMP. (See figure E-1.)

1-22. The fuel boost pump is an electric motor-driven pump mounted on the right side of the trailer. The boost pump

draws fuel from the fuel tank and routes it through the fuel filter to the fuel control on the APU. A minimum of 5 psig fuel

boost pressure is sufficient to ensure fuel flow to the fuel system of the APU.

1-23. FUEL FILTER. (See figure E-1.)

1-24. A replaceable element, low-pressure fuel filter is mounted on the right side of the trailer. A pressure relief valve

within the filter head assembly is set to relieve at 10 to 12 psi differential pressure. The filter provides 10-micron filtration

of the fuel before entry into the fuel system of the APU.

1-25. EXHAUST DUCT ASSEMBLY . (See figure E-1.)

1-26. The exhaust duct assembly is a welded assembly bolted to the frame at the forward end of the trailer. The exhaust

duct assembly consists of two duct halves, six support angles, and four mounting plates. The exhaust duct assembly

directs the APU exhaust and noise upward.

1-27 FIRE EXTINGUISHER. (See figure E-1.)

1-28. The portable, manually-operated, fire extinguisher is mounted in a support bracket at the aft, right end of the trailer,

and secured in place by a clamp attached to the fire extinguisher support bracket. The fire extinguisher is a 2.5 pound dry

chemical type extinguisher.

Change 2 E-9