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 TM 55-1905-221-14-1
4-50. FUEL PUMP.
a. The positive displacement gear-type fuel pump transfers the fuel from the supply tank to the fuel injectors. The
pump circulates an excess supply of fuel through the injectors which purges the air from the system, and cools the
injectors. The unused portion of fuel returns to the fuel tank by means of a fuel return manifold and fuel return line.
b. The pump is attached to the rear end plate cover of the blower assembly wtih three bolt and seal assemblies.
The seals are flat, soft copper washers which prevent the oil in the blower cover from seeping out around the bolt
threads. The pump is driven off the end of the blower's lower rotor by means of a drive coupling fork attached to the end
of the pump drive shaft and mating with a drive disc attached to the blower rotor.
c. Fuel pumps are furnished in the left-hand, or right-hand rotation, according to the engine model, and are
stamped, "LH IN", or "RH IN". The left-hand pumps are used on LB-RB engines, while the right-hand pumps are used on
LD-RD engines. These pumps are not interchangeable, nor can a pump made for one rotation be rebuilt for the other
rotation since the relief valve can be installed in only one position in the pump body. The pump must always be installed
with the inlet opening in the pump cover (marked "LH IN", or "RH IN"), on the side toward the cylinder block.
4-187
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