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 TM 55-1905-221-14-2
5-17. 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 with 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 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 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.
5-384
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