with an approved cleaning solvent. Remove lockwires
Caution: Many solvent cleaners are injurious to
aluminum. Make sure your cleaner is suitable before
using it on aluminum.
Figure 3-3. Diode rectifier test
Figure 3-4. Fuel pump return line removal.
3-2. Fuel Pump Assembly
(1) The fuel pump consists of a shut down
valve, pulsation damper, front drive cover, governor
plunger, throttle assembly, gear pump, governor spring
(2) The gear pump section of the fuel pump
draws fuel from the fuel tank and delivers it, under
pressure, to the injector supply manifold under control of
the governing and metering sections of the fuel pump. In
this manner, the speed of the engine is controlled by the
fuel pump which, in turn, controls the supply of fuel to the
(3) Remove fuel pump mounting capscrews
and lockwashers and lift fuel pump from engine (fig. 3-
Figure 3-5. Fuel supply line disconnection.
Remove and discard buffer from
(1) Clean and mount.
(a) Clean outside of fuel pump thoroughly