MARINE CORPS TM 6115-34/8
MAINTENANCE OF FUEL SYSTEM
6-1. PURPOSE AND FUNCTION OF FUEL
(4) Loosen and remove fuel level
The fuel system (figure 6-1)
gauge (3) from top of fuel tank.
providing a clean,
continuous flow of fuel to the fuel
electrical fuel transfer pump provides
a continuous fuel flow of 5-7 psi
(34-48 Pa) to the primary fuel (fluid)
The fuel is filtered in the
primary filter, then routed through the
secondary fuel (fluid) filter.
in engine speed are sensed at the
monopole speed sensor and a signal is
transmitted to the engine electronic
module (EECM), where fuel
signals are set to the electrical high
pressure fuel pump. High pressure fuel
then goes through the solenoid valve to
the fuel injection nozzle atomizers.
To prevent carbon and varnish deposits
in the turbine engine after engine
shutdown, the pressurized fuel supply
stopped and fuel between the
solenoid valve and the fuel injection
nozzle atomizers is discharged through
ENGINE FUEL TANK.
of the engine fuel tank (figure 6-2)
consists of repairing damaged welds and
replacing damaged components.
Removal and Disassembly.
accordance with paragraph 4-39d, TM
(2) Remove fill cap (1) from top
of fuel tank.
(3) Loosen and remove fuel tank
(5) On bottom of tank, loosen and
remove drain valve (4).
(6) Loosen and remove fuel line
To prevent injury, ensure that
fuel tanks are adhered to.
Repair damaged welds
Hydrostatically test fuel
tank to 7-8 psi (48.26-55.16 Pa). Hold
pressure for two minutes and make sure
there are no leaks and no drop in
(1) Apply pipe thread sealant to
male threads of fuel line connector.
Install connector in bottom of fuel
(2) Apply pipe thread sealant to
male threads of drain valve.
valve in bottom of fuel tank.
(3) Apply pipe thread sealant to
male threads of fuel
Install gauge in top of fuel tank.
(4) Apply pipe thread sealant to
male threads of fuel tank breather.
Install breather in top of fuel tank.
(5) Install fill cap.