ARMY
TM 5-6115-612-34
MARINE CORPS TM 6115-34/8
AIR FORCE
TO 35C2-3-471-2
NAVY
AG-320BO-MME-OOO
CHAPTER 6
MAINTENANCE OF FUEL SYSTEM
6-1. PURPOSE AND FUNCTION OF FUEL
SYSTEM.
(4) Loosen and remove fuel level
The fuel system (figure 6-1)
gauge (3) from top of fuel tank.
is an
electronically
actuated and
controlled system,
providing a clean,
continuous flow of fuel to the fuel
injection
nozzle
atomizers.
The
electrical fuel transfer pump provides
a continuous fuel flow of 5-7 psi
(34-48 Pa) to the primary fuel (fluid)
filter.
The fuel is filtered in the
primary filter, then routed through the
secondary fuel (fluid) filter.
Changes
in engine speed are sensed at the
monopole speed sensor and a signal is
transmitted to the engine electronic
control
module (EECM), where fuel
quantity
is determined
and demand
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
is
stopped and fuel between the
solenoid valve and the fuel injection
nozzle atomizers is discharged through
the
solenoid
valve
outside
the
generator set.
6-2.
ENGINE FUEL TANK.
Maintenance
of the engine fuel tank (figure 6-2)
consists of repairing damaged welds and
replacing damaged components.
a.
Removal and Disassembly.
(1) Remove
fuel
tank
in
accordance with paragraph 4-39d, TM
5-6115-612-12.
(2) Remove fill cap (1) from top
of fuel tank.
(3) Loosen and remove fuel tank
breather (2).
(5) On bottom of tank, loosen and
remove drain valve (4).
(6) Loosen and remove fuel line
connector (5).
WARNING
To prevent injury, ensure that
correct procedures
for welding
fuel tanks are adhered to.
b. Repair.
Repair damaged welds
and
replace
damaged
components as
necessary.
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
pressure.
c.
Insta llation.
(1) Apply pipe thread sealant to
male threads of fuel line connector.
Install connector in bottom of fuel
tank.
(2) Apply pipe thread sealant to
male threads of drain valve.
Install
valve in bottom of fuel tank.
(3) Apply pipe thread sealant to
male threads of fuel
level gauge.
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.
(6) Install
fuel
tank
on
generator
set in
accordance
with
paragraph 4-39e,
TM 5-6115-612-12.
6-1
