TM 5-4520-244-14
HOW THE HEATER FUEL SYSTEM OPERATES
3.
NOZZLE
2.
HEATER FUEL PUMP
ENGINE
1.
Fuel sprays
Belt driven by engine.
Fuel pump on
out from
Runs continuously.
gasoline engine
nozzle and
Delivers fuel to
draws fuel from
is ignited
nozzle for burning
tank to run
by igniter
to produce heat.
engine.
plug.
TEMPERATURE
SELECTOR
TEMPERATURE
5..
VALVE
SELECTOR
SECONDARY BYPASS LINE
6.
VALVE
Pump supplies more fuel
Adjusts fuel
than needed for full flow
flow thru
thru nozzle.
CHECK VALVE
4.
nozzle.
Excess returns to tank
Allows flow
VALVE CLOSED:
thru secondary bypass
only in
Full flow thru
line.
direction
nozzle.
shown by
VALVE OPEN:
arrow.
Fuel goes back
7.
into tank.
FUEL CONTROL VALVE
Turns heater flame on and off.
VALVE OPEN: Fuel goes into
tank, not to nozzle.
VALVE CLOSED: Fuel goes to
nozzle for burning.
Fuel System Operation
F i g u r e 1-4.
1-8
