(2)
Inspect the filter bowl, element, and spring,
The electro-mechanical fuel system operates in
for cracks, tears, or other defects that would
conjunction with the heater electrical system to provide a
cause leaks. Replace gaskets.
constant flow of liquid fuel to the burner for combustion.
The fuel pump supplies fuel at low-pressure to the
c.
Installation.
regulator valve. A bleeder valve is installed at the top of
(1) Position the gasket (17) on the filter bowl
the control box to permit bleeding the air from the fuel
(16).
system at initial startup of the heater, or following long
(2) Install the filter spring (18) and filter strainer
periods of shutdown. The fuel filter consists of a filter
(19) in the filter bowl.
bowl and element, through which the fuel is pumped by
(3) Install the filter bowl (16) on the fuel pump
the action of the fuel pump.
filter head (1).
(4) Push the heater slide tray (9) into recessed
149. Servicing Heater Fuel Pump Filter
position and secure with the locking bolt
a. Removal.
(13).
(1) Pull the heater shelf locking bolt (13, fig. 40)
(5) Connect the quick-disconnect coupling fuel
upward and pull the heater slide tray (9) out.
line.
(2) Disconnect the quick disconnect coupling
(6) Check the fuel filter for le ks.
a
fuel line.
(3) Unscrew the filter bowl (16) and remove.
150. Bleeding Heater Fuel System
(4) Remove the filter spring (18) and the filter
a. Open the bleed valve (4, fig. 40) at the top of the
strainer (19).
control box.
(5) Remove the gasket (17) from the bowl;
b. Move the heater control switch (11) to the ON-
b. Cleaning, Inspection, and Repair.
LOW position.
(1) Clean the bowl, strainer, and spring in an
c. Allow the heater to operate until air bubbles no
approv ed cleaning solvent.
longer appear at the bleed valve.
d. Dry all heater surfaces and close the bleed valve.
Section II. ALCOHOL DISPENSER
(2)
Disconnect the air line (1, fig. 41) at the
151. Description
alcohol dispenser by disconnecting the
The alcohol dispenser is bracket mounted, to the
adapter (8). Disconnect the air hose (10) at
lubricating unit frame, and is used to prevent the freezing
the alcohol dispenser by disconnecting the
of condensed air in the air lines at freezing temperatures.
adapter (8) from the hose connection (9).
The alcohol dispenser consists of a head assembly and a
(3) Remove the two cap screws (2) which
replaceable metal bowl.
In operation, alcohol flow,
secures the alcohol dispenser and mounting
controlled by the needle valve (4, fig. 41), is injected into
bracket (3) to the lubricating unit frame.
the pneumatic system. Failure of alcohol flow is usually
due to the presence of dirt or other impurities in the fluid
(4) Remove the alcohol dispenser.
passage.
b. Disassembly.
(1) Remove the six screws (13) which secure
152. Servicing Alcohol Dispenser
the bowl (11) and ring clamp (12) to the top
assembly (14).
a. Removal.
(2) Remove the two adapters (8).
(1) Close the master control valve (2, fig. 8) on
the air receiver tank (10).
(3) Remove the bowl, ring camp, and bowl
l
gasket.
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