Maintenance of Fuel System

3-11. Maintenance of Fuel System

(3) Remove the wing nut (5) with its assembled

washer gasket (6) and remove the element (7) from the

a. Lines and Fittings. Normal operation of the

air cleaner body (8).

pump and engine requires no lines and fittings

b. Cleaning and Inspection.

maintenance other than tightening loose connections.

CAUTION

b. Tank.

WARNING

Do not use gasoline or other solvents for

cleaning the air cleaner element.

Clean all parts in a well-ventilated area.

Avoid inhalation of solvent fumes and

CAUTION

prolonged exposure of skin to cleaning

Mechanical drying methods can be used to

solvent. Wash exposed skin thoroughly.

dry a washed element providing that the

Dry cleaning solvent (fed. spec. P-D-680)

heated air does not exceed a temperature of

used to clean parts is potentially dangerous

180 F with the air under constant

to personnel and property. Do not use near

circulation. Do not attempt to use light

open flame or excessive heat. Flash point of

bulbs to dry element.

solvent is 100 to 138 F (38 to 59 'C).

(1) To clean the air cleaner element, use a 1/8-

inch air nozzle with 100 psi maximum compressed air,

(1) If the fuel inlet strainer becomes clogged,

blowing from the inside toward the outside until all dust

remove the filler cap and pull the strainer out of the filler

is removed.

neck. Clean it with a soft brush and dry cleaning solvent

(2) An alternate method of cleaning the element

(fed. spec. P-D-680). Allow strainer to dry thoroughly

is to wash it with a non-sudsing detergent in a container

before installing it in the fuel tank.

large enough to immerse the element. Allow it to soak

(2) If the fuel becomes contaminated with dirt or

for 10 minutes minimum and agitate it for 2 minutes to

water, drain the tank as follows:

dislodge all dirt. Rinse with clean water, using a

(a) Open the filler cap.

pressure hose from a tap with pressure of less than 40

(b) Place a container of suitable size under

psi. Air dry thoroughly before reinstallation.

the drain plug on the bottom rear of the tank. Remove

(3) Insert a light bulb in the cleaned element and

the plug and drain the contaminated fuel. Flush the tank

carefully check for holes, cracks, or ruptures. Any hole

with a small amount of clean fuel.

in the element will necessitate element replacement. A

hole, no matter how small, will cause unnecessary

fresh fuel, and replace the filler cap. Dispose of the

engine wear.

contaminated fuel.

c. Installation.

c. Fuel Strainer Service. If moisture or other

(1) Install the element (7, fig. 3-5) in the air

contaminants are visible through the glass bowl of the

cleaner body (8). Check that the washer gasket (6) on

fuel strainer, service the fuel strainer as follows:

the wing nut (5) is in good condition; secure the element

(1) Close the shutoff valve (6, fig. 3-6) on the

to the body with the wing nut.

fuel strainer.

(2) Install the flexible baffle (4) in the cleaned

dust cup (3), and install the parts on the body. Secure

by tightening the wing screw on the clamp assembly (2).

3-11