Cessna 150 Series Service Manual page 152

SECTION 12
FUEL SYSTEM
TABLE OF CONTENTS Page
FUEL SYSTEM.
.............. . 12-1 Checking .. ......... . 12-7
Description ............. . 12-1
Fuel Shut-Off Valve. ........... 12-7
Precautions .............. 12-1 Description ............ 12-7
Trouble Shooting ........... . 12-2
Removal and Installation . .... 12-7
Fuel Tanks. ...............
12-7 Fuel Strainer. ............. 12-7
Description ............ 12-7 Description ...........
. 12-7
Removal and Installation . ..... 12-7
Disassembly and Assembly ..... 12-7
Fuel Quantity Transmitters .......
12-7 Priming System ............ 12-8
Fuel Vents ............... 12-7
Description ............ 12-8
Description ...........
12-7 Removal and Installation ...... 12-8
12-1. FUEL SYSTEM. to a suitable ground stake.
b. Residual fuel draining from lines and hose con-
12-2. DESCRIPTION. Fuel is gravity-fed from the stitutes a fire hazard. Use caution to prevent the
metal wing tanks, through a shut-off valve and a fuel accumulation of fuel when lines or hose are discon-
strainer, to the carburetor. Positive ventilation is nected.
provided by a vent line and check valve assembly lo- c. Cap open lines and cover connections to prevent
cated in the left wing tank and a crossover line con-
thread damage and the entrance of foreign matter.
necting the two tanks together. The vent line from
the check valve assembly extends overboard through NOTE
the lower wing skin adjacent to the left wing strut.
A fuel line drain is located between the shut-off valve Throughout the aircraft fuel system, from
and the strainer. the tanks to the carburetor, use NS-40
(RAS-4) (Snap-On-Tools Corp., Kenosha,
12-3. PRECAUTIONS. Wisconsin), MIL-T-5544 (Thread Compound
Antiseize, Graphite Petrolatum), USP Petro-
NOTE latum or engine oil as a thread lubricator or
to seal a leaking connection. Apply sparing-
There are certain general precautions and rules ly to male threads only, omitting the first
concerning the fuel system which should be ob-
two threads, exercising extreme caution
served when performing the operations and pro- to avoid "stringing" sealer across the end
cedures in this section.
These are as follows: of the fitting. Always ensure that a compound,
the residue from a previously used compound,
a. During all fueling, defueling, tank purging, and or any other foreign material cannot enter the
tank repairing or disassembly, ground the aircraft system.
12-1