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TM 5-4110-217-14
Replace  defective  parts  with  new  items  during
tion at no load can sometimes be corrected by an idle
reassembly.
adjustment.
c.  Reassembly and Installation.
(1) Screw head casting (11) on carburetor
3-27.
Fuel Pump.
nipple (15).
a.
Electric pump removal.
(2) Place gasket (13), filter screen (12), and
(1) Be sure power switch is in "OFF" position.
bowl (14), in place. Swing bail in place and tighten star
(2) Disconnect power lead to pump.
nut.
(3) Disconnect fuel lines at pump.
(3) Connect fuel pump line (3) at fuel filter
(4) Remove (2) mounting bolts from bracket.
(10).
(5) Remove pump from unit.
(4) Turn fuel shutoff valve on fuel filter (10)
b.  Installation.
counterclockwise to full open position.
(1) Position new pump on unit.
(2) Install mounting bolts (2).
3-26.
Carburetor.
(3) Hook up fuel lines. Be sure line from fuel
tank hooks to inlet side of pump.
(4) Hook power lead to pump.
CAUTION
When adjusting carburetor, be very
3-28.
Fuel Lines and Fittings.
careful  not  to  touch  exhaust
a.
Removal (fig. 3-10)
manifold. Painful burns will result.
(1) Remove  drain  plug  (18)  and  drain
gasoline tank (1) of fuel.
a.
Removal (fig. 3-11).
(2) Disconnect and remove fuel pump-to-
(1) Remove air cleaner (para. 3-2), fuel filter
engine pump line (3) Disconnect and remove fuel tank-
(para 3-25) and breaker mechanism box (para. 3-44).
to-fuel pump line (2).
(2) Loosen screw (65) to release choke
(3) Unscrew fitting (9) and nipple (15).
control link (66) at sisson choke lever.
(4) Unscrew filter sediment bowl (14) from
(3) Remove clip (76) to release throttle link
fuel filter assembly (10).
(75) at carburetor (52).
b.  Cleaning and Inspection
(4) Remove two screws (53) and lockwashers
(1) Clean all lines and fittings and filter
(54) that attach carburetor (52) to intake manifold (110).
sediment bowl in an approved cleaning solvent.  Use
(5) Remove  carburetor  and  carburetor
compressor air to blow all dirt and sludge from fuel
mounting gasket (52A). Remove choke control link from
passages.  Dry external surfaces with clean, lint-free
carburetor.
cloth.
b.  Installation.
(2) Inspect fuel lines for cracks, dents, and
(1) Align holes in carburetor mounting gasket
other damage. Pay particular attention to root of flare.
(52A) and throttle body with holes in intake manifold
Check fittings and shut-off valve for damage threads and
(110). Attach carburetor (52) to intake manifold with two
other defects. Check operation of fuel shut-off valve on
screws (53) and lockwashers (54).
fuel filter assembly. Replace all defective parts.
(2) Assemble clip to throttle link (66) in hole of
c.  Installation (fig. 3-10).
carburetor choke lever.
(1) Install filter sediment bowl (14) to fuel filter
(3) Insert end of choke control link (66) in
assembly (10).
hole of carburetor choke lever.
(2) Connect fuel pump line (3) to fitting (9) to
(4) Put choke control link (66) straight end in
fuel filter assembly (10).
sisson choke lever hole and secure with screw (65).
(3) Install nipple (15) between fuel filter
(5) Assemble breaker box (95), fuel filter (56)
assembly (10) and carburetor (16).
and air cleaner (1), (para 3-2, 3-25, 3-44).
(4) Connect fuel tank-to-fuel pump line (2).
c.  Idle Needle Adjustment.
(5) Screw in drain plug (18) to gasoline tank
(1) When adjusting the idle jet needle, the
(1).
engine  should  be  running  at  normal  operating
temperature and without a load connected.
3-29.
Sisson Choke (Fig. 3-12).
(2) Turn the idle adjusting needle in until the
a.  The sisson choke should not require any
engine loses considerable speed. Then turn it out until
seasonal adjustment. If adjustment becomes necessary,
the engine runs smoothly. A hunting condi-
pull choke lever up and insert a 1/16-inch diameter rod
through shaft hole (opposite end from
Change 3 3-15

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