TM 5-4240-501-148P
CARBURETION
Pulsa-Jet
Fig. 46 - Removing and Inserting Spiral
Fuel Pipe
Check balls are not used in these fuel pipes. The screen
housing or pipe must be replaced if the screen can not
be satisfactorily cleaned. The long pipe supplies fuel
from the tank to the pump. The short pipe supplies fuel
from the tank cup to the carburetor. Fig. 47. Fuel pipes
are nylon or brass. Nylon pipes are removed and
replaced by using a 6 point socket, or open end wrench.
Fig. 48. WHERE BRASS PIPES ARE USED, THE
SCREEN HOUSING ONLY IS REPLACED. Fig. 49.
Clamp the fuel pipe in a vise (do not overtighten). Drive
off the brass housing with a screw driver. The new
housing is installed by tapping it on the pipe with a soft
hammer, Fig. 49.
Fig. 47 - Fuel Pipes
Fig. 48 - Replacing Fuel Pipe
Fig. 49 - Replacing Screen Housing Assembly
Needle Valve and Seat
Remove needle valve to inspect. If carburetor is gummy
or dirty, remove seat to allow better cleaning of metering
holes. Fig. 50. Do not resize metering holes.
Fig. 50 - Metering Holes
Pump Disassembly and Repair
Remove fuel pump cover, diaphragm, spring and cup.
Fig. 51. Inspect diaphragm for punctures, cracks and
fatigue. Replace if damaged. Current style supersedes
the previous style. When installing the pump cover,
tighten the screws evenly in staggered sequence to
insure a good seal Inspect all sealing surfaces for nicks
or damaged and repair or replace as required.
Fig. 51 - Pulsa-Jet Carburetor
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