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FUEL SYSTEM/CARBURETION
4.17
FUEL PUMP EXPLODED VIEW
Fuel Pump Exploded View at Right
3
2
1
5
5
4
1. Fuel Pump Assembly
2. Diaphragm, Gasket Set
3. Screw and Washer Assembly
4. Screw and Washer Assembly
5. Screw and Washer Assembly
6. Pressure Regulator
7. Fuel Inlet
8. Fuel Outlet
6
8
7
TROUBLESHOOTING
FUEL STARVATION/LEAN MIXTURE
Symptoms: Hard start or no start, bog, backfire,
popping through intake / exhaust, hesitation,
detonation, low power, spark plug erosion, engine
runs hot, surging, high idle, idle speed erratic.
G No fuel in tank
G Restricted tank vent, or routed
improperly
G Fuel lines or fuel valve restricted
G Fuel filter plugged
G Carburetor vent line(s) restricted
G Plugged or restricted inlet needle
and seat screen or inlet passage
G Clogged jets or passages
G Float stuck, holding inlet needle
closed or inlet needle stuck
G Float level too low
G Fuel pump inoperative
G Air leak at impulse line
G Restricted impulse line (kinked,
pinched)
G Intake air leak (throttle shaft, intake
ducts, airbox or air cleaner cover)
G Ruptured vacuum slide diaphragm,
Vacuum slide stuck closed or sticky
G Improper spring
G Jet needle position incorrect
G Incorrect pilot screw adjustment
RICH MIXTURE
Symptoms: Fouls spark plugs, black, sooty exhaust
smoke, rough idle, poor fuel economy, engine runs
rough/ misses, poor performance, bog, engine loads
up, backfire.
G Air intake restricted (inspect intake
duct)
G Air filter dirty/plugged
G Choke plunger sticking, incorrectly
adjusted choke
G Choke cable binding or improperly
routed
G Incorrect pilot air/fuel screw
adjustment
G Faulty inlet needle and seat
G Faulty inlet needle seat O-Ring
G Float level too high