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10.1 FUEL SYSTEM TROUBLESHOOTING
The following troubleshooting chart is to be used to
isolate fuel system problems and give possible causes
and corrective action responses. The troubleshooting
key is generic and can be used for several types of
engines. Use only those possible causes and
corrective actions that apply to the unit.
SECTION 10 - FUEL SYSTEM
TROUBLE POSSIBLE CAUSES
(Refer to Key Below)
CORRECTIVE ACTION
Hard Starting 1, 3, 4, 6, 11, 12, 14, 16, 17, 18 clean, repair or replace
Fuel Leak At Carburetor 5, 7, 17 repair or replace
Engine Floods 5, 15, 17 repair or replace
Will Not Idle 1, 2, 3, 6 repair or replace
Rich Idle 1, 6, 14 repair or replace
Idles With Needle Closed 14 repair or replace
Hunts Erratic Idle 2, 3, 6, 7, 12, 13, 14, 15, 18 repair or replace
Idles Fast Lean 2, 3, 7, repair or replace
Will Not Accelerate 1, 6, 12, 14, 15, 16 repair or replace
Over Rich Acceleration 1, 15 repair or replace
Hesitates 2, 6, 11, 12, 16 repair or replace
Will Not Run at High Speed 1, 11, 12, 14, 16 repair or replace
Low Power 1, 3, 11, 14, 15, 16, 17, 18 repair or replace
Hunts at High Speed 3, 6, 7, 12, 14, 15, 16, 18 repair or replace
Runs With Needle Closed 14 repair or replace
Engine Overspeeds 2, 3, 7, 14 repair or replace
TROUBLESHOOTING KEY
1 Plugged air filter 7 Damaged or leaky "O" rings 13 Idler port restricted
2 Leaky carburetor gasket 8 Damaged diaphragm 14 Damage adjustment needle and seat
3 Throttle or choke shaft worn 9 Stuck or dirty ball check 15 Incorrect float height
4 Choke not functioning properly 10 Diaphragm upside down 16 Main nozzle restricted
5 Plug atmospheric vent 11 Plugged tank or vent 17 Dirty, stuck needle and seat
6 Air bleed restricted 12 Fuel pick-up restricted 18 Fuel inlet plugged