Troubleshooting Checklist - Kohler Command CH20 Service Manual

TROUBLESHOOTING CHECKLIST

If engine starts hard, runs roughly, or stalls, check
following areas.
1. Make sure LPG fuel tank is fi lled and shut-off valve
is fully opened.
2. Make sure fuel is reaching carburetor.
3. Make sure air cleaner element and precleaner are
clean and all components are fastened securely.
Condition
Engine cranks but will not start. LPG fuel tank closed, low, or empty.
Hard starting, runs roughly, or
stalls at idle speed.
Irregular or inconsistent idle.
24 690 30 Rev. G
Lock-off not opening electrically, preventing fuel fl ow.
Fuel fi lter (located inside lock-off ) dirty or blocked.
Insuffi cient vacuum signal, regulator not opening.
● Vacuum line between carburetor and regulator cracked, leaking, kinked, or
pinched.
● Carburetor loose.
● Intake manifold loose or leaking.
● Excessive internal engine wear.
Faulty regulator.
● Primary valve not opening.
● Diaphragm spring adjustment incorrect.
● Idle adjustment screw incorrectly set.
● Vent(s) blocked/restricted.
Restricted/blocked fuel line.
Blocked carburetor fuel circuit.
Loose/leaking fuel enrichment hose (IMPCO carburetor system).
LPG fuel tank low.
Vacuum line between carburetor and regulator pinched, cracked, or leaking.
Carburetor idle speed set too low (should be at least 1200 RPM).
Carburetor idle circuit restricted.
Dirty/restricted air cleaner.
Dirty/restricted lock-off fi lter.
Frozen/malfunctioning regulator. Check/adjust primary pressure.
Excessive external load on engine.
Excessive internal wear.
Loose/leaking fuel enrichment hose (IMPCO carburetor system).
Improper operation/adjustment of regulator, idle adjustment screw, throttle
opening, and/or engine governor.
Secondary valve in regulator not closing. Readjust idle screw (counterclockwise)
so valve can close fully against seat.
Loose/leaking vacuum line.
Loose carburetor mounting and/or line connections.
Damaged diaphragm(s) within regulator.
Debris in regulator. Flush debris from drain plug or remove regulator from system,
disassemble body and remove debris.
Dirt or debris in carburetor. Remove carburetor, disassemble and clean/service as
required. If venturi (IMPCO carburetor) removal is performed, mark its orientation
to carburetor body for proper reinstallation.
Loose/leaking fuel enrichment hose (IMPCO carburetor system).
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4. Make sure ignition, governor, exhaust, throttle, and
choke control systems are all operating properly.
5. Check compression.
If engine continues to start hard, run roughly, or stall
after these checks have been made, use following
troubleshooting guide.
Conclusion
Fuel System
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