Propane EFI System
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24 690 32 Rev. AKohlerEngines.com
2. Turn on key switch to activate lock-off and check system pressure on gauge. If system pressure of 26 psi ± 3 is
observed, wiring, lock-off, and regulator are working properly. Turn key switch OFF and observe system pressure.
System pressure should not drop more than 5 psi per minute. If it does drop more that this, a leak may be present
in system and should be investigated. If system pressure is OK, depress valve button on tester to relieve system
pressure.
a. If pressure is too high or too low, replace regulator.
3. If lock-off did not activate (step 2), disconnect plug from lock-off. Connect a DC voltmeter across terminals in plug,
turn on key switch and observe if a minimum of 7 volts is present during six second prime process.
4. If no voltage is observed, connect red lead of meter to red wire of plug and black lead to a good ground while key
is still ON.
5. If voltage is between 7 and 14, turn key switch OFF and connect an ohmmeter between terminals on lock-off to
check for continuity.
a. If there was no continuity between lock-off terminals, replace lock-off valve.
b. If voltage was below 7, test wiring harness and battery.
6. If voltage at plug was good, and there was continuity across lock-off terminals, reconnect plug to lock-off, making
sure you have a good connection. Turn on key switch and listen for lock-off to activate.
a. If lock-off clicks, repeat steps 1 and 2 to verify correct pressure.
b. If lock-off still does not operate, replace it.
Regulator Maintenance
Drain Accumulated Deposits
Over time, depending on fuel quality, operating environment, and system performance, fuel deposits can accumulate
inside regulator. Perform following steps to remove any accumulated deposits.
1. Turn supply valve off, run engine out of fuel, and turn off ignition switch.
2. Disconnect and ground spark plug leads.
3. Remove brass plug from bottom of regulator and drain any accumulated deposits.
4. Inspect O-ring on plug; replace if damaged.
5. Reinstall plug and tighten securely.
Replace 30-Micron Button Filter
Remove inlet fi tting w/O-ring, button fi lter and gasket. Discard fi lter, gasket, and O-Ring. Position new gasket into
regulator, install button fi lter (large end in). Install new O-ring on inlet fi tting. Reinstall inlet fi tting and torque to 20 N·m
(177 in. lb.).
Lock-Off Assembly
1. Disconnect plug from lock-off. Remove nut and lock-off. Remove lock-off valve body and plunger. Discard all
parts.
2. Install plunger, then lock-off valve body. Torque body to 20 N·m (177 in. lb.).
3. Install lock-off assembly and nut. Torque nut to 6.5 N·m (57 in. lb.).
4. Reconnect plug to lock-off.
High Pressure Fuel Line
High pressure fuel line is mounted to intake manifold. No specifi c servicing is required unless operating conditions
indicate that it needs replacement. Thoroughly clean area around all joints and relieve any pressure before starting
any disassembly. Detach by removing two mounting screws, wire ties, and injector retaining clips.
Vacuum Reference Line
No specifi c servicing is required for vacuum line unless operating conditions indicate replacement is required. All
components are serviced individually. Abrasion sleeves on hoses should be reused or replaced when servicing
vacuum line. Please note routing and replicate after service or component replacement to prevent pinching or
abrasion of line. Only Kohler replacement parts can be used because vacuum line is specifi c to system and must be
maintained. Visit KohlerEngines.com for recommended Kohler replacement parts.
Throttle Body/Intake Manifold Assembly
NOTE: ECU Reset is required if throttle body is replaced.
Throttle body is serviced as an assembly, with throttle shaft, TPS, throttle plate, and idle speed adjusting screw
installed. Throttle shaft rotates on needle bearings (non-serviceable), capped with seals to prevent air leaks.
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