Kohler KS540 [29/92] Fuel system

29

Fuel System

22 690 01 Rev. -- KohlerEngines.com

Troubleshooting-Carburetor Related Causes

Condition Possible Cause Conclusion

Engine starts hard, runs rough, or

stalls at idle speed.

Low idle fuel mixture/speed

improperly adjusted.

Adjust low idle speed screw, then

adjust low idle fuel needle.

Improper choke adjustment. Correct choke adjustment.

Engine runs rich (indicated by black,

Choke partially closed during

Check choke lever/linkage to ensure

Bowl vent or air bleeds plugged. Remove fuel bowl. Clean vent, ports,

and air bleeds. Blow out all passages

with compressed air.

Fuel bowl O-ring leaks. Remove fuel bowl and replace

O-ring.

Leaky, cracked, or damaged fl oat. Submerge fl oat to check for leaks.

Engine runs lean (indicated by

misfi ring, loss of speed and power,

governor hunting, or excessive

throttle opening).

Idle holes plugged; dirt in fuel

delivery channels.

Remove fuel bowl. Clean main fuel

jet and all passages; blow out with

compressed air.

Bowl retaining screws loose. Torque screws to 4.0 N·m (35 in. lb.).

FUEL SYSTEM

Fuel Shut-off Solenoid

Most carburetors are equipped with a fuel shut-off solenoid. Solenoid is attached to fuel bowl. Solenoid has a spring-

loaded pin that retracts when 12 volts is applied to lead, allowing fuel fl ow to main jet. When current is removed, pin

extends blocking fuel fl ow.

Below is a simple test, performed with engine off , that can determine if solenoid is functioning properly:

1. Shut off fuel and remove solenoid from carburetor. When solenoid is loosened and removed, gas will leak out of

carburetor. Have a container ready to catch fuel.

2. Wipe tip of solenoid with a shop towel or blow with compressed air to remove any remaining fuel. Take solenoid to