Engine Service Manual

26
Fuel System
KohlerEngines.com 17 690 01 Rev. J
Typical carbureted fuel system and related components
include:
● Fuel tank.
● Fuel lines.
● In-line fuel fi lter.
● Fuel tank fi lter.
● Carburetor.
● Fuel strainer screen in carburetor.
FUEL RECOMMENDATIONS
Refer to Maintenance.
FUEL LINE
Low permeation fuel line must be installed on carbureted
Kohler Co. engines to maintain EPA and CARB
regulatory compliance.
FUEL FILTER
Fuel Tank Filter (if equipped)
A serviceable fuel tank fi lter is located under fuel tank
cap, in fi ller neck.
Daily or as required clean fi lter of any accumulation as
follows:
1. Remove fuel tank cap and fi lter.
2. Clean fi lter with solvent, replace if damaged.
3. Wipe fi lter and insert it.
4. Tighten fuel tank cap securely.
Fuel Valve
WARNING
Explosive Fuel can cause fi res and severe
burns.
Do not fi ll fuel tank while engine is hot or
running.
Gasoline is extremely fl ammable and its vapors can
explode if ignited. Store gasoline only in approved
containers, in well ventilated, unoccupied buildings,
away from sparks or fl ames. Spilled fuel could ignite
if it comes in contact with hot parts or sparks from
ignition. Never use gasoline as a cleaning agent.
NOTE: Models with a low-profi le air cleaner do not have
fuel valve.
1. Stop engine.
2. Remove securing hardware and carburetor cover
panel.
3. Turn fuel valve lever to OFF position.
4. Remove fuel valve cup.
5. Clean fuel valve cup with solvent and wipe it off.
6. Check O-ring, replace if damaged. Check screen for
blockage or damage, replace if necessary. New
screen must be located on pick-up tube.
7. Place O-ring on screen followed by fuel valve cup.
Rotate fuel valve cup until it is fi nger tight. Turn with
a wrench 1/2 to 3/4 turn.
8. Turn fuel valve to ON position and check for leaks. If
fuel valve cup leaks repeat step 7.
9. Reinstall carburetor cover panel, using hardware
removed in step 2 to secure.
FUEL SYSTEM TESTS
When engine starts hard, or turns over but will not start, fuel system might be causing problems. Test fuel system by
performing following test.
1. Check for fuel in combustion chamber.
a. Disconnect and ground spark plug lead.
b. Close choke on carburetor.
c. Crank engine several times.
d. Remove spark plug and check for fuel at tip.
2. Check for fuel fl ow from tank to carburetor.
a. Remove fuel line from inlet fi tting of carburetor.
b. Use an approved fuel container to catch fuel, and
hold line below bottom of tank to observe fuel
fl ow.
3. Check operation of fuel shut-off valve.
a. Remove fuel sediment bowl under inlet fi tting of
carburetor.
b. Turn fuel shut-off valve ON and OFF and observe
operation.
Condition Conclusion
Fuel at tip of spark plug. Fuel is reaching combustion chamber.
No fuel at tip of spark plug. Check fuel fl ow from fuel tank (step 2).
Fuel fl ows from fuel line. Check operation of fuel shut-off valve (step 3).
No fuel fl ow from fuel line. Check fuel tank vent, in-line fi lter threaded into tank, and
fuel line. Correct any observed problem and reconnect
line.
Fuel fl ows from valve. Check for dirt and water in sediment bowl and screen.
Clean bowl and screen as needed. Check for faulty
carburetor, refer to Carburetor.
No fuel fl ows from valve. Check for a restriction in fuel shut-off valve or inlet elbow.