Product Manual B

20
Fuel System
KohlerEngines.com 18 690 06 Rev. B
Typical carbureted fuel system and related components
include:
● Fuel tank.
● Fuel lines.
● Fuel tank fi lter (outlet fi tting).
● Carburetor.
Fuel tank outlet is located above carburetor inlet,
allowing gravity to feed fuel through in-line fi lter and fuel
line to carburetor.
Fuel then enters carburetor fl oat bowl. Fuel is drawn
into carburetor body and is mixed with air. This fuel-air
mixture is then burned in engine combustion chamber.
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
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.
Filter is in tank outlet fi tting. Remove fuel tank from
engine. Remove outlet fi tting from fuel tank. Check
condition and replace if required. Torque fi tting to
2.0 N·m (17.7 in. lb.). Reinstall fuel tank, connecting all
fuel lines; torque screws to 4.5 N·m (40 in. lb.).
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.
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 for faulty carburetor, refer to Carburetor.
No fuel fl ow from fuel line. Check fuel tank vent, outlet fi lter threaded into tank, and
fuel line. Correct any observed problem and reconnect
line.
Fuel line condition. Check for clogged fuel line.