Service manual

Fuel System
2162 690 01 Rev. C KohlerEngines.com
Typical carbureted fuel system and related components
include:
● Fuel tank and valve.
● Fuel lines.
● In-line fuel fi lter.
● Fuel pump.
● Carburetor.
Fuel from tank is moved through in-line fi lter and fuel
lines by fuel pump. Fuel then enters carburetor fl oat bowl
and is drawn into carburetor body and 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 PUMP
These engines use either a mechanical fuel pump, or
optional remote-mounted electric fuel pump assembly.
Operation of mechanical fuel pump occurs by direct
lever/pump actuation off rocker arm movement. Pumping
action causes diaphragm on inside of pump to pull fuel in
on its downward stroke and to push it into carburetor on
its upward stroke, internal check valves prevent fuel from
going backward through pump.
Fuel Pump Replacement
Mechanical fuel pump is an integral part of valve cover
assembly and not serviced separately.
1. Disconnect fuel lines from inlet and outlet fi ttings.
Note orientation.
2. Follow procedure for replacing valve cover. Refer to
Disassembly and Reassembly.
3. Reconnect fuel lines to inlet and outlet fi ttings and
secure with clamps.
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 leads.
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 fuel pump.
a. Remove fuel line from inlet fi tting of fuel pump.
b. Hold line below bottom of tank. Open shut-off
valve (if equipped) and observe fl ow.
3. Check operation of fuel pump.
a. Remove fuel line from inlet fi tting of carburetor.
b. Crank engine several times and observe 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 fuel pump (step 3).
If fuel pump is working, check for faulty carburetor. Refer
to Carburetor.
No fuel fl ow from fuel line. Check fuel tank cap vent, fuel pickup screen, in-line
fi lter, shut-off valve, and fuel line. Correct any observed
problem and reconnect line.
Fuel line condition. Check for a clogged fuel line. If fuel line is unobstructed,
check for overfi lled crankcase and/or oil in pulse line. If
checks don't reveal cause of problem, replace pump.