Fuel System Tests - Kohler Command Pro CV173 Service Manual

Fuel System
Typical carbureted fuel system and related components include:
● Fuel tank (if equipped).
● Fuel line.
● In-line fuel fi lter (if equiped).
● Fuel tank fi lter (in-nipple).
● 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 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 tests.
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
Fuel at tip of spark plug.
No fuel at tip of spark plug.
Fuel fl ows from fuel line.
No fuel fl ow from fuel line.
Fuel line condition.
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Fuel is reaching combustion chamber.
Check fuel fl ow from fuel tank (step 2).
Check for faulty carburetor, refer to Carburetor.
Check fuel tank vent, outlet fi lter threaded into tank, and
fuel line. Correct any observed problem and reconnect
line.
Check for clogged fuel line.
KohlerEngines.com
Conclusion
14 690 12 Rev. --