5.3
Section 5
Fuel System and Governor
NOTE: Make sure the orientation of the new
pump is consistent with the removed
pump. Internal damage may occur if
installed incorrectly.
5. Connect the pulse line between the pump and
crankcase.
6. Torque the hex. flange screws to 2.3 N·m
(20 in. lb.).
7. Connect the fuel lines to the inlet and outlet
fittings.
Carburetor
General
Engines in this series are equipped with Nikki or Keihin
fixed main jet carburetors. Some applications utilize a
fuel shut-off solenoid installed in place of the fuel bowl
retaining screw, and also an accelerator pump. All
carburetors feature the self-relieving choke
components shown in the exploded view on page 5.9.
These carburetors include three main circuits, which
function as follows.
Float Circuit: The fuel level in the bowl is maintained
by the float and fuel inlet needle. The buoyant force of
the float stops fuel flow when the engine is at rest.
When fuel is being consumed, the float will drop and
fuel pressure will push the inlet needle away from the
seat, allowing more fuel to enter the bowl. When
demand ceases, the buoyant force of the float will
again overcome the fuel pressure and stop the flow.
Figure 5-1. Pulse Pump Connections.
Performance
Minimum fuel delivery rate must be 7.5 L/hr. (2 gal./hr.)
with a pressure at 0.3 psi and a fuel lift of 24 in. A 1.3
L/hr. (0.34 gal./hr.) fuel rate must be maintained at
5 Hz.
Replacing the Fuel Pump
Replacement pumps are available through your source
of supply. To replace the pulse pump follow these
steps. Note orientation of pump before removing.
1. Disconnect the fuel lines from the inlet and outlet
fittings.
2. Remove the hex. flange screws (securing pump)
and fuel pump.
3. Remove the pulse line that connects the pump to
the crankcase.
4. Install a new pump using the hex. flange screws.
Pulse Line
Outlet Line (to
Carburetor)
Inlet Line
Kohler Engine Parts Call K&T 606-678-9623 or 606-561-4983
www.mymowerparts.com
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