Kohler Command CV730 User Manual download pdf (Page 38)

5.4

Section 5

Fuel System and Governor

3. Remove the pulse line that connects the pump to

the crankcase.

4. Install a new pump using the hex flange screws.

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

CV17-740 engines in this series are equipped with

either a Nikki or Keihin one-barrel, fixed main jet

carburetor. Some applications use a fuel shut-off

solenoid installed in place of the fuel bowl retaining

screw, and also an accelerator pump. All carburetors

feature a self-relieving choke like or similar to the one

shown in the exploded view on page 5.12. These

carburetors include three main circuits, which

function as described following. CV750 engines use a

Keihin BK two-barrel carburetor on a matching intake

manifold. This carburetor with related servicing and

adjustments is covered beginning on page 5.20.

CV17-740 Engines

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 5-2. 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.

Pulse Line

Outlet Line (to

Carburetor)

Inlet Line

Fuel Pump

General

These engines are equipped with a pulse type fuel

pump. The pumping action is created by the

oscillation of positive and negative pressures within

the crankcase. This pressure is transmitted to the pulse

pump through a rubber hose connected between the

pump and crankcase. The pumping action causes the

diaphragm on the inside of the pump to pull fuel in

on its downward stroke and to push it into the

carburetor on its upward stroke. Two check valves

prevent fuel from going backward through the pump.

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Kohler Command CV730 User Manual Page 38

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