Kohler Command CV730 User Manual download pdf (Page 85)

5B.18

Section 5B

EFI Fuel System

Spark Plugs

EFI engines are equipped with Champion

RC12YC

(Kohler Part No. 12 132 02-S) resistor spark plugs.

Equivalent alternate brand plugs can also be used, but

must be resistor plugs or permanent damage to the

ECU will occur, in addition to affecting operation.

Proper spark plug gap is 0.76 mm (0.030 in.).

Wiring Harness

The wiring harness used in the EFI system connects

the electrical components, providing current and

ground paths for the system to operate. All input and

output signaling occurs through a special all weather

connector that attaches and locks to the ECU (see

Figures 5B-21 and 5B-22).

The condition of the wiring, connectors, and terminal

connections is essential to system function and

performance. Corrosion, moisture, and poor

connections are more likely the cause of operating

problems and system errors than an actual

component. Refer to the ‘‘Troubleshooting –

Electrical’’ section for additional information.

Battery Charging System

EFI engines are equipped with either a 15 or 25 amp

charging system to accommodate the combined

electrical demands of the ignition system and the

specific application. Charging system troubleshooting

information is provided in Section 8.

Fuel Components

Fuel Pump

Internal

External

Figure 5B-21. “24 Pin” (MSE 1.0) Plastic-Cased

ECU Connector.

Figure 5B-22. “32 Pin” (MSE 1.1) Plastic-Cased

ECU Connector.

Figure 5B-23. Fuel Pump Styles.

General

An electric fuel pump is used to transfer fuel in the

EFI system. Depending on the application, the pump

may be inside the fuel tank, or in the fuel line near the

tank. The pumps are rated for a minimum output of

25 liters per hour at 39 psi. The pumps have an

internal 60-micron filter. In addition, the in-tank style

pumps will have a pre-filter attached to the inlet. In-

line pump systems may also have a filter between the

tank and the pump on the pickup/low pressure side.

The final fuel filter is covered separately on page

5B-21.

When the key switch is turned “on” and all safety

switch requirements are met, the ECU, through the

relay activates the fuel pump, which pressurizes the

system for start-up. If the key switch is not promptly

turned to the “start” position, the engine fails to start,

or the engine is stopped with the key switch “on” (as

in the case of an accident), the ECU switches off the

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Kohler Command CV730 User Manual Page 85

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