Kohler COMMAND CH18-745 User Manual download pdf (Page 78)

5B.19

Section 5B

EFI Fuel System

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

ECU Connector.

Fuel Components

Fuel Pump

Figure 5B-25. “32 Pin” (MSE 1.1) Plastic-Cased

ECU Connector.

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.

Figure 5B-26. 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 ahead of the pump on

the pick-up/low pressure side. The final filter is

covered separately on page 5B.22.

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

pump preventing the continued delivery of fuel. In this

situation, the MIL will go on, but it will go back off after

4 cranking revolutions if system function is OK. Once

the engine is running, the fuel pump remains on.

Service

The fuel pumps are non-serviceable and must be

replaced if determined to be faulty. If a fuel delivery

problem is suspected, make certain the pump is being

activated through the relay, all electrical connections

are properly secured, the fuses are good, and a

minimum of 7.0 volts is being supplied. If during

cranking, voltage drops below 7.0 volts, a reduction of

fuel pressure may occur resulting in a lean starting

condition. If required, testing of the fuel pump and

relay may be conducted.

Internal

External

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Kohler COMMAND CH18-745 User Manual Page 78

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