How to Replace FPM for Kohler Engine EFI System

Here is the instruction show you guide on how to replace fuel pump module (FPM) for Kohler engine EFI system.

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FPM is not serviceable and must be replaced if determined to be faulty. If a FPM problem is suspected,make certain pump is being activated, all electrical connections are properly secured and fuses are good. If required, testing of FPM may be conducted.

NOTE: FPM pins are coated with a thin layer of electrical grease to prevent fretting and corrosion. Do not attempt to remove electrical grease from fuel pump module pins.

1 Relieve fuel pressure at FPM. Press release button(s) and slowly pull connector away from FPM allowing shop towel to absorb any residual fuel in high pressure fuel line. Insert pressure test jumper (from Kohler EFI Service Kit) between high pressure fuel line and FPM.

2 Connect black hose of Pressure Tester. Route clear hose into a portable gasoline container or equipment fuel tank.

3 Turn on key switch to activate pump and check system pressure on gauge. It may take several key cycles to compress air introduced into system and reach regulated pressure. Turn key OFF for at least

10 seconds between tests to allow ECU to go to sleep and reawake. System pressure of 39 psi ± 3 should be present. Turn key switch OFF and depress valve button on tester to relieve system pressure.
a If pressure is too high or too low, proceed to troubleshooting.

4 If pump did not activate (step 3), confi rm that safety system on equipment is not active. One potential cause of unnecessary FPM replacement may involve measuring voltage at FPM electrical connector. Using a Digital Volt Ohm Meter (DVOM) will provide a reading near battery voltage, even when ECU is not grounding FPM circuit.

a Connect a DVOM across terminals in plug, turn on key switch and confi rm battery voltage is present during six second prime process.
b Test light confi rmation: Turn key off. Disconnect DVOM. Connect 12 volt test light across terminals in plug. Key needs to remain off for a minimum of 30 seconds before proceeding. Turn key on. Confi rm test light illuminates for approximately 6 seconds. After approximately 6 seconds, test light will remain off unless another prime cycle is initiated.

5 If battery voltage is not present and/or test light does not illuminate, connect red lead of DVOM to red wire of plug and black lead to a battery ground while key is still ON.

6 If battery voltage is present, turn key switch OFF and connect an ohmmeter between terminals on FPM to check for continuity. If battery voltage at plug was confi rmed, and there was continuity across FPM terminals, reconnect plug to FPM, making sure you have a good connection. Turn on key switch and listen for FPM to activate.
a If FPM starts, repeat steps 2 and 3 to verify correct pressure.

b If FPM still does not operate, replace it.
7 If battery voltage was not present at connector inspect fuse and wiring harness.