Kohler — Fuel Pump Module (FPM) Pressure Test
Testing & diagnosis
From a Kohler service manual covering: ECV850, ECV860, ECV870, ECV880. Check it applies to your exact model before use.
Browse Kohler generators & specs →
Before you start
- Precision components inside fuel pump module are not serviceable. DO NOT attempt to open fuel pump module.
Procedure
- Relieve fuel pressure at FPM; insert pressure test jumper between high pressure fuel line and FPM.
- Connect black hose of Pressure Tester; route clear hose into a portable gasoline container or equipment fuel tank.
- Turn on key switch to activate pump and check system pressure on gauge.
- Turn key switch OFF and depress valve button on tester to relieve system pressure.
- If pressure is too high or too low, proceed to troubleshooting.
Tools required
- Kohler EFI Service Kit pressure test jumper Amazon
- Pressure Tester Amazon
- DVOM Amazon
- 12 volt test light Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- System pressure of 39 psi ± 3
- Fuel pump module minimum output of 13.5 liters per hour
- ECU activates fuel pump module for about six seconds at key ON
Source: Kohler service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.