Kohler Ford LSG-423 — Fuel Pump Pressure Test
Testing & diagnosis · Fuel System
For the Kohler Ford LSG-423, from the Kohler service manual.
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Before you start
- Use care to prevent combustion due to fuel spillage
Procedure
- Remove the air cleaner assembly; disconnect the fuel inlet line or the fuel filter at the carburetor
- Connect a pressure gauge, a restrictor and a flexible hose between the fuel filter and the carburetor
- Position the flexible fuel outlet hose and restrictor so fuel discharges into a graduated container
- Operate the engine at the specified idle rpm and vent the system into the container by opening the hose restrictor momentarily
- Close the hose restrictor and the pump-to-tank return line, allow the pressure to stabilize, and note the reading
- If pump pressure is not within specifications and the fuel lines and filter are satisfactory, the pump is defective and should be replaced
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Fuel pump static pressure 5.0-7.0 PSI
- Inside diameter of smallest passage in test flow circuit must not be smaller than .220
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.