Low Fuel Pressure
Kohler
Gaseous Fuel Supply Pressure Fault
Controller displays “Low Fuel Pressure” or “Fuel Pressure” alarm; engine may stall or fail to start.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Insufficient natural gas or LP inlet pressure, Blocked or undersized gas piping, Faulty gas regulator, Clogged fuel filter or demand regulator
How to Fix / Troubleshooting
Safety first: Turn generator OFF, open main breaker, and close the manual gas shutoff valve. Work in a well-ventilated area and avoid open flames.
- Check gas supply: For LP, verify tank level and that the main tank valve is open. For NG, confirm service with the gas utility and that upstream valves are open.
- Inspect piping: Ensure gas line size meets Kohler installation requirements for the generator’s BTU demand and run length. Undersized piping can cause pressure drop.
- Regulator inspection: Examine the external gas regulator and the engine-mounted demand regulator for icing, contamination, or damage. Replace if leaking or malfunctioning.
- Fuel filter: If equipped, replace the inline fuel filter per Kohler maintenance schedule.
- Pressure test (pro): Have a licensed gas technician measure inlet pressure at the generator while running. Compare to Kohler’s specified range. Adjust or replace regulators as needed.
Do not attempt to adjust gas regulators without proper training and instruments. Gas leaks and improper pressure can be hazardous.
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Repair Difficulty
Professional Required
5/5
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