Cummins
External Fuel Leak
Fuel odor around Cummins standby generator enclosure
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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
Loose fuel line fittings, Cracked flexible fuel hose, Leaking fuel filter seal, Faulty fuel tank or day tank fittings
How to Fix / Troubleshooting
Safety first: Immediately disable automatic start and shut off fuel supply at the main valve. Eliminate all ignition sources and ventilate the area.
- Visual inspection: Trace fuel lines from the tank to the engine. Look for wet spots, drips, or stains.
- Fittings and hoses: Tighten loose clamps and fittings. Replace any cracked or swollen flexible hoses with fuel-rated hose of the correct size.
- Fuel filter: Check the Cummins fuel filter for proper installation and gasket seating. Replace the filter and gasket if leaking.
- Tank and connections: Inspect the tank, sending unit, and fittings for leaks. Repair or replace as needed.
- Test: After repairs, pressurize or run the fuel system briefly while checking for new leaks before returning to service.
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Repair Difficulty
Medium
3/5
Required Part
Fuel Hose Assembly
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