DuroMax
Rich Fuel Mixture
Black smoke from exhaust and strong fuel smell, engine lacks power
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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
Stuck closed choke, Dirty air filter, Incorrect carburetor jetting, Faulty MAP/oxygen sensor (EFI models)
How to Fix / Troubleshooting
Safety first: Run the generator outdoors only. Shut down and disconnect battery negative before inspecting intake components.
- Check choke: Ensure the choke plate opens fully after warm‑up. Repair or replace a stuck choke linkage or solenoid.
- Replace air filter: Install a new DuroMax air filter if the old one is dirty or oil‑soaked.
- Carburetor inspection: Verify that the correct main jet is installed and that the float level is set per the manual.
- EFI sensors: On EFI units, a failed MAP or O2 sensor can cause rich running. This requires diagnostic tools and sensor replacement by a technician.
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Repair Difficulty
Medium
3/5
Required Part
Choke Solenoid
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