06/01/2026
π¨ What happens when equipment sits with old fuel? π¨
Take a look at this carburetor before and after cleaning.
The brown, sticky coating you see is called **fuel varnish**. It forms when gasoline sits in a carburetor for months (or years), evaporating and leaving behind deposits that clog fuel passages, stick floats, restrict fuel flow, and prevent engines from running properly.
Common symptoms of carburetor varnish include:
β
Hard starting
β
No start conditions
β
Surging or hunting RPMs
β
Poor performance under load
β
Excessive fuel consumption
This carburetor came in heavily varnished from old fuel and neglect. After a complete teardown and cleaning, all passages were cleared and the carburetor is ready to go back into service.
The best way to prevent this?
β Use fresh fuel
β Add fuel stabilizer when storing equipment
β Run equipment regularly
β Drain fuel systems before long-term storage
If your mower, generator, w**d trimmer, chainsaw, or other small engine equipment has been sitting and won't run, JBS Engine Repair LLC can help get it back in service.
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π§ Small Engine Repair & Maintenance
π Serving the local community