My Champion generator won't start after sitting for a while. What could be causing this?

When a Champion portable generator fails to start after sitting dormant and unused for several weeks or months, the root cause is almost always fuel system degradation. Unmanaged gasoline left sitting inside the carburetor bowl evaporates over time, leaving behind a thick, sticky varnish that clogs microscopic brass jets and blocks fuel flow into the combustion chamber. Additional contributing factors include a dead starter battery on electric-start models, a tripped low-oil sensor disabling ignition, or a carbon-fouled spark plug. You can troubleshoot engine start failures safely by checking fuel freshness and oil levels first. You can verify that your corrective action is successful when draining old rancid gasoline, cleaning the carburetor main jet with aerosol cleaner, topping off oil, and pulling the recoil cord allows the engine to catch and run smoothly.