Unfortunately, gasoline has a finite shelf life, becoming "old," within a matter of only a month in some cases. If the gas in your mower is stale, the machine will be difficult to start, won't run ...

Dispose of old gas properly and promptly to avoid problems. It is a bad idea to leave gas in a lawn mower over winter due to the internal problems it can cause. Do not mix old, stale gasoline from ...

It is a bad idea to leave gas in a lawn mower over winter due to the internal problems it can cause. Do not mix old, stale gasoline from winter with new gas in spring. Dispose of the old gas first.