Gasoline does not last forever. After a few months it begins to degrade, losing volatility and forming varnish like deposits that can clog fuel systems. Old gas left sitting in a lawnmower, motorcycle, or classic car tank can smell sour, turn darker in color, and cause engine trouble. If you have a container of stale fuel or a tank full of the stuff, it is important to dispose of it properly. Pouring it down a drain or onto the ground is not only dangerous but also illegal. Here is how to get rid of old gasoline safely.
Recognize When Gas Has Gone Bad
Fresh gasoline is usually clear or pale in color with a clean smell. Old gasoline often looks darker, has a sticky texture, and gives off a strong sour or varnish like odor. If you suspect fuel has been sitting longer than six months, assume it has gone bad. Trying to run an engine on it can lead to hard starting, knocking, or permanent damage.
Transfer It to a Safe Container
Before disposing of old gas, move it into a proper gasoline approved container. Use a siphon pump rather than trying to pour directly, which risks spilling. Always handle fuel outdoors or in a very well ventilated area away from open flames, sparks, or cigarettes. Approved red plastic gas cans with tight sealing caps are the safest choice.
Contact Local Disposal Services
Most communities have hazardous waste collection centers or designated drop off points that accept old gasoline. Many recycling centers or fire departments can direct you to the right facility. Call ahead to confirm, since some locations only take fuel on certain days. Never leave old gasoline at the curb or in the regular trash.
Use Household Hazardous Waste Events
Many towns and cities hold special events for collecting household hazardous waste, which often includes gasoline, solvents, and motor oil. These are convenient ways to safely hand off fuel in small quantities. Check your city or county website for schedules.
Small Amounts Can Sometimes Be Reused
If the gas is only slightly degraded, you can dilute it with fresh gasoline and safely burn it in less sensitive engines like lawnmowers or yard equipment. A ratio of one part old gas to four or five parts new fuel usually prevents problems. Never use old gasoline in modern fuel injected cars or motorcycles where precision fuel systems can be damaged.
Never Dump Gasoline Outdoors
Dumping gasoline into the soil, a drain, or sewer is extremely harmful to the environment and can contaminate water supplies. It also creates a major fire hazard. Aside from the risk, it is illegal in most places and carries heavy penalties. Responsible disposal protects both the environment and your safety.
Store Gasoline the Right Way Next Time
The best way to avoid dealing with old gasoline is to store it properly in the first place. Keep it in sealed, approved containers stored in a cool dry place away from sunlight. Adding a fuel stabilizer extends the shelf life up to a year. For cars or motorcycles that sit for long periods, filling the tank completely and using a stabilizer prevents moisture and keeps the fuel fresh longer.
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