Quick Answer
Risks of using expired fuel in an emergency include engine failure, clogged fuel lines, and potentially catastrophic engine damage, all of which can leave you stranded far from home.
Fuel Degradation and Engine Damage
Using expired fuel can cause significant damage to your engine. Fuel that has been stored for too long can break down into varnish-like substances that clog fuel lines and fuel injectors. This can prevent your engine from getting the fuel it needs to run, leading to stalling, hesitation, and ultimately, engine failure. Most fuel manufacturers recommend replacing fuel that has been stored for more than 30 days. If you are unsure whether your fuel is still good, it’s best to err on the side of caution and replace it.
Clogged Fuel Lines and Filters
Expired fuel can also cause your fuel lines and filters to become clogged. This is because the breakdown products of fuel can solidify and become sticky, adhering to the walls of your fuel lines and filters. This can restrict fuel flow, leading to decreased engine performance and potentially causing your engine to stall or fail. To prevent this, make sure to replace your fuel filters every 12 months or 12,000 miles, whichever comes first.
Prevention and Preparation
To avoid the risks of using expired fuel, make sure to store your fuel in a clean, dry container and replace it regularly. It’s also a good idea to keep track of the date you purchased your fuel and check it periodically to ensure it’s still good. Additionally, consider investing in a fuel stabilizer, which can help to prevent fuel degradation and keep your fuel fresh for longer.
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