Quick Answer
Fuel stabilizers can only prevent fuel degradation, not reverse it, so they won't restore fuel that has already gone bad. If you've stored fuel for more than a year, it's best to dispose of it and start fresh. Stabilizers won't fix the problem, only prevent it from getting worse.
When to Use Fuel Stabilizers
Fuel stabilizers are designed to prevent fuel degradation in storage, not to fix it after the fact. If you’ve stored fuel for more than a year, it’s likely broken down, and the only solution is to dispose of it. To prevent this from happening in the first place, add a fuel stabilizer to your fuel within 30 days of storage, and re-treat it every 6-12 months.
Signs of Bad Fuel
If your fuel is separating into distinct layers, has a strong, pungent smell, or has turned a dark color, it’s likely gone bad. In these cases, it’s best to err on the side of caution and dispose of it. Don’t try to use it, even with a fuel stabilizer, as it may be contaminated with water, sediment, or other impurities.
Safe Fuel Disposal
If you need to dispose of bad fuel, do it safely. Drain the fuel into a leak-proof container and take it to a service station or recycling center that accepts used motor oil. Don’t dispose of it down the drain or in household trash, as it can contaminate soil and waterways. Wear protective gloves and eyewear when handling the fuel to avoid skin and eye irritation.
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