To stop petrol from going off, the key is proper storage and mindful purchasing to ensure you use fresh fuel. Keep your fuel fresh and store it in sealed containers in a cool dark and dry place, and only purchase enough fuel for about 30 days' use, never using fuel purchased over 60 days ago.
Understanding Why Petrol Degrades
Petrol doesn't last forever. Over time, it can degrade through several processes:
- Oxidation: Components in the fuel react with oxygen, forming gums and varnish deposits that can clog fuel systems.
- Evaporation: Lighter, more volatile compounds in the fuel evaporate, changing the fuel's composition and octane level.
- Water Absorption: Ethanol-blended petrol (commonly E10) can absorb water from the air, which can lead to phase separation (water and ethanol separating from the petrol) and corrosion.
These processes can make the fuel less efficient, harder to ignite, and potentially harmful to engines and fuel system components.
Effective Strategies to Keep Petrol Fresh
Based on best practices, including the recommendation to Keep your fuel fresh and store it in sealed containers in a cool dark and dry place, follow these steps:
1. Proper Storage
- Use Sealed Containers: Always store petrol in approved, airtight containers. This prevents oxygen from reaching the fuel (reducing oxidation) and stops volatile compounds from evaporating.
- Choose the Right Location: Store containers in a cool, dark, and dry place. Avoid direct sunlight, heat sources, and areas with fluctuating temperatures. The reference specifically advises storing fuel (and machines) "under the bench on a stone floor, rather than on the bench in front of the shed window", highlighting the importance of keeping it cool and out of light.
- Avoid Moisture: Ensure the storage area is dry to minimize the risk of water contamination or absorption, especially with ethanol blends.
2. Manage Your Fuel Supply
- Buy Only What You Need: The reference recommends Purchase only enough fuel for 30 days use. This ensures you are constantly using relatively fresh fuel.
- Rotate Stock: If you have multiple containers, use the oldest fuel first (following safety guidelines).
- Know When to Discard: The reference strongly advises never, ever use fuel purchased over 60 days ago. This is a crucial guideline to avoid engine problems caused by degraded fuel.
3. Consider Fuel Stabilizers (Optional)
While the reference doesn't mention them, fuel stabilizers can be added to petrol, especially if you anticipate storing it for longer periods than recommended (though adhering to the 60-day rule is safest). Stabilizers help to slow down the oxidation process and prevent deposits from forming.
By following these simple storage and purchasing guidelines, you can significantly extend the usable life of your petrol and protect your engines.
