How should I store fuel for a backup generator?

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Fuel Container Selection and Placement Metal and plastic containers designed for fuel storage work well. Avoid repurposed containers with previous contents that might contaminate fuel. Place containers outside, away from dwellings and ignition sources. Proper ventilation prevents vapor accumulation. Cover containers protecting from rain and sunlight which accelerate fuel degradation.
Gasoline Storage Limitations Gasoline degrades within 3-6 months even with treatment. Varnish and gum develop as fuel oxidizes, clogging carburetors and injectors. Ethanol-blended gasoline common in most regions degrades faster than pure gasoline. For backup systems, expect generator maintenance if using gasoline stored more than 3 months.
Diesel Advantages for Long-Term Storage Diesel fuel stores 6-12 months with proper treatment. Cooler temperature preference aids longevity. Diesel engines run on degraded fuel that gasoline engines reject. For off-grid systems relying on occasional backup, diesel proves superior to gasoline.
Fuel Stabilizer Use Fuel stabilizer products slow oxidation extending viability. Gasoline with stabilizer extends storage to 12 months. Diesel benefits similarly from treatment. Use stabilizer at recommended rates—excess application creates problems.
Rotation Schedule Establish quarterly or semi-annual fuel rotation. Use oldest stock first, replacing with fresh fuel. Rotation prevents accumulation of degraded fuel. Emergency generators function reliably with regular rotation, while untreated stored fuel causes starting problems exactly when needed.
Safety Protocols Store fuel away from electrical systems and ignition sources. Never store fuel indoors despite convenient access claims. Follow local fire codes strictly—violations create insurance and liability issues. Regular inspections identify leaks before problems develop.