Safe Fuel Storage in Jerry Cans

Emergency fuel storage allows you to keep vehicles running and generators operational when retail fuel becomes unavailable. But petrol (gasoline) in particular is extremely hazardous — it has a very low flashpoint, produces vapour at room temperature, and is a leading cause of residential fires and explosions when stored improperly. This guide covers how to store fuel safely and legally.

Legal Limits on Home Fuel Storage

Most jurisdictions have legal limits on home fuel storage:

Region	Typical Limit	Notes
United Kingdom	30 litres petrol at home; 10 litres in a vehicle	Metal containers: 20L; plastic: 10L per HSE guidance
European Union	Varies by country; typically 20–60 litres	Check national regulations
United States	NFPA recommends max 25 gallons (95 litres) at home	Local fire codes may differ
Australia	Up to 250 litres with permit; typically 100 litres permitted in residential	State-specific regulations apply

Check your local authority's regulations. Exceeding limits may void home insurance and creates legal liability.

Choosing the Right Container

Approved Containers Only

Only store fuel in containers specifically designed and approved for flammable liquid storage:

• Look for UN-approved containers or equivalents (FM/UL listed in the US)
• The container must have a self-closing cap and ideally a flame arrestor in the nozzle
• Containers must be specifically rated for the fuel type you are storing

Container Type	For Petrol/Gasoline	For Diesel
Red container	Standard colour for petrol	Not recommended
Yellow container	Not recommended	Standard colour for diesel
Green container	Standard for petrol in some regions
Blue container	Standard for kerosene

The colour coding matters for preventing contamination — petrol in a diesel engine or vice versa causes serious damage.

Container Sizes

• 5-litre containers — easiest to handle; low storage per unit
• 10-litre containers — practical compromise
• 20-litre containers — most efficient per storage space; heavy when full (~15 kg for petrol)

Do not use containers larger than 25 litres for regular handling — the weight makes safe pouring very difficult.

Proper Storage Conditions

1. Outdoors or in a detached outbuilding — ideally in a purpose-built shed or garage away from the main house
2. Never inside the home or basement — petrol vapour is heavier than air and accumulates; ignition can be catastrophic
3. Away from ignition sources — no boilers, water heaters, electrical panels, or open flames within the storage area
4. Ventilated space — even sealed containers produce slight vapour; ventilation prevents accumulation
5. Cool and shaded — heat increases vapour pressure and evaporation
6. Off the floor if possible — raised storage reduces flood risk and prevents contact with moisture
7. Out of reach of children — locked storage if children have access to the area

Fuel Shelf Life and Stabilisers

Fuel degrades over time:

• Petrol (gasoline): Begins degrading in 30–60 days without stabiliser; can cause carburettor gumming and starting problems
• Diesel: More stable; typically 6–12 months before significant degradation
• Treated fuel with stabiliser: 1–2+ years for petrol; longer for diesel

Fuel stabiliser (e.g., Sta-Bil, PRI-G) significantly extends shelf life:

• Add at the recommended ratio when filling the container
• Mix by sloshing gently
• Label the container with the fill date and stabiliser application

Rotation and Usage

A stock that is never used becomes degraded fuel that damages engines:

1. Rotate your stock — use stored fuel in your vehicle or generator every 6–12 months and replace with fresh fuel.
2. First in, first out — use the oldest container first.
3. Label each container with fill date and fuel type.

Emergency Pouring and Transfer

When transferring fuel:

1. Use a proper spout or approved transfer pump — improvisations cause spills.
2. Do not siphon fuel with your mouth — ingestion is toxic; use a hand pump siphon.
3. Transfer away from ignition sources — static electricity can ignite petrol vapour.
4. Discharge static by touching a metal part of the vehicle before and during transfer.
5. Do not transfer fuel inside a vehicle in motion or from a hot engine.

---

Quick Reference

Issue	Action
Container type	UN-approved; correct colour for fuel type
Storage location	Detached outbuilding; outdoors; ventilated; away from ignition
Never store	Inside house, basement, or attached garage near heat
Shelf life	Petrol: 30 days untreated; 1–2 years with stabiliser
Stabiliser	Add when filling; label with date
Rotation	Use and replace every 6–12 months
Legal limits	Check local regulations — typically 20–100 litres