How to Safely Store a 5 Gallon Gas Tank | Prevent Fires & Fumes

A 5-gallon gas tank requires an approved container, storage in a cool detached shed or garage at least 50 feet from pilot lights, and a fill level no higher than 95% to leave expansion room.

A five-gallon gas can holds enough fuel for a lawnmower, generator, or weekend project, but gasoline vapors are heavier than air and can travel unseen to a pilot light, water heater, or furnace. One mistake turns a useful container into a hazard. The rules are simple and come from safety agencies that have studied the worst-case scenarios. Whether you store fuel for a chainsaw or a backup generator, these steps protect your home and everyone in it.

Choosing the Right Container for a 5-Gallon Gas Tank

Gasoline belongs only in an approved fuel can or tank designed for it, and safety standards limit those containers to five gallons or less. Look for the label or stamp that says the container meets ASTM, UL, or EPA requirements for gasoline — these are the ones with the flame-resistant mesh, pressure-relief valves, and spill-proof spouts. Never use glass jars, soft-drink bottles, milk jugs, or any improvised container. Gasoline chemically degrades plastics not designed for it, and glass can shatter from a bump or from vapor pressure. If you need a new can, the current lineup of tested options includes reliable models built exactly for this job.

Where to Store Your 5-Gallon Gas Can

The safest location is a detached garage or shed, kept out of direct sunlight and at least 50 feet away from any ignition source — pilot lights on water heaters, furnaces, space heaters, and gas-fired appliances qualify. Gasoline vapors are heavier than air, so they sink and crawl along the floor. A stray vapor cloud can hit a basement furnace pilot and ignite from across the room, which is why gasoline should never be stored inside the house or in a basement. If a detached space isn’t available, a well-ventilated attached garage is the next best option, but keep the can as far from the water heater and furnace as possible.

Filling, Sealing, and Transporting a Gas Tank Safely

Fill the container on the ground, outdoors, to reduce static electricity buildup and prevent vapor accumulation inside a vehicle or enclosed space. Never fill a can while it sits in the bed of a truck or inside a car. Stop at 95 percent full — leave at least five percent of the container empty for gasoline expansion as the temperature changes. After filling, tighten the cap until it clicks or seals completely. When transporting the container, place it in the trunk with the cap facing up, and secure it so it cannot tip over. Check the can regularly for leaks, cracks, or bent spouts, and clean any spilled fuel immediately.

Things That Can Go Wrong (And How to Avoid Them)

The most common mistakes are storing gasoline inside the home or basement, overfilling a can so there is no room for expansion, and placing cans near water heaters, furnaces, or space heaters. Storing fuel in direct sunlight or near a hot surface accelerates vapor release and degrades the container. Leaving a can unsealed or using a damaged can are both fire and breathing hazards. Children and pets must never have access to stored fuel — keep the container in a locked or out-of-reach location. A little caution when you put the can away prevents the kinds of emergencies safety regulators write warnings about.

Before you buy, our tested roundup of the best 5-gallon gas tanks available now shows the current models that meet safety standards and hold up to regular use.

FAQs

Can I store a gas can in my garage attached to the house?

Yes, but place it at least 50 feet from the water heater, furnace, or any appliance with a pilot light. Keep the can on a shelf or floor away from heat sources, out of direct sunlight, and in a well-ventilated area. A detached shed is safer, but an attached garage is acceptable with these precautions.

How long can gasoline stay in a five-gallon can before it goes bad?

Untreated gasoline stored in a sealed, cool container lasts about three to six months before it begins to degrade and form gums that can clog engines. Adding a fuel stabilizer extends that window to roughly 12 months. Always check the fuel’s color and smell before using old gas.

Is it safe to store a gas can in direct sunlight?

No. Direct sunlight heats the container, increases internal vapor pressure, and accelerates fuel degradation. Even approved containers can leak from pressure buildup on very hot days. Always store fuel in a shaded, room-temperature location.