You Have a Jerry Can, Now What?
You just bought a sturdy, red plastic container with a spout. It’s a jerry can, a simple tool with one critical job: moving fuel from point A to point B. Maybe you need it for your lawnmower, a generator during a storm, or a long off-road trip where gas stations are scarce.
But if you’ve never used one before, that simple task can feel daunting. The smell of gasoline is strong, the warnings are serious, and the last thing you want is a spill, a fire, or ruined equipment. Using a jerry can incorrectly isn’t just messy; it’s dangerous.
This guide cuts through the uncertainty. We’ll walk through the entire process, from choosing the right can to pouring the last drop safely. You’ll learn not just the steps, but the reasons behind them, turning a potentially hazardous chore into a routine, confident task.
Understanding Your Jerry Can
Before you pour a single ounce of fuel, take a moment to understand the tool in your hands. Not all jerry cans are created equal, and using the wrong one is your first mistake.
Material Matters: Plastic vs. Metal
Modern jerry cans are typically made from high-density polyethylene (HDPE) plastic. They’re lightweight, won’t rust, and are often translucent so you can see the fuel level. They must be marked with the type of fuel they’re designed for (e.g., “GASOLINE” or “DIESEL”). Never use a plastic can not certified for fuel.
Metal cans, usually steel, are less common for consumer use today. They are extremely durable but can rust internally if not kept perfectly dry, contaminating your fuel. They also conduct static electricity, which requires special grounding precautions during filling.
The Anatomy of a Safe Pour
A proper jerry can has several key features. The main cap should seal with an airtight gasket. There will be a smaller vent cap, often on the opposite side or top. This is crucial for allowing air in as fuel pours out, preventing a glugging, sputtering mess.
Finally, there’s the pour spout. Modern safety cans have a long, flexible spout that often includes a trigger mechanism to open the flow. Some have an attached funnel. Older or basic cans may have a separate spout you must screw on.
Preparing to Fill Your Can
Safety starts at the gas station. This is where most risks are highest due to vapors, static electricity, and other vehicles.
Ground Yourself First
Static discharge is a real ignition risk. Before you touch the pump or your can, discharge any static by touching a metal part of your car door or the pump housing with your bare hand. Do this again after sliding into your car seat if you return to move the car.
Always place the can on the ground before filling. Never leave it in your truck bed, on a plastic liner, or in your car. Placing it on the ground allows it to be grounded, dissipating static charge.
Choosing the Right Fuel and Avoiding Overfilling
Ensure you’re at the correct pump for your needs. Most small engines and older cars use regular unleaded gasoline. Check your equipment manual. Diesel cans and gasoline cans are different and should not be interchanged.
Do not fill the can to the very brim. Fuel expands as it warms up. If you fill it completely on a cool morning, it could expand and leak or even rupture the can in a hot car. Leave at least one inch of space, or about 5% of the can’s volume, for expansion.
The Step-by-Step Pouring Process
Now you’re home, with a full can on a stable surface. Here’s how to transfer the fuel without spills or strain.
Setting Up for a Clean Transfer
Move to a well-ventilated area, outdoors is best. Have a rag or paper towels handy for minor drips. Ensure the engine or device you’re filling is cool. Never add fuel to a hot engine or a generator that was just running.
If your can has a separate spout, screw it on tightly now. Open the vent cap. This is the step most people forget, leading to frustrating glugs and spills. The vent allows air to enter the can, replacing the volume of the leaving fuel, for a smooth, steady stream.
The Actual Pour
Insert the spout fully into the equipment’s fill neck. Tilt the can slowly and steadily. For heavier cans, use both hands, one on the handle and one supporting the bottom. Use the spout’s trigger mechanism if it has one to start and stop the flow.
Pour slowly to avoid splashing and to allow air in the tank to escape. Watch the fuel level in the equipment’s tank or your can to know when to stop. Do not use funnels with fine mesh screens meant for oil; they can create static.
Securing and Storing Leftover Fuel
You’ve filled your lawnmower, but you have half a can left. What now? Proper storage is critical for safety and fuel quality.
Sealing and Cleaning
First, close the vent cap tightly. Then, seal the main pour spout or cap. Wipe down the entire exterior of the can with a dry rag to remove any fuel residue. This prevents oily smells in your storage area and reduces fire risk.
Finding the Right Storage Spot
Store the can in a cool, dry, well-ventilated place away from direct sunlight, living areas, and any source of heat or ignition (water heaters, furnaces, power tools). A detached, ventilated shed or garage is ideal. Never store it in a basement or a living space due to fume accumulation.
Keep it out of reach of children and pets, and never store it near open flames, sparks, or pilot lights. For longer-term storage (over a month), consider adding a fuel stabilizer to prevent the gasoline from degrading and forming gums that can clog small engines.
Troubleshooting Common Problems
Even with care, things can go wrong. Here’s how to handle common jerry can issues.
The Dreaded Glug and Spill
If the fuel pours in sudden, messy glugs, you almost certainly forgot to open the vent cap. Stop pouring immediately, set the can upright, open the vent cap, and try again. The flow should now be smooth.
If you spill fuel, do not start an engine or create a spark nearby. Absorb small spills with cat litter or a commercial absorbent. For larger spills, you may need to contact local hazardous waste disposal.
Stuck Caps and Leaky Seals
Caps can become very tight. Use a strap wrench or a piece of rubber for grip. Never use pliers directly on plastic caps, as they can crack. If a cap’s gasket is cracked or missing, replace it immediately. A leaking seal allows dangerous vapors to escape and degrades the fuel.
If the can itself is cracked or damaged, especially near the seams, do not use it. Dispose of it properly at a hazardous waste facility and replace it. The cost of a new can is far less than the risk of a failure.
Beyond Gasoline: Diesel and Other Fuels
The principles are similar, but critical differences exist. Diesel cans are usually yellow, while gasoline cans are red. This color code is a vital safety standard. Never put gasoline in a diesel-labeled can or vice-versa. Even small amounts of the wrong fuel can cause catastrophic engine damage.
Diesel is less volatile than gasoline, so vapor ignition is a lower risk, but it is still flammable. The same grounding and no-smoking rules apply. Diesel can also grow algae or microbes in storage; biocides are available for long-term diesel storage.
For kerosene or other specialty fuels, always use a can clearly labeled for that purpose. Cross-contamination can ruin fuel and equipment.
Making Fuel Management a Safe Habit
Using a jerry can safely isn’t a one-time lesson; it’s a set of habits. Always double-check the fuel type against the can label. Always ground yourself and the can. Always open the vent. Always store it properly.
Invest in quality cans from reputable brands. They have better seals, clearer markings, and more user-friendly spouts. Teach everyone in your household who might use them the same safety rules.
With this knowledge, that simple red container becomes a reliable tool, not a source of anxiety. You can prepare for a power outage, maintain your property, or embark on an adventure, knowing you can handle your fuel safely and efficiently from the pump to the tank.
