Why does my garage smell like gas even with the cans closed?

This is due to 'permeation.' Plastic (HDPE) is porous at a microscopic level. Hydrocarbons in the fuel literally migrate through the plastic walls and evaporate into the air, creating a smell even if the seal is perfect.

Are metal gas cans safer than plastic?

Generally, yes. Metal cans (like NATO Wavian cans) are grounded (preventing static buildup), seal 100% airtight to prevent vapor escape, and are more resistant to swelling in heat.

How to Store Race Gas: Plastic vs. Metal Containers (2026 Guide)

The Short Answer: For transporting fuel to the track, use Plastic (HDPE) because it is light. For storing fuel at home for months, use Metal (NATO) because it blocks vapors and smells.

The "Smell Test": Understanding Permeation

Have you ever walked into your garage and smelled gas, even though your plastic jerry cans were screwed tight? That is called Permeation.

Plastic utility jugs are made of HDPE (High-Density Polyethylene). While durable, HDPE is microscopicly porous to hydrocarbons. The fuel vapors literally migrate through the walls of the plastic and evaporate into the air. This not only stinks—it means your expensive race gas is slowly losing its "light ends" (the most combustible components).

Comparison: Plastic vs. Metal

Factor	Plastic (Utility Jugs)	Metal (NATO/Wavian)
Permeation (Smell)	High (Vapors escape)	Zero (Airtight)
Weight (Empty)	~3 lbs	~10 lbs
Durability	Can swell/warp in sun	Bombproof
Cost	$30 - $50	$80 - $120

1. Plastic Utility Jugs (The Track Standard)

If you go to any track day, you will see rows of square "VP Racing" style jugs. They are iconic for a reason: the ergonomics are perfect for rapid refueling.

Pros

Lightweight and easy to lift.
Translucent (you can see fuel level).
Large handles make pouring fast.

Cons

Static Hazard: Plastic insulates charge.
Will make enclosed trailers smell.
UV light degrades the plastic over time.

Check Price on VP Racing Cans

2. Metal NATO Cans (The Storage King)

Based on the original WWII German design (Jerry Can), the "Wavian" style metal can is the gold standard for long-term storage.

Pros

100% Vapor seal (No smell).
Grounded material (Safer for static).
Square shape stacks perfectly.

Cons

Expensive ($80+ per can).
Heavy to lift when full.
Opaque (can't see fuel level).

Check Price on Wavian Cans

Critical Safety: Static Electricity

When fuel flows, it creates static friction.

Plastic Cans: Since plastic is an insulator, the static charge sits on the surface waiting to arc. If you touch the nozzle to the metal car chassis, *snap*—you have a spark. Always place plastic cans on the ground before filling. Never fill them in a truck bed (bedliners insulate them).
Metal Cans: Metal conducts electricity. If the can touches the car or the ground, the charge dissipates harmlessly. This is why aviation and military specs strictly require metal containers.