Why did the CPSC just decide fuel additives aren't fuel?

The rule in one sentence

Containers built solely for those additives no longer need flame mitigation devices. The change takes effect the same day it appears in the Federal Register.

What the statute actually says

The PFCSA defines a portable fuel container as any vessel intended for flammable liquid fuels with a flash point below 140 degrees Fahrenheit. The list includes gasoline, kerosene, diesel, ethanol, methanol, denatured alcohol, or biofuels. The law never mentions additives that have a low flash point but serve only to improve engine performance, clean engine components, extend engine life, stabilize fuel, or prevent weather effects from fuel.

Why the interpretation flipped

In January 2023 CPSC staff wrote that any liquid with a flash point under 140 degrees Fahrenheit intended to support combustion counted as fuel. That view relied on Chevron deference, which required courts to accept an agency's reasonable reading of an ambiguous statute. The Supreme Court overturned Chevron in Loper Bright Enterprises v. Raimondo, 603 U.S. 369 (2024). Courts now exercise independent judgment on statutory meaning.

A district court in Minnesota had already applied that independent judgment. Auto-Mark, Inc. d/b/a Sea Foam Sales Company sued in December 2024 arguing its additives were not fuel. In September 2025 the court cited dictionary definitions of fuel as material used to produce heat or power by burning. It concluded Sea Foam's products did not meet those definitions. The Commission now aligns its interpretation with that ruling.

The regulatory text added

A new paragraph (b) in 16 CFR 1461.2 states the Commission does not interpret the phrase flammable liquid fuels to include fuel additives intended to be added to flammable liquid fuels for the sole purpose of improving engine performance, cleaning engine components, extending engine life, stabilizing fuel, preventing weather effects from fuel, or another purpose unrelated to creating heat or power. The Commission voted 3-0 to publish the notification.

What changes for manufacturers

Portable containers intended solely for such additives fall outside the flame mitigation device requirements in 16 CFR part 1461. Staff estimates the clarification avoids approximately $545.7 million in annual compliance costs. Discounted over 10- and 30-year periods using OMB-recommended discount rates of 3 and 7 percent, the present value of avoided costs ranges from approximately $3.8 billion to $10.7 billion. The rule is labeled a deregulatory action under Executive Order 14192.

What the document does not address

The notice does not say how many additive containers are currently on the market. It does not list specific brands beyond Sea Foam. It does not explain whether a container marketed for both gasoline and additive would still need a flame mitigation device. The classification of any particular container remains case-specific.