Costco is tightening enforcement at its fuel stations to stop non-members from borrowing a friend's membership card to fill up at the warehouse club's famously low gas prices. The retailer is updating attendant protocols, rolling out digital tracking of card usage, and flagging accounts that show signs of sharing, with membership revocation on the table for violators.
The crackdown targets a well-known workaround: a Costco member swipes a card at one pump, then hands it off to a non-member at the next. It costs the company paying customers and undermines the membership model that keeps Costco's fuel prices well below the competition.
Costco is actively instructing fuel station attendants to watch for card sharing on the pump islands, The U.S. Sun reported. Attendants at certain warehouses may now visually verify that the name on the membership card matches the person pumping gas, a step that turns a casual swipe into something closer to an ID check.
Behind the scenes, the retailer has integrated digital tracking into its fuel transactions. The system monitors whether a single membership card is scanned across multiple pumps or used in rapid succession, patterns consistent with one card serving two or more vehicles. Cards that trigger those flags can be sent up for an account review.
The consequences are real. Costco reserves the right to revoke a membership outright if card sharing is confirmed, whether caught by an attendant on the ground or picked up through surveillance and transaction data.
For years, the gas pump loophole was one of the worst-kept secrets in big-box retail. Costco's fuel centers sit outside the warehouse itself, and the membership verification at the pump relied largely on a card swipe, no photo check, no attendant scrutiny. A member could authorize a pump, pass the card to a companion, and let them fill a second vehicle on the same account. Some did it routinely.
The trick exploited a gap between Costco's in-store checkout, where cashiers scan membership cards and can ask for ID, and the comparatively hands-off fuel island. The new measures close that gap.
For non-members who want Costco gas legitimately, the retailer points to one official workaround: the Costco Shop Card. A member can purchase a Shop Card and give it to a friend or family member, who can then use it at the pump without a membership. The Shop Card bypasses the membership verification screen, making it the only sanctioned path for non-members to access Costco fuel.
Costco's entire business model rests on paid membership. The annual fee, the specific cost is not stated in the available reporting, is the price of admission for access to the company's warehouses, online store, and fuel centers. Every non-member who games the system at the pump is, in effect, getting the benefit without paying the toll.
Fuel is a major traffic driver for Costco. Members regularly cite cheap gas as a top reason they renew. If the perception spreads that anyone can fill up for free by borrowing a card, the incentive to pay for a membership weakens. Costco's enforcement push is a defense of the membership's value proposition, and of the members who actually pay for it.
That distinction matters. The people hurt by card sharing aren't Costco executives. They're the tens of millions of dues-paying members whose fees subsidize the low prices everyone enjoys. When freeloaders cut in line, the paying customer foots the bill.
The reporting leaves several details unresolved. No specific date has been given for when Costco began rolling out these enforcement changes. No individual warehouses or regions have been named as early adopters of the stricter visual-verification protocol. And no Costco spokesperson or executive is quoted on the record confirming or explaining the new measures.
It is also unclear what thresholds Costco's digital tracking system uses to flag a card. How many pumps in how short a window triggers a review? What happens during that review, does the member get a warning first, or can a membership be pulled without notice? None of that is spelled out.
Those gaps matter, because enforcement without transparency can breed frustration among honest members. A family with two cars filling up back-to-back at the same station could, in theory, trip the same digital flags as a card-sharing scheme. Costco will need clear, published standards if it wants to avoid penalizing the very customers it is trying to protect.
Costco is not the only membership-based retailer tightening the screws. The broader trend across warehouse clubs and subscription services has been toward stricter identity verification, a response to years of casual sharing that companies tolerated when growth was the priority. Now, with margins under pressure and membership saturation in key markets, enforcing the rules is no longer optional.
The move also reflects a simple principle that conservative consumers understand instinctively: rules exist for a reason, and people who follow them shouldn't be undercut by people who don't. Costco's gas pumps are not a public utility. They are a private benefit, funded by members who pay for access. Enforcing that boundary is not harsh. It is fair.
If you want the discount, pay the dues. That's how membership works, at Costco and everywhere else.
