Frequently Asked Questions

Costco Gas Stations

Can anyone buy fuel at a Costco Gas station?

The gas station is open to Costco members only, with one exception: Costco Shop Card holders do not need to be members.

Why does the gas station traffic flow only one way?

Costco’s approach to gasoline is the same as inside the warehouse: high volume and low prices. One-way traffic makes it easier to get in and out of our stations quickly. Our extra-long hoses allow fueling from either side of the vehicle, so there is no concern with which lane to choose.

How do I pay for my gasoline?

The gas station is entirely self-serve, with pay-at-the-pump technology. We accept MasterCard, Canadian debit cards and Costco Shop Cards.

Can I pay with cash or a cheque?

Cash and cheques are not accepted for payment. Eliminating the need for a cashier means a shorter wait for our members. Members may use cash to purchase a Costco Shop Card inside the warehouse.

Why doesn’t Costco accept other major credit cards?

Our exclusive agreement with MasterCard helps to ensure the lowest transaction fees available, which in turn helps Costco keep prices low.

How does the pump know the customer is a member?

When a customer inserts a membership card or a co-branded MasterCard the system reads the membership number on the card and confirms the membership is active. Costco Shop Cards can only be purchased or recharged by members. Anyone can use a Costco Shop Card at the gas station, as it also serves as membership authorization for the pump.

Why does Costco “hold” my funds if I use a debit or credit card?

When gasoline is purchased with a debit or credit card, Costco requests a “pre-authorization” before beginning the fueling process. This “pre-authorization” assures that Costco will be paid for the fuel dispensed. The amount “pre-authorized” is the lower of the dollar limit issued by the card issuer or $200. After fuel is dispensed, Costco immediately sends a “completion transaction” notice to the card issuer. It is the card issuer's responsibility to reverse the amount that was “pre-authorized” and deduct the actual amount for the fuel purchased as shown on the receipt. Please call the number on the back of the debit or credit card if you have questions or concerns.

Types of Fuel and Fuel Quality

Is Costco Top Tier certified?

Yes both grades of gasoline sold at Costco meet and exceed Top Tier requirements. The owner’s manuals provided by the following manufacturers recommend using Top Tier gasoline to maintain optimal engine performance. and efficiency.

How does Costco assure that their gasoline is high quality?

There are two aspects of fuel quality that depend on the gasoline brand and the individual retailer; deposit control additive and station maintenance.

What happened to “Clean Power”?

Although we originally referred to our gasoline additives as Clean Power, we determined that Kirkland Signature™ best describes the high quality and great value of our gasoline. Kirkland Signature™ Gasoline same quality product, much simpler name.

What products do you sell?

Regular unleaded (87 octane), Premium unleaded (91 octane), and Diesel (at select locations only).

Where does Costco get its gasoline?

Costco buys fuel from major refineries and distributors in each area. All Kirkland Signature™ Gasoline is fully guaranteed, just like the merchandise inside the warehouse.

What is octane, and is that the only difference between regular unleaded and premium unleaded gasoline?

Octane is a particular hydrocarbon that is part of all gasoline. The precise amount is determined at the refinery. Octane is not an additive to the fuel. Octane levels are the only difference between regular and premium unleaded gasoline sold at Costco.

Safety

How safe are Costco gas stations?

Costco gas stations have an outstanding safety record. Our safety-certified gas station attendants work on the fuel islands, so they are always available to respond to any emergency. Every Costco gas station is equipped with automatic shut off mechanisms both above and below the ground. All of our stations have a dedicated 911 phone, conventional fire extinguishers on every fuel island and automatic extinguishers below ground. Eye wash is always available as well. Gasoline is highly flammable, and we ask for our members to comply with all applicable laws and signage regarding safe fueling.

Is it safe for children to pump gas?

No. Children should not pump gas or get out of the car during the fueling process. Costco gas stations are very busy, and children are often below the level of driver’s mirrors. Only licensed drivers' should pump gas. Costco gas station attendants are available to assist anyone who requires additional help in filling their tank.

Why must I shut off my engine while fueling?

Because it’s the law. The National Fire Code prohibits any potential ignition source, including cigarettes and running engines, while refueling. The National Fire Code is adopted and enforced by various regulatory agencies around the country. To comply, as Costco gas stations feature prominent signage advising our members of these rules. All Costco attendants are instructed to enforce the fire code at our gas stations.

Is there a risk of static electricity while fueling?

There is a small but real risk of static electricity sparking a gasoline vapour fire at any gas station. To prevent a static discharge from igniting gasoline vapor, always touch your car with your bare hand to discharge any accumulated static energy. If you re-enter your car during refueling you may accumulate another charge from your vehicle upholstery. Static may be discharged by touching the car or some other metal surface, away from the fill point, each time you exit your vehicle at a gas station. The shock you feel is your protection.

Can I use my cell phone?

The use of mobile devices is prohibited at Costco gas stations.