Fueling FAQ's

Provided below are answers to some of the most frequently asked questions that we receive. The information is organized into two separate sections, one for consumers, and one for retailers. If you have a question and you are unable to find the answer on our website, please contact the Weights and Measures Services Division at 602-542-4373 or [email protected].


Q: Why can I dispense 20 gallons of gasoline into my vehicle tank when my owner's manual says that my vehicle has a 19-gallon tank?

A: For most vehicles, the tank capacity listed in your owner's manual is only an approximation. In reality, your fuel tank may hold more or less than the volume stated. In addition, tank volume discrepancies may be caused by:

  • The slope of the ground in front of the fuel dispenser
  • The volume at which the auto-shutoff activates (may vary depending on the nozzle)
  • "Topping-off... attempting to dispense fuel into your tank after the auto-shutoff activates. This practice is not recommended and you may overfill your tank or unknowingly dispense fuel into the vapor space of your tank
  • The accuracy of your fuel gauge (including the angle at which the fuel gauge is read)


Q: Does the Weights and Measures Services Division regulate the price of gasoline?

A: No, we do not regulate fuel prices. 


Q: Are fuel dispensers in Arizona required to have approval seals from the Weights and Measures Services Division?

A: No, the approval seals are affixed to indicate that the device in question was inspected by the Weights and Measures Services Division and found to meet all applicable tolerances and requirements at the time of inspection. A fuel dispenser may not have an approval seal for a variety of reasons including:

  • The dispenser was in violation at the time of inspection and the investigator initiated enforcement action (see next question regarding enforcement action).
  • The dispenser was recently re-branded, re-faced, or repainted.
  • The dispenser was recently installed and has not been inspected by Weights and Measures.
  • The approval seal was illegally removed or became detached from the dispenser.

Certain labels are required to be posted on fuel dispensers. See our Guide to Dispenser Labeling in Arizona for more information.


Q: I saw a yellow Weights and Measures tag on a fuel dispenser. What does that tag mean?

A: The Weights and Measures Services Division has three different enforcement tags. These tags are described below.

Warning Tag: These tags are yellow in color and signify that the inspected device or commodity is not in compliance with applicable requirements, and a time frame to correct (usually 7 days or 30 days) has been issued. Yellow tags indicate that the device or commodity in question requires corrective action that must occur within the specified time frame. The location may continue to use the device commercially or sell the commodity during this time frame. If the time frame passes and the corrective action has not occurred, investigators will then issue an Out of Service or Stop-Sale, Stop-Use tag (see below).

Out of Service Tag: These tags are red in color and signify that the inspected device is not in compliance with applicable requirements and may not be used until the violation is corrected. A Registered Service Representative must repair the device and submit a report to the Division with information regarding the repair before the device may be placed back into service. If you see a business using a device with a red tag attached, please contact us at 602-542-4373 or [email protected].

Stop-Sale, Stop-Use Tag: These tags are blue in color and signify that the inspected commodity or vapor recovery system is not in compliance with applicable requirements and may not be sold or used until the violation is corrected. Before removing a Stop-Sale, Stop-Use tag, the location or a Registered Service Representative must call and obtain verbal permission to remove the tag. If you see a business selling a commodity or using a device that has a blue tag attached, please contact the Division at 602-542-4373 or [email protected].


Q: I prepaid for fuel and the pump was really slow when it approached the preset dollar amount? Was I shorted the amount of fuel that I paid for?

A: The fuel dispenser is designed to slow the flow of fuel when approaching the preset dollar amount. The dispenser meters are manufactured to deliver fuel accurately during normal and slow flow settings. 


Q: What do I do if I activate a dispenser and it shows a dollar amount such as $0.03 before I even start to dispense fuel?

A: It is called a meter jump, and should be reported to the Division. Fuel dispensers are required to start the delivery at zero. File a complaint online, or contact the Division at 602-542-4373. Be sure to provide us with the location address, pump number, and grade of fuel.


Q: What is Arizona Cleaner Burning Gasoline (CBG) and why do I have to use it?

A: The United States Environmental Agency (EPA) classified the Phoenix Metropolitan Area as a serious non-attainment area (did not meet federal regulations for clean air) for certain air pollutants. Since some of the greatest contributors to poor air quality are motor vehicles, the fuel used to run these vehicles was targeted as a major component to help clean our air. Arizona CBG refers to the gasoline specifications required in Maricopa County and Area A. This special gasoline blend contributes to the reduction in harmful vehicle emissions.


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