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Refueling : Step-by-Step

NGV Fueling Step-By-Step at a Modern CNG Fueling Station

​​Fueling a compressed natural gas (CNG) vehicle is similar to fueling a gasoline-powered car.

Dispensers with a flexible hose

For a dispenser with a flexible hose:

  1. Make sure the arrow on the knob points away from the hose in the off position.
  2. Connect the nozzle by pulling back the sleeve and pushing it over the fitting on your vehicle. The nozzle will seal tightly and lock into place. Note: In a bi-fuel vehicle, you may have to remove the gasoline cap before connecting the nozzle.
  3. Turn the lever so the arrow points toward the hose to pressurize the hose.
  4. Swipe your debit or credit card and flip switch the switch on the dispenser. Natural gas will flow, and you will hear the dispenser turn on and off as it gathers information on temperature and pressure. A gauge on the dispenser will tell you when your tank is full and stop automatically. It is impossible to overfill a CNG tank.
  5. Disconnect the hose, return it to the dispenser and replace all fuel caps.

Sherex/OPW dispensers with a yellow fitting

For a Sherex/OPW dispenser with a yellow fitting on the end of the hose:

  1. Turn the lever counterclockwise to retract the coupling teeth.
  2. Connect the nozzle and turn the lever clockwise to lock it into place. Note: In a bi-fuel vehicle, you may have to remove the gasoline cap before connecting the nozzle.
  3. Swipe your debit or credit card and flip the switch on the dispenser. Natural gas will flow, and you will hear the dispenser turn on and off as it gathers information on temperature and pressure. A gauge on the dispenser will tell you when your tank is full and stop automatically. It is impossible to overfill a CNG tank.
  4. Disconnect the hose, return it to the dispenser and replace all fuel caps.

Buses and Large Trucks

Some stations have dispensers designed specifically for large vehicles such as buses and large trucks. Do not use this dispenser for any other type of vehicle.

Dispenser Pressure

Each pump is equipped to deliver CNG at either 3,600 or 3,000 pounds per square inch (PSI). Review the proper listing at the top of each unit. If your vehicle is not rated to accept CNG at a certain pressure, do not use that unit. Doing so could result in serious injury. You can find your vehicle rating by checking inside the fuel door or in your owner's manual.​​​​​​​​


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