Ford 2004 Mustang Owner's Manual page 10

Servicing your vehicle
ADAPTERS
DO NOT use fuel receptacle adapters when refueling your vehicle.
The profiles of both the natural gas vehicle receptacle and the fuel
station nozzles are specified by ANSI/AGA NGV1-1994, CGA NGV1-M94.
These profiles are specified for compressed natural gas vehicles and fuel
stations for safety purposes. Three separate adapter profiles are
available. P24, P30 and P36 respectively, are specified for the three
different service pressures of 16,500 kPa (2,400 psi), 20,700 kPa
(3,000 psi) and 24,800 kPa (3,600 psi).
Your vehicle's service pressure may be 20,700 kPa (3,000 psi) or 24,800 kPa
(3,600 psi), depending upon application. Refer to the label on the fuel filler
door:
• If your vehicle's fuel system is rated at 20,700 kPa (3,000 psi), it can
be refueled using a P30 or P24 nozzle. However, use of a P24 nozzle
will result in an incomplete fill.
• If your vehicle's fuel system is rated at 24,800 kPa (3,600 psi), it can
be refueled using a P36, P30 or P24 nozzle. However, use of a P30 or
P24 nozzle will result in an incomplete fill.
DO NOT over pressurize the CNG fuel system or damage to the
fuel system and possible personal injury may occur.
NATURAL GAS DISPENSING
Do not use liquefied natural gas (LNG) or a CNG that is derived
from a process such as flashing (heating LNG). Failure to use the
correct type of fuel may cause damage to the engine and fuel
system components.
Most dispensers have a digital indicator displaying the cost and amount
of fuel delivered to your vehicle. Fuel delivery to the vehicle is stopped
when the pressure of fuel stored on the vehicle equalizes with the
temperature compensated pressure of fuel stored at the station. As the
pressure between the station and vehicle equalizes, the cost and quantity
meters slow to a near stop. When this occurs, refueling is complete.
Certain noises can be expected during the refueling process and may
vary depending on the type of fuel station and your proximity to the fuel
compression and storage equipment. At the beginning of refueling you
might hear the rushing noise of gas entering the vehicle through the
station hose and tubing. At the end of refueling, the fuel receptacle on
the vehicle may make a high pitch noise or chatter. This is another
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