Fuel System: Notes

WARNING: Do not modify the system configuration or components, or install components or parts not specially designed for use with natural gas. Ford Motor Company has specially designed the materials, components and system configuration for the 4.6L Crown Victoria natural gas vehicles, and each particular system is precisely calibrated for efficient operation. The use of different parts or materials can produce an untested configuration that could result in fire or personal injury, or cause engine damage.

NOTE: It is important that your natural gas vehicle be correctly maintained by Ford natural gas trained personnel. If a problem occurs, it is important that correctly trained personnel diagnose the cause. If the problem relates to the fuel system, correct new part installation is imperative to keep your vehicle operating at normal performance. Natural gas components and gasoline fuel components are not interchangeable. If your vehicle is not serviced in accordance with natural gas-fueled vehicle procedures, damage can occur and your warranty may be invalidated.

NOTE: All standard production components and systems receive routine service under base warranty procedures.

When servicing the fuel system, observe the following information:

All 4.6L CNG engines use a closed-type positive crankcase ventilation (PCV) system and an exhaust emission system to control engine emissions within government specifications.
To maintain the required exhaust emission levels, the fuel system must be kept in correct operating condition.
The natural gas fuel system must be adjusted to specifications.
Additional engine performance checks are required to keep the exhaust emissions at the specified minimum pollutant level.

This article covers general procedures related directly to the fuel system.