Fuel System

WARNING:
- DO NOT MODIFY THE SYSTEM CONFIGURATION OR COMPONENTS, OR REPLACE COMPONENTS WITH PARTS NOT SPECIALLY DESIGNED FOR USE WITH NATURAL GAS. FORD MOTOR COMPANY HAS SPECIALLY DESIGNED THE MATERIALS, COMPONENTS AND SYSTEM CONFIGURATION FOR THE 5.4L ECONOLINE 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.
- IT IS IMPORTANT THAT YOUR NATURAL GAS VEHICLE BE PROPERLY MAINTAINED BY FORD NATURAL GAS TRAINED PERSONNEL. IF A PROBLEM OCCURS, IT IS IMPORTANT THAT PROPERLY TRAINED PERSONNEL DIAGNOSE THE CAUSE. IF THE PROBLEM RELATES TO THE FUEL SYSTEM, PROPER PART REPLACEMENT 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 5.4L 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 proper 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.

Always refer to the Master Parts Catalog for parts usage and interchangeability before replacing any component of the fuel system.

Coalescer/Filter Assembly:

Coalescer/Filter
Natural gas vehicles are equipped with a coalescer/filter assembly. The coalescer/filter assembly separates, filters and stores any contamination and moisture found in the fuel system, preventing moisture from entering the engine.







Typical Vent Stack Installation
Refer to the illustration for a typical vent stack installation.