Fuel Delivery and Air Induction: Service and Repair

WARNING:
^ DO NOT SMOKE OR CARRY LIGHTED TOBACCO OR OPEN FLAME OF ANY TYPE WHEN WORKING ON OR NEAR ANY FUEL-RELATED COMPONENTS. HIGHLY FLAMMABLE MIXTURES ARE ALWAYS PRESENT AND MAY BE IGNITED. FAILURE TO FOLLOW THESE INSTRUCTIONS MAY RESULT IN PERSONAL INJURY.
^ 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.

1. Start the vehicle and idle at 1,500 rpm for five minutes, then turn the engine off. If the vehicle won't start due to clogged injectors, the injectors may be completely stuck closed. If this is the case, attempt to free them by applying 12 volts directly to the injector coil.
1 Apply battery voltage to the injector coil where the red wire from circuit 361 connects.
2 Ground the other side of the connector momentarily and listen for an audible click to confirm injector opening.
3 If an injector remains stuck, wait ten seconds and repeat the above steps. If an injector remains stuck, install a new injector.

CAUTION: Do not ground an injector for more than ten seconds, prolonged exposure may result in damage to the injector.

NOTE: If an injector does not produce an audible click after three attempts to energize the coil, install a new injector.

2. Vent the fuel lines.







3. Remove the bolts and position the fuel pressure regulator shield aside.

NOTE:
^ Lubricate the fuel system O-ring seals with clean engine oil prior to installation to hold the seals and ease the installation.
^ Install new fuel system O-ring seals, using approved O-ring seals only. O-ring seals that are approved for natural gas use are identified with a yellow stripe.







4. Remove the filter bowl drain plug and discard the O-ring seal. Install the drain plug and install a new O-ring seal when finished.
^ Lubricate the O-ring seal with clean engine oil.

NOTE: Make sure of correct drain plug sealing by installing the new drain plug O-ring seal, using the specified lubricant. Verify the O-ring seal has not been twisted and is fully seated.


5. Remove the filter bowl and discard the O-ring seal.
6. Check for dirt or oil in the filter bowl. Clean as necessary.







7. Inspect the filter element. If it appears to be discolored with dark deposits, install a new filter element.
8. Fill the filter bowl to the top with isopropyl alcohol (with a strength of at least 90 percent by volume) with the filter in place.







9. Install the filter bowl.

NOTE: To make sure of correct bowl-to-housing sealing, verify that the O-ring seal is fully seated into the bowl O-ring seal groove.

10. Start the engine and idle at 1,500 rpm for five minutes.

11. Check the system for leaks.