F 150 2WD Pickup V8-5.4L Prop SOHC VIN Z (1998)
Fuel Injector Driver Module (CNG): All Technical Service Bulletins
Fuel System (LPG) - No Start Condition
Article No
03-10-4
05/26/03
DRIVEABILITY - BI-FUEL LPG LOW FLOW INJECTOR
SERVICE ASSEMBLY WITH COOLANT LOCK-OFF
FORD:
1998-1999 E SERIES, F-150, F-250
Article 02-10-6 is being republished in its entirety to update the model coverage.
ISSUE
Some 1998-1999 B-Fuel LPG vehicles (With Coolant Lock off) may exhibit a no start condition. This may be caused by stuck Low Flow Injectors on the
Compuvalve possibly due to fuel contamination. To avoid the replacement of the Compuvalve when only the Low Flow Injectors have tailed, the Low
Flow Injectors have been released separately for service.
ACTION
If diagnosis leads to failed Low Flow Injectors, refer to the following removal and installation procedure to replace the Low Flow Injector assembly.
SERVICE PROCEDURE
WARNING
WHEN SERVICING FUEL RELATED COMPONENTS, ELIMINATE ALL SOURCES OF IGNITION (E.G. TORCHES, HEATERS, AND
LIGHTED TOBACCO). FLAMMABLE MIXTURES MAY BE PRESENT AND CAN IGNITE, RESULTING IN DAMAGE AND/OR INJURIES.
THE FUEL SYSTEM LINE PRESSURE MUST BE RELIEVED BEFORE ANY COMPONENT CAN BE REMOVED. REMOVAL OF
COMPONENTS WITHOUT PRESSURE RELIEF CAN CAUSE AN UNCONTROLLED RELEASE OF PROPANE AND MAY RESULT IN
DAMAGE AND/OR INJURIES.
PRELIMINARY PREPARATION
1.
Relieve system line pressure and remove the Compuvalve from the vehicle. Refer to Service Manual GFIP163 for the 1998 LPG Bi-Fuel model
year. For 1999 model year Bi-Fuel LPG vehicles refer to the Ford Truck Workshop Information Section 303-04E.
NOTE
ONCE THE SYSTEM IS DISCONNECTED, COVER ALL OPEN HOSE FITTINGS AND ELECTRICAL CONNECTIONS TO AVOID
CONTAMINATION.
2.
Ensure that all loose debris is removed from the injector area, to avoid contamination during removal.
3.
Place the Compuvalve flat on a work bench (with injectors facing up).
NOTE
ENSURE THAT THE BENCH SURFACES ARE CLEAN AND DIRT FREE. BENCHES SHOULD BE COVERED TO AVOID SCRATCHING
COMPONENT SURFACES.
REMOVAL OF LOW FLOW INJECTOR ASSEMBLY
NOTE
DURING THE REMOVAL OF THE LOW FLOW INJECTORS, CARE SHOULD BE TAKEN TO PREVENT ANY DEBRIS FROM ENTERING
THE FUEL FLOW OPENINGS.