Ford F150 Pickup. Instruction - part 1269

Fig. 24: Removing, Swagging & Installing High Pressure (Gyrolok-Type) Fittings 
Courtesy of FORD MOTOR CO. 

Connecting (Gyrolok-Type) Fitting 

Tighten the fitting in 2 stages. Tighten the tube nut until snug. Tighten an additional 1/2 turn. Pressurize fuel 
system and inspect fittings for leaks. See LEAK TEST - ALL BI-FUEL VEHICLES under FUEL SYSTEMS 
in SYSTEM & COMPONENT TESTING - BI-FUEL - GASOLINE/CNG article. 

Spring Lock Coupling 

1. Release fuel pressure. See FUEL SYSTEM PRESSURE RELEASE . Place indicated spring lock 

coupler over coupling. See SPRING LOCK COUPLER IDENTIFICATION table. To release female 
fitting from garter spring, push coupler along tube into coupling. See Fig. 25 .  

2. Pull spring lock coupling apart. Remove coupler from disconnected spring lock coupling. Check for 

damaged garter spring and "O" rings. Wipe end of lines with clean cloth.  

3. To install, place NEW "O" rings onto tube. Lubricate ends of lines with clean engine oil. Locate White 

indicator ring (if equipped), which may have slipped down length of tube. Insert White indicator ring into 
cage of male fitting.  

4. Push fitting together with a slight twisting motion. White indicator ring will pop free of cage to indicate 

that male fitting is properly seated over flared end of female fitting.  

SPRING LOCK COUPLER IDENTIFICATION 

Application

Tool Number

3/8" Line

D87L-9280-A

1/2" Line

D87L-9280-B

5/8" Line

T83P-19623-C

 

2003 Ford Pickup F150 

2003 ENGINE PERFORMANCE Removal & Installation - F150 Pickup - Bi-Fuel - Gasoline/CNG

  

 

2003 Ford Pickup F150 

2003 ENGINE PERFORMANCE Removal & Installation - F150 Pickup - Bi-Fuel - Gasoline/CNG

  

Fig. 25: Disconnecting Fuel Lines With Spring Lock Coupler
Courtesy of FORD MOTOR CO. 

COALESCER DRAINING 

Relieve fuel system pressure. Perform COMPRESSED NATURAL GAS FUEL LINE VENTING under 
FUEL SYSTEM PRESSURE RELEASE. Raise and support vehicle. Remove the drain plug. See Fig. 26 . 
There is an "O" ring attached to the drain plug. The "O" ring must be replaced each time the drain plug is 
removed. Install the drain plug. Lower vehicle. Pressurize the fuel system. 

COALESCER/FUEL FILTER ELEMENT 

Removal & Installation 

1. Release fuel system pressure. Perform COMPRESSED NATURAL GAS FUEL LINE VENTING 

under FUEL SYSTEM PRESSURE RELEASE. Raise and support vehicle. Disconnect negative battery 
cable. Raise vehicle again. Slowly, open one fuel fitting to allow trapped gas to escape.  

2. Remove coalescer/fuel filter drain plug, and drain filter. Reinstall drain plug and "O" ring. Remove 

coalescer/fuel filter. See Fig. 26 . Remove cover and discard "O" ring. Remove and discard filter element. 

3. To install, reverse removal procedure. Tighten fuel fitting. See FUEL LINE FITTINGS . After 

installation is complete, fuel lines and fittings must be leak tested. See LEAK TEST - ALL BI-FUEL 
VEHICLES under FUEL SYSTEMS in SYSTEM & COMPONENT TESTING - BI-FUEL - 
GASOLINE/CNG article.  

NOTE:

DO NOT reuse "O" rings, always replace with NEW "O" rings. "O" rings 
should be coated lightly with an "O" ring lubricant before installation. DO 
NOT use a silicone based grease.

 

2003 Ford Pickup F150 

2003 ENGINE PERFORMANCE Removal & Installation - F150 Pickup - Bi-Fuel - Gasoline/CNG

  

Fig. 26: Identifying Coalescer/Fuel Filter Components 
Courtesy of FORD MOTOR CO. 

FUEL FILLER VALVE 

 

2003 Ford Pickup F150 

2003 ENGINE PERFORMANCE Removal & Installation - F150 Pickup - Bi-Fuel - Gasoline/CNG