Ford F150 Pickup. Instruction - part 1137

Fig. 9: Disconnecting Fuel Line 
Courtesy of FORD MOTOR CO. 

2. Slowly disconnect the fuel line.  

3. Connect a propane hose to the fuel tank valve and to an approved holding tank supply valve. 

4. Slowly open the valve on the fuel tank and the holding tank.  

5. Open the fixed liquid level valve on the holding tank.  

6. Fully close the supply valves on the fuel and the holding tank if no liquid appears. If liquid is present 

continue to evacuate the fuel tank.  

7. Disconnect the propane hose from both tanks.  

FUEL TANK EVACUATION - NATURAL GAS 

Special Tool(s) 

NOTE:

If the supply valve is opened too fast, the excess flow valve will close.

 

2003 Ford Pickup F150 

2003 GENERAL INFORMATION Fuel System-General Information-Bi-Fuel - F150 Pickup

  

Fig. 10: Identifying Special Tools For Evacuating Fuel Tank - Natural Gas 
Courtesy of FORD MOTOR CO. 

WARNING:

The fuel supply lines will remain pressurized after engine shutdown. 

 

2003 Ford Pickup F150 

2003 GENERAL INFORMATION Fuel System-General Information-Bi-Fuel - F150 Pickup

  

1.  

2. The following procedures are required to be used when venting fuel from the fuel tanks in order to 

remove fuel tanks.  

SOLENOID - FUNCTIONS NORMALLY 

When servicing fuel-related components, do not smoke or carry 
lighted tobacco or any open flame of any type. Flammable gases 
may be present and ignite, resulting in possible personal injury.

WARNING:

Do not modify the system configuration or components or replace 
components with components no specifically designed for use with 
natural gas. Ford Motor Company has specifically designed the 
materials, components and system configuration for the 5.4L F-
Series Bi-Fuel vehicle, and each particular system is precisely 
calibrated for efficient operation. The use of different parts or 
materials can produce an untested configuration that can result in 
fire or personal injury or cause engine damage.

WARNING:

Fuel line venting is required prior to fuel system component service.

WARNING:

Eye and ear protection are required to be worn during venting, or 
removal and installation, of fuel system components.

WARNING:

The status (stuck open, stuck closed, does not operate or good) of 
each fuel tank solenoid valve must be identified prior to venting the 
fuel tanks.

NOTE:

It is recommended that venting be performed with a vent stack. A typical 
vent stack installation is shown in Typical Vent Stack Installation . This is 
a typical installation only. Any vent stack installation must be approved by 
local authorities.

NOTE:

Do not vent any fuel tank unless a new fuel tank or a new fuel tank 
solenoid valve is installed. Unnecessary venting of good tanks can cause 
damage to the fuel tank solenoid valve.

NOTE:

On vehicles equipped with an extended range fuel tank, the jackscrew can 
be reached through an access hole in the vapor retaining cover.

 

2003 Ford Pickup F150 

2003 GENERAL INFORMATION Fuel System-General Information-Bi-Fuel - F150 Pickup

  

Fig. 11: Identifying Tightening Torque Of Instruction Lockdown Valve Jackscrew 
Courtesy of FORD MOTOR CO. 

1. Turn in the instruction lockdown valve jackscrew on the fuel tank solenoid valve(s).  

2. Release the fuel system pressure. Refer to PRESSURE RELIEF - Natural Gas Bi-Fuel System .  

3. Disconnect the fuel fill line from the fuel fill valve. 

 

2003 Ford Pickup F150 

2003 GENERAL INFORMATION Fuel System-General Information-Bi-Fuel - F150 Pickup