Ford F150 Pickup. Instruction - part 1135

1. Raise the vehicle on the hoist.  

2. Remove the fuel tank shield. 

Fig. 3: Locating Fuel Tank Shield Bolts 
Courtesy of FORD MOTOR CO. 

3. Close the fuel tank valve. 

WARNING:

If a confined area, such as a lubrication pit, has been subjected to 
propane gas the area should be inspected for adequate oxygen levels by 
a local health department before being entered or personal injury or death 
may occur.

WARNING:

The fuel system pressure must be relieved before any component can be 
removed. The fuel tanks must be evacuated prior to tank removal. 
Removal of components without pressure relief or tank evacuation can 
cause propane fuel to escape into the air and cause injury or death.

NOTE:

In high ambient temperatures, such as those experienced in desert locations, 
the fuel system is designed to vent excess fuel vapor pressure. The pressure 
relief valve will vent fuel and automatically reset itself.

 

2003 Ford Pickup F150 

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

  

Fig. 4: Locating Fuel Tank Valve 
Courtesy of FORD MOTOR CO. 

NOTE:

There will still be residual pressure present.

 

2003 Ford Pickup F150 

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

  

Fig. 5: Locating Fuel Selector Switch 
Courtesy of FORD MOTOR CO. 

4. Set the fuel selector switch to "ALT" and run the vehicle until the indicator lamp goes out.  

5. To pressurize the system, slowly open the valve and reverse the procedure.  

PRESSURE RELIEF - NATURAL GAS BI-FUEL SYSTEM 

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:

It is important that your bi-fuel vehicle be correctly maintained by Ford bi-
fuel trained personnel. If a concern occurs, it is important that correctly 
trained personnel diagnose the cause. If a concern relates to the fuel 
system, correct part replacement is imperative to keep your vehicle 
operating at normal performance. Bi-fuel components and gasoline 

 

2003 Ford Pickup F150 

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

  

1. Raise the vehicle on the hoist.  

2. Remove the fuel tank shield. 

specific components are not interchangeable. If your vehicle is not 
serviced in accordance with bi-fuel service procedures, damage can 
occur and your warranty may be invalidated.

WARNING:

Fuel supply lines are always pressurized. When servicing fuel related 
components, do not smoke or carry lighted tobacco or an open flame of 
any type. Flammable mixtures may be present and can ignite, resulting in 
personal injury.

WARNING:

The natural gas fuel system is always pressurized to 655 kPa (95 psi) 
downstream of the fuel pressure regulator and up to 24821 kPa (3,600 psi) 
upstream of the fuel pressure regulator. Use care when servicing the fuel 
system or personal injury can occur.

WARNING:

The natural gas fuel supply manifold is pressurized to 655 kPa (95 psi). 
Fuel pressure must be relieved prior to any fuel system service.

WARNING:

The fuel system pressure must be relieved before any component can be 
removed. The fuel tanks must be evacuated prior to tank removal. 
Removal of components without pressure relief or tank evacuation can 
cause natural gas to escape into the air and cause injury or death.

 

2003 Ford Pickup F150 

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