Ford F150 Pickup. Instruction - part 1134

This section covers general procedures related to the bi-fuel components of the fuel system. 

Always refer to the Master Parts Catalog for parts usage before installing any component of the bi-fuel fuel 
system. 

FUEL SYSTEM - NATURAL GAS 

When servicing the fuel system, observe the following information:

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 
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 (3600 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

  

z

All 5.4L engines equipped with the propane bi-fuel option are equipped with closed-type positive 
crankcase ventilation (PCV) system and an exhaust emission system to control engine emissions within 
government specifications.  

z

To maintain the required exhaust emission levels, the fuel system must be kept in correct operating order. 

z

The bi-fuel fuel system must be adjusted to the specifications.  

This section covers general procedures related to the bi-fuel components of the fuel system. 

Always refer to the Master Parts Catalog for parts usage before installing any component of the bi-fuel fuel 
system. 

Typical Vent Stack Installation 

Refer to Fig. 2 for a typical vent stack installation. 

NOTE:

Local regulations must be followed on installing vent stacks. Regulations vary 
from state to state and country to country. Contact your local gas utility for 
further details.

 

2003 Ford Pickup F150 

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

  

Fig. 2: Identifying Vent Stack 
Courtesy of FORD MOTOR CO. 

DIAGNOSIS AND TESTING 

 

2003 Ford Pickup F150 

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

  

FUEL SYSTEM - BI-FUEL SYSTEMS 

Refer to SELF-DIAGNOSTICS - BI-FUEL - GASOLINE/LPG . 

GENERAL PROCEDURES 

PRESSURE RELIEF - LIQUID PROPANE GAS BI-FUEL SYSTEM 

WARNING:

Avoid inhaling propane gas or occupying confined areas containing 
propane. Propane is heavier than air. The heavier gas can displace or 
push fresh air out of an area. In large quantities, propane can displace 
enough oxygen to make the surrounding air unfit to breathe and possibly 
cause illness. If a person breathes propane gas or air that lacks oxygen 
due to the presence of propane gas, headache, dizziness, and weakness 
in the extremities can occur. In severe cases, prolonged breathing of 
propane-fouled air can cause suffocation. In the event of illness from 
inhaling propane gas, move the victim immediately to fresh air and 
contact a physician or medical emergency personnel for artificial 
respiration or other required treatment.

WARNING:

Do not needlessly vent propane fuel during service, and do not open the 
80% stop-fill valve while a vehicle is inside a building. When servicing the 
fuel system, follow the recommended procedures to shut off the fuel 
tanks and run the engine out of fuel before disconnecting the fuel system 
components. If the fuel tank(s) are being serviced, have the fuel 
evacuated by trained personnel at a local propane fuel station. Liquid 
propane fuel vaporizes at normal barometric pressure at temperatures 
above -42°C (-44°F), and expands to 270 times its volume as a liquid. 
Unnecessary venting of propane fuel can create fire and health hazards 
which could cause personal injury or death.

WARNING:

Be alert for situations that may cause the propane fuel system to vent 
fuel. These include extremely hot days, parking near a space heater, or 
hoisting a vehicle up near a ceiling heater. Release of propane fuel in a 
confined area through the pressure relief valve could occur. The release 
of propane fuel in a confined area could result in an accumulation of 
flammable vapors. If fuel is vented near a heat source, a fire or explosion 
could occur.

WARNING:

Do not use paint drying ovens for propane fueled vehicles. The heat of 
paint drying ovens will increase the pressure in the fuel tanks. This could 
cause venting of propane fuel vapor into the oven and result in a fire from 
the heat or sparks in the electrical equipment. If the fuel is confined inside 
an oven an explosion may occur. When refinishing the body panels of a 
propane fueled vehicle use spot painting and drying methods.

 

2003 Ford Pickup F150 

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