2003 FORD F150 engine

Use caution when servicing or maintaining any of the components of
your Gaseous Fuel Injection System.
Do not modify the gaseous fuel injection system configuration or
components. Do not replace the gaseous fuel injection system
components with parts not designed for use with your Bi-fuel vehicle.
Components designed for use in your CNG or LPG Bi-fuel vehicle
consist of special materials and are calibrated especially for your
vehicle. Failure to use the correct components may cause damage to
the engine and fuel system or possible personal injury.
Service to the gaseous fuel injection system components must be
conducted only at qualified dealerships by qualified service
technicians. Failure to do so may cause damage to the engine and fuel
system components or possible personal injury.
Any modification to your Gaseous Fuel Injection System voids the Ford
New Vehicle Limited Warranty.
Do not use liquefied natural gas (LNG) or a CNG that is derived
from a process such as flashing (heating LNG). Failure to use the
correct type of fuel may cause damage to the engine and fuel
system components.
If the vehicle is involved in an accident or fire that damages any
portion of the gaseous fuel injection system, the damaged
components MUST be replaced and the complete system tested by
a qualified service technician before the vehicle is operated
again.
If yourBi-fuelvehicle is to be painted, the CNG or propane fuel tank(s)
and fuel lines must be emptied before the vehicle is placed in a heated
room, known as a“paint oven”, for the new paint to cure. These“paint
ovens”typically operate at temperatures up to 60°C (140°F). The high
temperatures in the“paint oven”could cause the fuel in the fuel tanks to
expand, which may cause an overpressure condition within the fuel tanks
that can be hazardous to personal safety and property. Contact your
qualified Ford dealership for assistance.
Introduction
5

Labels similar to these are located in
the engine compartment and
contain diagnostic information for
your gaseous fuel injection system.
Compressed natural gas (CNG)
This label is located on the right
rear of your vehicle and identifies
the vehicle as using compressed
natural gas (CNG) as a fuel.
This warning label is located in the
engine compartment to help ensure
safe and proper maintenance of the
CNG fuel system.
Introduction
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This label is located in the engine
compartment and on the CNG
tank(s) and lists the inspection and
expiration dates for the CNG fuel
tank(s).
Liquefied petroleum gas (LPG)
This label is located on the right
rear of your vehicle and identifies
the vehicle as using liquefied
petroleum gas (LPG) as a fuel.
This warning label is located on
either the driver’s side sun visor or
on the dashboard to help inform you
of cold weather operating conditions
when using LPG as a fuel.
This warning label is located in the
engine compartment to help ensure
safe and proper maintenance of the
LPG fuel system.
Introduction
9

GASEOUS FUEL COMPONENT IDENTIFICATION
The following illustrations show the major unique gaseous fuel injection
system components of yourBi-fuelvehicle. All of these unique
components are constructed of special materials to withstand the effects
of CNG or LPG use (depending upon application).NEVERreplace a
uniqueBi-fuelvehicle component with a standard vehicle component or
any aftermarket components.
Do not modify the gaseous fuel injection system configuration or
components. Do not replace the gaseous fuel injection system
components with parts not designed for use with your Bi-fuel vehicle.
Components designed for use in your CNG or LPG Bi-fuel vehicle
consist of special materials and are calibrated especially for your
vehicle. Failure to use the correct components may cause damage to
the engine and fuel system or possible personal injury.
Compressed natural gas (CNG)
•Typical compressed natural gas (CNG) fuel system shown.
1.Fuel tank —CNG fuel cylinder. Depending upon application, more
than one fuel tank may be used.
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10

2.Solenoid tank valve—One electronically-actuated (normally closed)
solenoid valve that will automatically stop the flow of CNG from the fuel
tank(s) when the engine is turned off.
3.CNG fueling point—Allows refueling of the CNG fuel tank(s) using
standard automotive natural gas dispensing equipment.
4.Coalescent fuel filter—Removes impurities from the natural gas
before it enters the high pressure fuel regulator.
5.High pressure fuel regulator—Reduces fuel pressure from the fuel
tank(s) to 690 kPa (100 psi).
6.Alternative fuel control module—Controls the quantity of natural
gas being delivered to the engine as vehicle speed and load requirements
demand.
7.Fuel selector switch—Allows you to select the fuel you want to use
(CNG or unleaded gasoline).
Liquefied petroleum gas (LPG)
•Typical liquefied petroleum gas (LPG) fuel system shown.
1.Fuel tank—LPG fuel cylinder.
2.Outage valve—80% outage valve prevents overfilling of the LPG fuel
tank(s).
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Introduction
11

3.LPG fueling point—Allows refueling of the LPG fuel tank(s) using
standard automotive LPG dispensing equipment.
4.Supply valve—Some applications are equipped with fuel tank(s) that
have a manually-actuated supply valve which can be used to stop the
flow of LPG to the engine, if necessary.
5.Fuel filter—Removes impurities from the LPG fuel before it enters
the fuel vaporizer/regulator.
6.Fuel vaporizer/regulator—Helps convert the LPG from a liquid to a
gaseous state. Provides gaseous propane at a constant operating pressure
to the Compuvalve.
7.Computer and metering valve assembly (Compuvalve)
—Controls the quantity of gaseous propane being delivered to the engine
as vehicle speed and load requirements demand.
8.Fuse and relay module—Contains the necessary electrical fuses and
relays required to operate your Gaseous Fuel Injection System.
9.Fuel selector switch—Allows you to select the fuel you want to use
(LPG or unleaded gasoline).
Introduction
12

FUEL SELECTOR SWITCH
This booklet supplements your Owner’s Guide and is part of the owner’s
portfolio. It describes the operation of yourBi-fuelvehicle and how it
differs from a standard gasoline powered vehicle. Therefore it is very
important that you read this guide and thoroughly familiarize yourself
and others operating the vehicle with this information.
The fuel selector switch allows you to select which fuel yourBi-fuel
vehicle will operate on.
The fuel selector switch only operates when the vehicle is at a
stop with the ignition in the OFF position. If the fuel selector
switch is moved while the vehicle is running, the gaseous fuel
injection system will NOT automatically change fuel modes and
no damage to the vehicle will occur.
Prior to starting the vehicle (with the ignition in the OFF position),
determine which fuel you would like to use and press the rocker switch
located on the dash panel.
When the selector switch is placed
in the ALT position, your engine will
operate in the gaseous fuel mode,
running on CNG or LPG (depending
upon application).
•A green indicator light will
illuminate on the fuel selector
switch to indicate that the vehicle is operating in the gaseous fuel
mode (CNG or LPG , depending upon application).
•The green indicator light operates independently of the fuel selector
switch and is controlled by the compuvalve.
When the selector switch is placed
in the GAS position, your engine will
operate in the unleaded gasoline
mode.
If the CNG or LPG (depending upon application) runs low during the
operation of the vehicle in the gaseous fuel mode, the gaseous fuel
injection system will automatically change to the unleaded gasoline
operating mode. The green indicator light on the fuel selector switch will
turn off to show the vehicle has changed to the unleaded gasoline
operating mode.
ALT
GAS
ALT
GAS
Instrumentation and controls
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The vehicle’s fuel system will NOT automatically change to the
gaseous fuel mode (CNG or LPG , depending upon application), if
the level of the unleaded gasoline runs low.
FUEL GAUGE
The fuel gauge in your CNG or LPGBi-fuelvehicle (depending upon
application) behaves similarly to a standard gasoline fuel gauge. The fuel
gauge will provide a linear reading from Full down to Empty.
•Fuel gauge operation for aLPG Bi-fuelvehicle is based on a float
type sensor measuring the level of the liquid propane in the fuel
tank(s).
•Fuel gauge operation for aCNG Bi-fuelvehicle is based on the
pressure and temperature of the natural gas in the fuel tank(s).
Depending upon the application, a full fuel gauge reading will occur at
a pressure of approximately 20 700 kPa (3 000 psi) or 24 800 kPa (3
600 psi) at a temperature of approximately 21°C (70°F). For more
information on fuel gauge performance during the fast-fill method of
CNG fueling, refer toRefueling your Bi-fuel vehiclein the
Maintenance and carechapter of this supplement.
WARNING LIGHTS
With the engine running, the“Check Engine/Service Engine Soon”
indicator light (depending upon application) will illuminate on the
instrument cluster when the On Board Diagnostics System and/or the
Gaseous Fuel Injection System detects a malfunction in one of the
engine’s emission controls. For more information, refer toWarning light
and chimesin theInstrumentationchapter of your Owner’s Guide and
this supplement.
If a malfunction of the LPG Gaseous
Fuel Injection System is detected
with the engine running in the
gaseous fuel mode, the green
indicator light on the fuel selector
switch will flash on and off.
The warning lights may illuminate or flash on and off (depending upon
application) without a driveability concern being noted. The vehicle will
usually be drivable and will not require towing. Contact a qualified Ford
dealership at the first available opportunity.
GASALT
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