NATURAL GAS SYSTEM
Compressed Natural Gas
DO NOT modify system configuration or components, or replace components with parts not specially designed
for use with natural gas. Manufacturer has specially designed the materials, components and system
configuration for natural gas vehicles, and each particular system is precisely calibrated for efficient operation.
Use of different parts or materials can produce an untested configuration that could result in fire or personal
injury, or cause engine damage. It is important the natural gas vehicle be properly maintained by natural gas
trained personnel. If a problem occurs, it is important that properly trained personnel diagnose the cause. If
problem relates to fuel system, proper part replacement is imperative to keep vehicle operating at normal
performance. Natural gas components and gasoline fuel components are not interchangeable. If vehicle is not
serviced in accordance with natural gas-fueled vehicle procedures, damage can occur and warranty may be
invalidated.
DO NOT smoke or carry lighted tobacco or open flame of any type when working on or near any fuel-related
components. Highly flammable mixtures are always present and may be ignited. Failure to follow these
instructions may result in personal injury. Fuel supply lines will remain pressurized after engine shutdown.
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. Observe all warnings
when performing the natural gas leak test. See COMPRESSED NATURAL GAS LEAK TEST under FUEL
SYSTEMS.
Inertia Fuel Shutoff Switch Reset Procedure
CAUTION: Natural gas in fuel system is at high pressure at all times. To avoid injury
or fire, release fuel pressure from fuel system before disassembling any
fuel system component. To release fuel system pressure, follow pressure
relief procedure. See FUEL SYSTEM PRESSURE RELEASE in appropriate
REMOVAL & INSTALLATION article. After performing fuel system pressure
relief procedure, a small amount of pressure 3 psi (21 kPa) will remain in
fuel rail, and high pressure still exists in fuel tanks. Prevent combustion
from escaping fuel; no smoking, open flames or any kind of arcing.
NOTE:
Compressed Natural Gas (CNG) may also be referred to as natural gas. Natural
gas is lighter than air.
WARNING:
Use care to prevent combustion from fuel spillage. No smoking, open
flames or any kind of arcing.
WARNING:
If you see or smell gasoline at any time other than during fueling, DO NOT
reset Inertia Fuel Shutoff (IFS) switch.
NOTE:
With IFS in CLOSED position, reset button can be depressed an additional 1/16"
against the spring.
2003 Ford Pickup F150
2003 ENGINE PERFORMANCE System & Component Testing - CNG