F 150 Heritage 4WD Pickup V8-5.4L SOHC VIN Z Bi-fuel (2004)
Fuel Pressure Release: Service and Repair
Bi-Fuel Models
With CNG
PRESSURE RELIEF
WARNING:
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Do not modify the system configuration or components. Do not install components not 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.
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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.
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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.
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The natural gas fuel system is always pressurized to 655 kPa (95 psi) downstream of the fuel pressure regulator and up to 24,821 kPa
(3,600 psi) upstream of the fuel pressure regulator. Use care when servicing the fuel system or personal injury can occur.
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The natural gas fuel supply manifold is pressurized to 655 kPa (95 psi). Fuel pressure must be relieved prior to any fuel system service.
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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. connectors.
1. Raise the vehicle on the hoist.
2. Remove the fuel tank shield.
3. Disconnect the connectors.
