F 150 Heritage 4WD Pickup V8-5.4L SOHC VIN Z Bi-fuel (2004)
Fuel Pressure Regulator: Service and Repair
Bi-Fuel Models
Fuel Tank and Lines
FUEL PRESSURE REGULATOR - NATURAL GAS
REMOVAL
WARNING:
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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.
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It is important that your bi-fuel vehicle be properly maintained by Ford bi-fuel trained personnel. If a concern occurs, it is important that
properly 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 repair.
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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.
1. Relieve the natural gas fuel system pressure.
2. Disconnect the battery ground cable.
3. Drain the engine cooling system.
4. Disconnect the pressure relief vent hose.
5. CAUTION: Do not reuse the copper washers; reuse may cause reduced sealing effectiveness and natural gas leaks.
NOTE:
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Use only new natural gas approved O-ring seals upon installation.
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Lubricate the O-ring seals with Super Premium SAE 5W30 Motor Oil or equivalent meeting Ford specification WSS-M2C153-G.
