Fuel Line Evacuation
WARNING: This page is about a different car, the 2004 Ford RV Cutaway, 2004 Ford Econoline, 2004 Ford E450 Super Duty, and 2004 Ford Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
WARNING:
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.
WARNING:
The 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.
WARNING:
Do not modify the system configuration or components, or replace components with parts not specially designed for use with natural gas. Ford Motor Company has specially designed the materials, components and system configuration for the 5.4L Econoline natural gas vehicles, and each particular system is precisely calibrated for efficient operation. The use of different parts or materials can produce an untested configuration that could result in fire or personal injury, or cause engine damage.
WARNING:
Fuel line venting is required prior to fuel system component service.
WARNING:
Eye and ear protection are required to be worn during venting or removal and installation of fuel system components.
WARNING:
The status (stuck open, stuck closed, does not operate or good) of each fuel tank solenoid valve must be identified prior to venting the fuel tanks.
NOTE:
It is recommended that venting be performed with a vent stack. A typical vent stack installation is shown in DESCRIPTION AND OPERATION . This is a typical installation only. Any vent stack installation must be approved by local authorities.
NOTE:
The following procedures are required to be used when venting fuel from the fuel lines to remove the fuel tanks, the fuel lines, the coalescer/filter assembly, the fuel pressure regulator, the fuel injection supply manifold, the fuel injectors, the fuel Pressure Relief valve, the fuel shutoff valve solenoid, the injection pressure sensor or the engine fuel temperature sensor.
- Close each manual lock-down valve jackscrew on the fuel tank solenoid valves.
- Disconnect the fuel rail pressure (FRP) sensor electrical connector.
- Start the engine and allow it to idle until it stalls. Once the engine stalls, crank the engine for an additional 15 seconds.
- Slightly loosen the FRP sensor to release the residual pressure from the fuel rail.
- Tighten and reconnect the FRP sensor.
- Using the scan tool, access the FRP PID. The FRP PID should indicate less than 5 psi. If so, the fuel system may be opened and serviced. If not, repeat the procedure.
- Slightly loosen the low pressure fuel line fitting until the fuel starts to escape. After the fuel is evacuated, disconnect the fitting, install new O-rings, lubricate the O-rings with engine oil, and connect the fitting.
ALL VEHICLES
ENGINE RUNS
NOTE:
Running the engine with the FRP sensor electrical connector disconnected will generate a DTC that will have to be cleared.
WARNING:
This step in the procedure will vent a very slight amount of residual pressure to the atmosphere. Use care to prevent the combustion of escaping fuel. Smoking, open flames or any kind of arcing must be avoided. Carry out this operation only in a well-ventilated area. Failure to follow these instructions may result in personal injury.
NOTE:
If the vehicle is being serviced for an FRP sensor DTC, the FRP PID reading may not indicate actual pressure in the fuel rail.
ENGINE DOES NOT RUN
WARNING:
This step in the procedure will vent pressure to the atmosphere. Use care to prevent the combustion of escaping fuel. Smoking, open flames or any kind of arcing must be avoided. Carry out this operation only in a well-ventilated area. Failure to follow these instructions may result in personal injury.