Warning: Before you begin, read the warning in paragraph 1 this chapter.
Checking the fuel pump
1. Turn on the ignition and listen to the fuel pump (the noise of the electric motor rotating can be heard from under the rear seats). Provided there is enough fuel in the tank, the pump should turn on for one or two seconds and then stop each time the ignition is turned on.
Note: If the pump runs all the time the ignition is on, the ECU is operating in the "drive home" mode according to Ford's limited functionality algorithm. This is almost certainly due to a fault in the ECU itself, and the vehicle should be taken to a dealer to have the entire system checked with diagnostic equipment. Do not attempt to check the system yourself in this case.
2. Listen for the noise of fuel draining from the pressure regulator. You can also feel the fuel pulsating in the regulator and the delivery hose from the fuel filter. If the pump does not turn at all, check the fuse, relay, and wiring (Chapter 12).
Checking fuel pressure
3. This operation requires a fuel pressure gauge with an adapter for the Schrader valve. This valve is installed on the fitting designed to control/relieve fuel pressure in the line. The valve can be identified by its blue plastic cover. If you have the Ford 29-033 (see paragraph 2), it can be connected to a valve, as well as to a conventional pressure gauge.
4. If you are using a regulated attachment, turn its valve counterclockwise until it stops, and then connect the attachment to the valve. Connect the pressure gauge to the attachment. If you are using a fuel pressure gauge with its own adapter, connect it according to the manufacturer's instructions (see Fig. 7.4).
5. Start the engine and let it idle. Read the pressure gauge reading as soon as the pressure is established. Compare the reading with the specified (see Technical data).
- a) If the pressure is too high, check if the drain line is clogged. If it is normal, replace the fuel pressure regulator.
- b) If the pressure is below the specified value, pinch the fuel drain line. If the pressure increases after this, replace the fuel pressure regulator. If the pressure does not increase, check the delivery line, fuel pump and fuel filter.
6. Disconnect the vacuum hose from the fuel pressure regulator. The pressure gauge reading should increase. Record the pressure increase and compare it with the specified pressure in the Technical Requirements. If it does not correspond to the specified pressure, check the vacuum hose and the pressure regulator.
7. Connect the vacuum hose to the regulator and turn off the engine. Make sure that the fuel pressure remains at the specified level for five minutes after the engine is turned off.
8. Carefully disconnect the fuel pressure gauge. Before disconnecting, cover the disconnected elements with a rag. Eliminate fuel leaks.
9. Start the engine and check for leaks.
(The original can be found on the specified resource: www.FordBook.ru)