Contents: Examination ↳ Fuel pressure control ↳
Examination
Turn on the ignition and listen to the fuel pump (you should be able to hear the sound of the electric motor running from under the rear seat). Each time you turn on the ignition, the pump should turn on for 1-2 seconds. If the pump turns on and works constantly, then the ECU unit may be faulty and the car should be taken to a service station for a complete check of the fuel system.
Check the operation of the fuel pressure regulator, which is determined by the fuel pulsations in the regulator and the supply hose from the fuel filter.
If the pump does not work, check the fuse, relay and wiring. Also check that the fuel pump circuit breaker is on.
Fuel pressure control
A pressure gauge must be used that connects to the fuel line between the fuel filter and the fuel rail. On Zetec and Zetec-E engines, a pressure gauge with an adapter must be used so that it can be connected to the valve on the fuel line (covered with a blue plastic head and located at the junction of the fuel feed pipe and the fuel line). If you have the special FORD 29-033 tool, a regular pressure gauge can be used.
When using the special tool, make sure that the plug is turned counterclockwise until it stops. Connect the pressure gauge valve according to the manufacturer's instructions (see Fig. 4D.10).
Start the engine. After the pressure in the fuel system has stabilized, read the pressure gauge and compare it with the required values:
- if the pressure is higher than normal, check the capacity of the return fuel line. If the fuel line is normal, replace the fuel pressure regulator.
- if the pressure is below normal, check the condition of the fuel supply hose, fuel pump and fuel filter.
Disconnect the vacuum hose from the pressure regulator. The pressure shown by the gauge should increase. If the pressure does not increase, check the condition of the vacuum hose and the fuel pressure regulator.
Reconnect the vacuum hose to the regulator and turn off the engine. Check the fuel system pressure 5 minutes after turning off the engine. Disconnect the fuel pressure gauge from the line. Start the engine and check the fuel system for leaks.
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