Fuel system — fuel pressure (Discovery 1)

Check - Figure 5

Technical conditions

System pressure	System status	Meaning
In the system	The vacuum is disabled	2.39-2.67 bar
Residual pressure	In 60 seconds	less by 0.7 bar

Note: To prevent the engine from starting when cranking the engine, disconnect the injector connectors.

Make sure the ignition is off.

Remove the fuel pump relay.

Start the engine.

Wait until the engine stops.

Turn off the ignition.

Connect a pressure gauge between the fuel supply hose and the fuel filter.

Reinstall the fuel pump relay.

Turn on the ignition.

Disconnect the vacuum hose from the fuel pressure regulator.

Turn the engine over with the starter.

Compare the system pressure measurement results with the specifications.

Turn off the ignition.

Compare the residual pressure measurement results with the specifications.

Injectors

Fuel flame shape and tightness: Refer to the general inspection section.

Resistance Check - Figure 6

Technical conditions

Contacts	Resistance
1 and 2	16-17 Ohm

Make sure the ignition is off.



Disconnect the injector electrical connector.

Measure the resistance between the injector contacts.

Check all injectors.

Checking the supply voltage - Figure 7

Technical conditions

Contacts	Voltage
2 and mass	battery

Make sure the ignition is off.

Disconnect the injector electrical connector.

Turn on the ignition.

Measure the voltage between the wiring connector terminal and ground.

Check all injectors.

If the voltage does not meet the specifications, check the wiring.

(The original text can be found at LRMAN.RU)