Residual Pressure, Checking

Diagnostic Procedures

Residual Pressure, Checking

Special tools, testers and auxiliary items required

• Switched remote control (jumper).

• Multimeter.

• Electrical connector test lead set.

• Fuel pressure gauge.

Test procedure

- Observe safety precautions. Refer to => [ Safety Precautions ] Safety Precautions

- Observe Clean Working Conditions. Refer to => [ Clean Working Conditions ] Clean Working Conditions

- Perform a preliminary check to verify the customers complaint. Refer to => [ Preliminary Check ] Preliminary Check.

Test conditions

• The pressure gauge remains connected from Fuel Pressure test.

• Fuel pressure of approx. 5.6 bar should be displayed on pressure tester.

• Hand held remote starter (jumper) is connected.

Test sequence

- Watch pressure drop on gauge. After 10 minutes pressure must not drop below a 4.0 bar decrease.

If pressure drops below 4.0 bar:

- Operate hand held remote starter (jumper) while doing this, observe display of pressure tester.

Fuel pressure must increase up to a maximum pressure of 6 bar.

- Release control button of hand held remote starter (jumper) and immediately close shut off valve of pressure gauge. Then lever the points perpendicular to flow direction - arrow -.





• When releasing control button of hand held remote starter (jumper), fuel pressure decreases to approx. 5.6 bar.

If pressure drops below 4.0 bar again:

(Leak on fuel tank side)

- Check connections to fuel tank for leaks.

If no malfunction can be found:

- Check fuel filter for leaks.

- Check fuel line to flange assembly for leaks.

- Check all additional fuel lines in fuel tank for leaks.

If no malfunctions are found on fuel line:

- Pressure relief valve in flange assembly faulty.

- Replace flange assembly which contains the pressure relief valve.