Auxiliary Fuel Pump Delivery Quantity, Checking, Through May 2010

Auxiliary Fuel Pump Delivery Quantity, Checking, through May 2010

Special tools, testers and auxiliary items required

• Vehicle Diagnosis Tester

• Hose with 8 mm inner diameter, fuel resistant

• Measuring container, fuel-resistant

Procedure

• The transfer fuel pump (G6) delivery rate is OK. Refer to => [ Fuel Delivery Volume from the Transfer Fuel Pump (G6) in the Fuel Tank, Checking, with Vertical Fuel Filter ] Fuel Delivery Volume From the Transfer Fuel Pump (G6) In the Fuel Tank, Checking, With Vertical Fuel Filter, Vehicles with a reducing agent metering system, refer to => [ Transfer Fuel Pump (G6) Delivery Rate, Checking ] Transfer Fuel Pump (G6) Delivery Rate, Checking.

Observe test conditions. Refer to => [ Test Conditions ] Initial Inspection and Diagnostic Overview.

Follow the guidelines for cleanliness. Refer to => [ Clean Working Conditions ] Fuel Supply System.

- Carefully pull the engine cover off the 4 bolts one after the other - arrows -.






Very hot fuel can burn skin.

• In extreme cases, the fuel lines and the fuel itself in vehicles with a common rail engine can be as hot as 100 °C (212 °F) after the engine has been turned off. Let the fuel cool down before opening any line connections otherwise there is a danger of scalding.

• Wear protective gloves.

• Wear safety glasses.

There is a risk of injury because the fuel is under pressure.

• To reduce pressure in the fuel system, lay a clean cloth around the connector and carefully loosen connector.

- Disconnect the fuel supply hose - 1 -.






• Ignore - 2 -.

- Connect the fuel resistant hose to the fuel supply line - arrow - and hold it inside a fuel resistant container.






- Connect the vehicle diagnosis tester and turn on the ignition.

There are various procedures, depending on the engine version.

Version 1






- Press the Start button and press the Stop button after 15 seconds.

Version 2






- Activate the button - 1 -, press it and after 15 seconds, press the arrow key - 2 -.






Both Versions

- Check the amount of fuel in the measuring container.

• Specified value: About 1 liter at minimum 12.5 V battery voltage.

If minimum delivery quantity is not obtained, the following malfunctions may be present:

• Fuel lines pinched.

• Fuel filter clogged.

• Fuel pump faulty.

Assemble in reverse order of disassembling. Note the following:

• Secure all hose connections with the hose clamps of the same type as those equipped by the factory. Refer to the Parts Catalog.