Bleeding air from the low pressure circuit of the fuel system of the 612 series engine
1 - Fuel return line fitting; 2 - Ventilation hose; 3 - Ventilation pump
1. Illustrative material on performing the procedure for bleeding air from the low-pressure circuit of the fuel line of the 612 series engine is presented in the illustration, to which all references in the text refer.
2. Remove the cylinder head trim panels.
3. Disconnect the fuel return line from the fitting (1).
4. Connect the ventilation hose (2) to the released fitting (1).
Information copied from the website [MERCEDESMAN.ru]
5. Connect the ventilation pump (3) to the cigarette lighter socket.
6. Continue the ventilation procedure until the fuel in the exhaust stream stops bubbling.
7. Disconnect the pump (3) and restore the original connection of the communication lines.
8. Installation of removed components is carried out in the reverse order of their dismantling.