Function of the injection system: - ra07066020010x(0010)

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F. Fuel pump (3) Engines 602. 96, 603.96/97 TURBO (Model 463.3: pay attention to deviations)

F. Fuel pump (3)

As a result of the high delivery of the fuel pump, the fuel system is self-bleeding, which makes it possible to eliminate the hand priming pump.

Delivery > 150 cm³ /30 s, at starting speed > 150/min, measured in fuel return line.

Fig 1: Identifying Fuel Pump Components

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Fig 2: Identifying Fuel Pump Pressure And Suction Port

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

A restriction in the bypass valve at the injection pump is required for bleeding the injection pump.

Bypass valve with restriction dia. 1.5 mm (arrow).

The bypass valve prevents unfiltered fuel flowing along the return line into the injection pump if the inlet line is clogged (e. g. filter).

Fig 3: Identifying Bypass Valve With Restriction

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Restriction with bypass valve

Fig 4: Identifying Restriction With Bypass Valve Components

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.