Removing and installing fuel pumps - RA07041045750X (07.4-5750)

Operation No. of operation texts and operation values or standard texts and flat rates

Both fuel pumps

07-5750

Fuel pump 1

07-5713

Fuel pump 2

07-5714

1. Removing and installing fuel pump 1 (M3m1) 
   Fig 1: Identifying Fuel Pump 1 (M3m1) Components

   Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

   Pay attention to safety instructions!
   Overpressure in fuel tank	reduce by opening pressure cap, closing.
   Ground cable at battery	disconnect, connect.
   Cover (69)	take off, fit on. Installation position see 07.4-5770
   Fuel suction hose (53) and fuel pressure hose (52)	pinch with clamp (51) 000 589 40 37 00, slacken clamp.
   Cap nut (54a)	at fuel pump 1 (M3m1) unscrew, screw on. Collect remaining fuel. Tightening torque 26 Nm as reference value.
   Copper seals (62)	renew.
   Electric cables of fuel pump 1 (M3m1)	disconnect, connect. Pull off protective caps for this purpose, fit on. Installation instruction  Positive cable M4 connection thread. Negative cable M5 connection thread.
   Hose clip at fuel suction hose (53)	slacken, secure.
   Fuel suction hose (53)	press off, fit on.
   Screws (arrows)	at bracket (57) slacken, tighten. Detch fuel pressure hose (52) for this purpose, attach.
   Fuel pump (M3m1)	remove, insert with plastic sheet (56). Pay attention to spacer piece (65). Examine plastic sheet (56); renew if necessary. It is essential to insert plastic sheet (56) between fuel pump (M3m1) and bracket (57). The plastic sheets of the fuel pumps (M3m1, M3m2) and of the fuel filter (55) must project on both sides of the bracket. Direct contact of a fuel pump with the bracket results in contact corrosion.
   Leaktightness of all connections	examine with engine running.

   Special tool 

   Fig 2: Identifying Special Tool (000 589 40 37 00 00)

   Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
2. Removing and installing fuel pump 2 (M3m2) 
   Fig 3: Identifying Fuel Pump 2 (M3m2) Components

   Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

   Pay attention to safety instructions!
   Overpressure in fuel tank	reduce by opening pressure cap, closing.
   Ground cable at battery	disconnect, connect.
   Cover (69)	take off, fit on. Installation position see 07.4-5770
   Fuel suction hose (53) and fuel pressure hose (52)	pinch with clamp (51) 000 589 40 37 00, slacken clamp.
   Cap nut (54a)	unscrew at fuel pump 1 (M3m1), screw on. Collect remaining fuel.
   Cap nut (54b)	Tightening torque 26 Nm as reference value. unscrew at fuel pump 2 (M3m2), screw on. Collect remaining fuel. Tightening torque 9 Nm as reference value.
   Copper seals (62)	renew.
   Screws (arrows)	at bracket (57) slacken, tighten. Detach fuel pressure hose (52) for this purpose, attach.
   Electric cables at fuel pump 2 (M3m2)	disconnect, connect. Pull off protective caps for this purpose, fit on. Installation instruction  Positive cable M4 connection thread. Negative cable M5 connection thread.
   Fuel pump 2 (M3m2)	remove, insert with plastic sheet (56). Detach fuel line (61) from fuel pump 1 (M3m1) for this purpose, fit on. Pay attention to spacer piece (65). Examine plastic sheet (56); renew if necessary Always install plastic sheet (56) between fuel pump (M3m2) and bracket (57). The plastic sheets of the fuel pumps (M3m1, M3m2) and o the fuel filter (55) must project on both sides of the bracket. Direct contact of the fuel pump wit the bracket results in contact corrosion.
   Fuel line (61)	press off fuel pump 2 (M3m2), fit on.
   Leaktightness of all connections	examine with engine running.

   Special tool 

   Fig 4: Identifying Special Tool (000 589 40 37 00 00)

   Courtesy of MERCEDES-BENZ OF NORTH AMERICA.