BMW 7 Series: Checking Fuel Delivery Pressure (N20, N53, N54, N55, N63, N74)

Necessary preliminary work:

Connect BMW diagnosis system.

IMPORTANT: Lines are under pressure!

Wear protective goggles and gloves.

Fuel can emerge spontaneously at high velocity when the fuel line is released!

Recycling:

Catch and dispose of escaping fuel with auxiliary materials.

Observe country-specific waste disposal regulations.

NOTE: Remove circlip (1).

Unlock and detach fuel line (2) to fuel tank from fuel line (2) to high pressure pump.

Fig. 9: Identifying Circlip, Fuel Line And Fuel Tank

Unscrew adapter (1) from special tool 13 5 270.

Fig. 10: Identifying Adapter And Special Tool 13 5 270

Insert special tool 13 5 270 into disconnected fuel line.

Screw onto special tool 13 5 270, the special tool 11 4 310.

Screw IMIB 100 bar pressure sensor (1) on the special tool 11 4 310.

NOTE: As an alternative to the 100 bar IMIB pressure sensor (1), the 25 bar pressure sensor can also be used. For this, screw on special tool 11 5 364 instead of special tool 11 4 310 into special tool 13 5 270. Or directly screw the pressure manometer from the set of special tools 13 3 060 onto the special tool 13 5 270.

Establish fuel delivery pressure. Read off fuel delivery pressure on IMIB and compare with values in diagnosis system.

Fig. 11: Identifying Pressure Sensor And Special Tools 11 4 310 And 13 5 270

Assemble engine.

Check fuel system for tightness.

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