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.
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Fig. 9: Identifying Circlip, Fuel Line And Fuel Tank
Unscrew adapter (1) from special tool 13 5 270.
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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.
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Fig. 11: Identifying Pressure Sensor And Special Tools 11 4 310 And 13 5 270
Assemble engine.
Check fuel system for tightness.
READ NEXT:
Notes Regarding The Fuel Pressure Test (Reference Pressure:
Surrounding Area)
The characteristic of this version with ambient pressure:
The connection for the vacuum hose of the fuel pressure regulator is located
between the throttle and the air
cleaner or on the air cleaner.
Removing And Installing/Replacing All Pressure Lines (N63)
Notes
WARNING: Electric fuel pump starts up automatically when door is
opened!
Disconnect BATTERY NEGATIVE TERMINAL (risk of fire due to shortcircuiting
on removal).
Observe warning on cylinder head
SEE MORE:
Removing And Installing Or Replacing Junction Box Electronics
IMPORTANT: Read and comply with notes on protection against electrostatic
discharge (ESD
PROTECTION).
Necessary preliminary work
Partially remove power distribution box for passenger compartment.
Disconnect plug connection (1).
Pull junction box electronics (2) out of bracket.
Installation not
Risk Of Injury If Oil Comes Into Contact With Eyes And Skin
Danger of injury!
Contact with eyes or skin may result in injury!
Possible symptoms are:
Impaired sight
Irritation of the eyes
Reddening of the skin
Rough and cracked skin
Protective measures/rules of conduct
Wear safety goggles
Wear oil-resistant protective gloves
Observe country-specific
