13 31 029 Checking fuel delivery pressure (N52T)

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Special tools required:

IMPORTANT: Fuel in fuel lines is under pressure (approx. 5 bar).
Catch and dispose of escaping fuel.

Necessary preliminary tasks:

Switch off ignition.
Remove ACOUSTIC COVER

Remove dust cap.

Fig 1: Locating Dust Cap

Courtesy of BMW OF NORTH AMERICA, INC.

Procedure with the 25 bar pressure sensor:

Connect the set of special tools 13 5 220 (consisting of 13 5 221 and 13 5 222 ) to the pressure sensor of the BMW diagnosis system.

Connect pressure sensor to the BMW diagnosis system or IMIB.

Fig 2: Identifying Special Tools (13 5 221 And 13 5 222)

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: Do not screw in shutoff valve up to mechanical limit position under any circumstances.
This could damage the valve in pressure regulator housing.

Install set of special tools 13 5 220 at injection pipe and tighten knurled nut hand-tight.

Unscrew shutoff valve (1) so that valve in pressure regulator housing is closed.

Establish fuel delivery pressure.

Screw in shutoff valve (1) until a pressure reading is displayed on BMW diagnosis system or IMIB. Read off fuel delivery pressure and compare with values in BMW diagnosis system.

Fig 3: Installing Special Tools (13 5 220) To Injection Pipe

Courtesy of BMW OF NORTH AMERICA, INC.

Procedure with the 100 bar IMIB pressure sensor:

For the check of fuel delivery pressure with the 100 bar IMIB pressure sensor only tool 13 5 221 is needed from the set of special tools. Unscrew special tool 13 5 222 from special tool 13 5 221 .

Fig 4: Identifying Special Tools (13 5 221 And 13 5 222)

Courtesy of BMW OF NORTH AMERICA, INC.

Install special tool 13 5 221 at fuel injection pipe and tighten knurled nut hand-tight.

Unscrew shutoff valve so that valve in pressure regulator housing is closed.

Screw onto special tool 13 5 221 , the special tool 11 4 310 .

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

Establish fuel delivery pressure.

Screw in shutoff valve until a pressure reading is displayed on IMIB. Read off fuel delivery pressure and compare with values in BMW diagnosis system.

Fig 5: Installing Special Tool (13 5 221) To Fuel Injection Pipe

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: Removal of the set of special tools 13 5 220 :

Stop engine.
Fully unscrew shutoff valve
Remove set of special tools 13 5 220 from pressure regulator housing
Catch and dispose of escaping fuel

NOTE: Read out the fault memory of the DME control unit.
Check stored fault messages.
Delete fault memory.