13 31 029 Check fuel delivery pressure (N51, N52, N52K)

WARNING: This page is about a different variant/trim than selected.

Special tools required:

13 5 220
13 5 221
13 5 222
11 4 310

IMPORTANT:

The fuel in the fuel lines is under pressure.

Catch and dispose of escaping fuel.

Necessary preliminary tasks:

Switch off ignition.
Remove acoustic cover.

Fig 1: Locating Acoustic Cover Screws

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Unclip connector (1) from bracket (2). Unclip bracket (2) from fuel injection pipe.

Fig 2: Identifying Plug Connection And Holder

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Remove dust cap (1).

Fig 3: Identifying Dust Cap

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

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IMPORTANT: Do not under any circumstances screw in the check valve up to the mechanical stop.

This could damage the valve in the 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 5: Check Valve And Special Tool Kit (13 5 220)

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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 6: Identifying Special Tool

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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 7: Installing Special Tools

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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.