13 31 029 Checking fuel pump delivery pressure (M54)

Special tools required: 

• 13 3 010
• 13 5 220
• 61 3 050

Switch off ignition.

Catch and dispose of escaping fuel.

Remove cover from fuel injectors.

Remove dust cap (1) from measuring valve on fuel rail.

Fig 1: Removing Dust Cap From Measuring Valve On Fuel Rail

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Prepare special took kit 13 5 220 (consisting of 13 5 221 and 13 5 222).

Fig 2: Assembling Special Took Kit

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Unscrew check valve (1) on special tool kit 13 5 220.

Fit special tool kit 13 5 220 on measuring valve and tighten knurled nut until hand-tight.

Start engine.

Screw in check valve (1) until a pressure reading is indicated on DIS Tester.

Fig 3: Connecting Special Tool Kit On Measuring Valve

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Measuring fuel pressure: 

• Connect pressure sensor to DIS Tester
• Start engine.
• Select Measurement.
• Multimeter function appears
• Select Pressure test
• Read off fuel pressure

Compare actual value of test pressure with specified value.  See FUEL SYSTEM - TECHNICAL DATA .

Switch off engine.

Checking fuel pump: 

Detach fuel pump relay.  See RELAYS .

Connect special tool 61 3 050 to terminal (87) and terminal (30).

Press button and read off fuel pump delivery pressure on DIS Tester.

Compare actual value with specified value of delivery pressure.

Fig 4: Connecting Special Tool To Terminal 87 And 30

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Keep special tool 13 3 010 ready for further tests.

Further tests are described in 13 31... Notes On Fuel Pressure Check (Reference Pressure: Environment) 

Fig 5: Installing Special Tool

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Check stored fault messages.

Rectify faults.

Then clear fault memory.