13 31 029 Checking Fuel Pump Delivery Pressure (S54)

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NOTE:

For Special Tool identification, see FUEL SYSTEM - SPECIAL TOOLS - 3-SERIES (M54/E46) .

Special Tools Required:

13 5 220
13 5 221
13 5 222
61 3 050

Switch off ignition.

CAUTION: The fuel in the fuel lines is under pressure (approx. 5 bar)! Catch and dispose of escaping fuel.

Release screw connections (1).

Remove cover (2) on floor plate on left.

Fig 1: Locating Screw Connections On Floor Plate Cover

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Installation:

Ensure seal (1) is in correct installation position.

Fig 2: View Of Seal In Correct Position

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Remove dust cap (1).

Fig 3: Identifying Dust Cap

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Connect special tool kit 13 5 220 (comprising 13 5 221 and 13 5 222) to pressure sensor of DIS Tester.

Connect pressure sensor to DIS Tester.

Fig 4: Connecting Pressure Sensor To DIS Tester

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CAUTION: 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.

Attach special tool kit 13 5 220 to housing of pressure regulator and tighten knurled nut until hand-tight.

Screw out check valve (1) so that valve in pressure regulator housing is closed.

Start engine.

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

Fig 5: Attaching Adapter To Housing Of Pressure Regulator

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Measuring fuel pressure.

Select Measurement.
Multimeter function appears.
Select Pressure test.
Read off value of fuel pressure.

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

Switch off engine.

Checking Fuel Pump:

Remove fuel pump relay. Refer to 13 63 590 REPLACING FUEL PUMP RELAY .

Connect special tool 61 3 050 to terminals 87 and 30.

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

Compare actual value with setpoint value of delivery pressure. Refer to FUEL SYSTEM - TECHNICAL DATA

Fig 6: Locating Terminals 87 And 30

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NOTE: For further test procedures, refer to 13 31 ... NOTES ON FUEL PRESSURE CHECK (REFERENCE PRESSURE: INTAKE MANIFOLD PRESSURE) . Removing special tool kit 13 5 220:

Switch off engine.
Screw out check valve fully again.
Remove special tool kit 13 5 220 from pressure regulator housing.
Catch and dispose of escaping fuel.

NOTE: Interrogate fault memory of DME control unit. Check stored fault messages. Rectify faults. Then clear fault memory.