13 31 029 Checking fuel pump delivery pressure (S62)

NOTE:

For Special Tool identification, see SPECIAL TOOLS - M5 .

Special Tools Required:

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

Switch off ignition.

Remove rear underbody protection from assemblies.

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

E39 Only:

Release screw connections (1).

Fig 1: Releasing Screw Connections On Cover

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Press cover (2) downwards on left side of floor plate.

E39 And E52:

Remove dust cap (1).

Fig 2: Removing 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 3: Identifying 13 5 220 Adapter

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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 4: Attaching Adapter To Housing Of Pressure Regulator

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Measuring fuel pressure.

Select Measurement.
Multimeter function appears.
Select Pressure test.
Read off pressure.

Compare with test pressure. 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.

Fig 5: Checking Pump Delivery Pressure

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Fuel pump delivery pressure. Refer to FUEL PUMP .

NOTE: For further test procedures, refer to 13 31 ... NOTES ON FUEL PRESSURE CHECK (REFERENCE PRESSURE: INTAKE MANIFOLD PRESSURE .

NOTE: 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 module. Check stored fault messages. Rectify faults. Then clear fault memory.