13 31 029 Checking fuel pump delivery pressure (M54)

WARNING: This page is about a different car, the 2002 BMW Z3 and 2001 BMW Z3. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: For Special Tool identification, see SPECIAL TOOLS - Z3 (M54) .

Special Tools Required:

13 3 010
13 5 220
61 3 050

Switch off ignition.

CAUTION: The fuel in the fuel lines is under pressure (approx. 3 bar)! Catch and dispose of escaping fuel.

Remove cover from fuel injectors. Refer to FUEL RAIL & INJECTORS .

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

Fig 1: Removing Dust Cap From Measuring Valve

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

Fig 2: Identifying Special Tool Kit 13 5 220

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

Fig 3: Installing Special Tool Kit 13 5 220

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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.

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.

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. Test pressure/nominal value: bar +/- 0.2-3.5.

Switch off engine.

Checking Fuel Pump:

Detach fuel pump relay. Refer to13 63 590 REPLACING FUEL PUMP RELAY (Z3 / M54) .

NOTE: Check whether fuel pump no longer starts up during engine starting procedure (engine fails to start).

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

Fig 4: Connecting Bypass Switch To Terminals

Courtesy of BMW OF NORTH AMERICA, INC.

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

Compare actual Value With specified value of delivery pressure.

Keep special tool 13 3 010 ready for further tests.

Fig 5: View Of Hose Clip 13 3 010

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Further tests are described in 13 31 ... NOTES ON FUEL PRESSURE CHECK (REFERENCE PRESSURE: ENVIRONMENT) .

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