13 31 029 Checking fuel pump delivery pressure (N52)

Special tools required:

13 5 220 .
13 5 221 .
13 5 222 . See FUEL SYSTEM - SPECIAL TOOLS .

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

Necessary preliminary tasks:

Switch off ignition.
Remove acoustic cover . See 11 00 REMOVING AND INSTALLING/REPLACING ACOUSTIC COVER (N52/N52K) .

Remove dust cap (1).

Fig 1: Locating Dust Cap

Courtesy of BMW OF NORTH AMERICA, INC.

Connect special tool kit 13 5 220 (comprising 13 5 221 and 13 5 222 ) to pressure sensor of DIS Tester. See FUEL SYSTEM - SPECIAL TOOLS

Connect pressure sensor to DIS Tester.

Fig 2: Identifying Special Tool 13 5 221 And 13 5 222

Courtesy of BMW OF NORTH AMERICA, INC.

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.

Mount special tool kit 13 5 220 to injection tube and tighten knurled nut 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 3: Identifying Check Valve And Special Tool Kit 13 5 220

Courtesy of BMW OF NORTH AMERICA, INC.

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.

Switch off engine.

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: Read out fault memory of DME control unit.
Check stored fault messages.
Now clear the fault memory.