Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSBMW2013128I 2D CONVERTIBLE, ENG CD N52, STANDARD TRANSREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 70 (ENGINE CONTROLS - BASIC DIAGNOSTIC PROCEDURES)FUEL SYSTEMFUEL PRESSURE TESTGENERAL INFORMATION
2013 BMW 128i 2D Convertible, Eng CD N52, Standard Trans
General Information
2013 BMW 128i 2D Convertible, Eng CD N52, Standard TransSECTION General Information
WARNING: This page does not describe the selected car, but rather 35 other vehicles, including the 2003 BMW Z8, 2003 BMW Z4, 2003 BMW X5, 2003 BMW M5, and 2003 BMW M3. However, it is still accessible from the selected car via links, so may be relevant.
- The connection for the vacuum hose of the fuel pressure regulator is located between the throttle and the air cleaner or on the air cleaner. As a test precondition, ensure the correct fuel pressure regulator is fitted. Using the Pressure Testing Kit (135220), check whether the fuel pressure regulator suitable for the car is installed. See FUEL VOLUME & PRESSURE .
- The control function of the fuel pressure regulator must be guaranteed under all operating conditions. The fuel pump must always be able to generate a higher fuel pressure than the pressure regulated by the pressure regulator. The injection rate is adjusted by means of the injection time; the injection time is controlled by the Digital Motor Electronics (DME) control module.
- When the engine is at a standstill and the ignition key is in off position, the fuel return line after the pressure regulator is at zero pressure.
- The pressure regulator closes when the engine is at a standstill and the ignition key is in off position. The fuel pressure in the delivery line is retained over an extended period. A non-return valve closes in the fuel pump. These measures help to retain the fuel pressure in the fuel system. Extended starting times are thus avoided.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.