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 159 (FUEL SYSTEM - REPAIR INSTRUCTIONS - X5 (4.4L))
2013 BMW 128i 2D Convertible, Eng CD N52, Standard Trans
Section 159 (Fuel System - Repair Instructions - X5 (4.4L))
2013 BMW 128i 2D Convertible, Eng CD N52, Standard TransSECTION Section 159 (Fuel System - Repair Instructions - X5 (4.4L))
WARNING: This page is about a different car, the 2003 BMW X5, 2002 BMW X5, 2001 BMW X5, and 2000 BMW X5. However, it is still accessible from the selected car via links, so may be relevant.
- Checking - Setting Engine
- Fuel Pump with Drive and Line
- 13 31 ... Notes on fuel pressure check (reference pressure: environment)
- Feature Of This Version With Ambient Pressure:
- Test Precondition:
- Description Of Operation:
- Description Of Operation: Fuel Return Line
- Description Of Operation: Pressure Retaining Function
- Complaint: Drive Characteristic Faults, Lack Of Power
- If The Measured Value Is Less Than The Nominal Value - 0.2 Bar:
- If The Measured Value Is Greater Than The Nominal Value + 0.2 Bar:
- Important:
- Complaint: Starting Problems
- If The Measured Value Has Dropped By More Than 0.5 Bar:
- If The Measured Value Has Now Dropped By Less Than 0.5 Bar, The Following Faults Can Be Present:
- If The Measured Value Has Dropped By More Than 0.5 Bar Again:
- 13 31 029 Checking delivery pressure of fuel pump (M62)
- 13 31 ... Notes on fuel pressure check (reference pressure: environment)
- Fuel Filter
- Injection Pump, Regulator, Mixture Regulator
- Injection Nozzle and Lines
- Throttle and Operation
- Sensor for Control Unit
- Throttle Potentiometer
- Start Valves
- Intake Silencer
- Air Cleaner
- Carbon Canister Ventilation
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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.