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.
2021 BMW M3 Base, Standard TransFACTORY OEM SERVICE PROCEDURE
Fuel System -- Tightening Torques M3 (G80)
Select a section or procedure below to view factory instructions:
13 31 FUEL PUMP, FUEL LINES (M3 base, M3 Competition, M3 Competition M xDrive, M3 CS)13 51 FUEL DELIVERY LINE TO FUEL INJECTION PUMP (M3 base, M3 Competition, M3 Competition M xDrive, M3 CS)13 53 FUEL INJECTORS, FUEL INJECTION PUMP, FUEL PRESSURE SENSOR (M3 base, M3 Competition, M3 Competition M xDrive, M3 CS)13 54 THROTTLE BODY (M3 base, M3 Competition, M3 Competition M xDrive, M3 CS)13 62 ENGINE SENSORS (M3 base, M3 Competition, M3 Competition M xDrive, M3 CS)13 71 INTAKE SILENCER, INTAKE AIR DUCT (M3 base, M3 Competition, M3 Competition M xDrive, M3 CS)13 72 ENGINE AIR FILTER HOUSING (M3 base, M3 Competition, M3 Competition M xDrive, M3 CS)
Factory Service Tools
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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.