BMW 8 Series Fuel Tank Replacement Parts

The current BMW 8 Series (G14 convertible, G15 coupé, G16 Gran Coupé) launched in 2018, and within that generation fuel tank fitment is primarily driven by engine code and fuel type rather than the exact model year. If you are crossing into a different production year within the G15/G16 generation, confirm with the breaker whether any mounting bracket or ancillary changes were made mid-run against your specific registration, as these can vary. Supplying your engine code from your V5 or a VIN check gives the breaker the most reliable basis for matching the part.

Both years fall within the same G15/G16 generation (2018 onwards), so the engine code and fuel type are the primary fitment factors rather than the model year alone. That said, minor ancillary or mounting changes can occur mid-production without a formal facelift, so you should confirm directly with the breaker against your registration plate before purchasing. Sharing your exact engine code gives the breaker the best chance of finding a confirmed match.

Trim level does not affect fuel tank fitment; what matters is the engine code, fuel type, and gearbox type, not whether the car is badged 840i, 840d, M850i, or M8. The M8 uses a different engine (S58 or S63 depending on variant) to the 840i (B58 petrol) and 840d (B57 diesel), so the engine code will naturally differ and the breaker will match on that basis. Do not be put off or reassured by the trim name alone — always cross-reference the engine code from your V5 or a VIN check.

No, diesel and petrol fuel tanks are not interchangeable; they are engineered differently for the respective fuel systems and the filler neck geometry often differs. Always make sure the replacement tank matches your fuel type exactly, which you can confirm from the fuel type listed on your V5 or by a VIN check. Your breaker will need to know whether your car is a diesel (840d) or petrol (840i, M850i, M8) before sourcing the correct unit.

Gearbox type can affect fuel tank shape or mounting in some BMWs because the tank is designed around the drivetrain tunnel, so it is worth mentioning your gearbox to the breaker. Supplying your full engine code alongside the gearbox type gives the breaker the clearest picture for a confident match. Never assume a tank will fit solely because the badge or body style looks the same — confirm against your registration.

No — the original BMW 8 Series (E31) ran from 1989 to 1999, and the modern 8 Series (G14/G15/G16) launched in 2018; these are entirely separate generations with no parts interchangeability on structural or mechanical components like the fuel tank. The two cars share nothing in terms of platform, dimensions, or fuel system architecture. You will need to source a tank specific to your generation, confirmed against your engine code and registration.