Used BMW 3 Series Fuel Injection Pump

No — the E46 (1998–2005) and E90 (2005–2013, facelift 2008) are entirely different generations with different engines, fuel systems, and management electronics, so the pumps are not interchangeable. Fitment follows the engine code above everything else, and these generations used distinct engine families. Always confirm the exact engine code from your V5 or a VIN check before ordering.

The E90 generation runs from 2005 to 2013 with a facelift in 2008, and for many engine codes the injection pump carried over unchanged across that boundary — but ancillary mounting and fuel system detail changes did occur mid-production on some variants. Give the breaker your full engine code and registration so they can confirm whether the pump from a pre- or post-facelift car is a direct swap for yours, rather than assuming generation alone is enough.

Both badges can share the same engine family within a generation — for example, certain N47 or M47 units were used across both in the E90 range — but the engine code is what actually determines fitment, not the badge on the boot lid. Pull your engine code from the V5 or a VIN decoder and match it to the donor car's code; if they match, fitment is far more likely to be correct. Confirm with the breaker before purchasing, as fuelling calibration and pump specification can vary even within the same engine family.

No, trim level makes no difference to fuel injection pump fitment — SE, M Sport, Sport, and Luxury are cosmetic and suspension packages, not mechanical ones. The pump is determined entirely by the engine code and fuel type (diesel or petrol), so a pump from an SE with the same engine code as your M Sport is mechanically equivalent. You may find cosmetic differences in the engine bay on an M Sport donor car, but that has no bearing on whether the pump itself will fit.

Within the E46 generation (1998–2005) fitment depends on the engine code, and the 318i and 320i used different petrol engine units — the 318i ran the N42 or M43 family while the 320i used the M54 or N46, so they are not interchangeable. Match the engine code stamped on your block (or from your V5) to the donor car's code before agreeing a price with the breaker. If the codes match, compatibility is much more likely, though ECU pairing and immobiliser coding should be confirmed with the breaker against your registration.

This is something you must confirm with the breaker against your exact registration, as ECU pairing and immobiliser coding requirements vary by engine management system and year. Some pumps are a straight mechanical swap with no coding needed, while others on more modern management systems may require dealer or specialist programming. A good breaker who supplies this engine code regularly will be able to advise before you buy.