It has a single fuel pump located in the fuel tank.
For context, the 2007 BMW 328i (E90) uses the N52 3.0-liter inline-six with port fuel injection, which relies on one in-tank electric pump to deliver fuel to the engine. There is no separate high-pressure pump in this configuration.
What the fuel-pump setup looks like in the 328i
The setup centers on a single in-tank pump module that supplies fuel to the engine through the rail, with a regulator controlling pressure and a return line cycling excess fuel back to the tank.
Engine context
In 2007, the 328i used the N52 engine with port fuel injection, which influences the fuel-pump design by keeping a single in-tank pump sufficient for fuel delivery.
- Single in-tank electric fuel pump inside the fuel pump module
- Fuel sending unit including the fuel level sensor
- In-tank fuel filter integrated into the module
- Electrical connectors and pump housing
- Fuel rail with a regulator and a return line to the tank
In this configuration, the pump pressurizes fuel to feed the rail, while the engine-side regulator maintains the proper pressure and returns excess fuel to the tank as needed.
Maintenance considerations
With a single tank pump, maintenance focuses on reliable electrical supply, filter cleanliness, and timely replacement if the pump fails or the sending unit becomes faulty.
- Pump failure can cause no-start or stalling
- Clogged or failing sending unit or filter can affect fuel flow
- Electrical harness and ground issues can trigger fault codes or poor pump performance
Regular checks during service and when symptoms appear can help prevent fuel delivery problems in this model.
Summary
The 2007 BMW 328i uses a single in-tank fuel pump to supply fuel for its port-injected N52 engine; there is no additional auxiliary pump in this configuration. The pump module, rail regulator, and return line work together to maintain consistent fuel delivery.