Originally Posted by Kinzer S13GT
...BMW doesn't manufacture the HP fuel pumps. Siemens does. Besides, that would be an engine support device/electronics. It has nothing to do with the mechanical design of the engine. Nor to its reliability. The pumps are failing... not the engines.
Big difference. We can Make a reference to that, only when people start throwing rods through the sleeved blocks of their N54's!!! Or eating pistons, etc, etc...
Siemens made the pumps in the early days of the N54 engine. Subsequently, Siemens sold their VDO division to Continental and BMW used in the N54 pumps made by Bosch; currently, BMW uses the pump made by Continental. All three companies involved in manufacturing the pump know as much about making fuel pumps as BMW knows about making cars. The cars that fail due to fuel delivery usually experience problems with the pump, fuel injectors, etc., which seems to indicate that the problem is not limited to the pump, but rather it is due to the integration of the fuel delivery system. It appears that the components of the fuel system incur cumulative damage that in many cases culminates in the failure of the high pressure pump. There is no doubt that the N54 is an engine deserving praise for the originality of design and the performance it delivers. Reliability is different matter - it is more difficult to evaluate and less glamorous to write about.