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Well, I imagine it comes out of the tank at low pressure and gets bumped up at the engine for the direct injection. If the tank pump failed, then it makes sense that there is no (or low) fuel at the hpfp to pressurize, causing too low pressure there. Since my code reader isn't BMW specific, it probably only provides basic information and rudimentary interpretation of BMW specific codes. For all I know, the actual BMW code may have corresponded to the low pressure pump but all my reader gets is something akin to "help! no fuel at the engine!"
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