x5 with diesel pressure problem

Please help-
On starting vehicle at any time hot or cold there is a lot of engine turnover before engine starts,have been told their are 3 pumps on car 2 that lift to engine,1 that pushes through,and that 1 of these pumps have failed,the code on the machine was cleared but fault remains,has anyone incured this problem and what was the pump that failed also how much did it cost to repair ...Thanks for reading ..