Potential fuel pump issue

[Barringer]

I recently purchased a 2018 X5 with 82,000 miles. One week after the acquisition, it failed to start. The AA was summoned and suggested a potential fuel pump issue. It was returned to the garage from where I got it (not BMW), and it has now been with them for four days without a definitive diagnosis. I believe that mileage is insufficient for a fuel pump issue. Has anyone encountered a similar experience? Are there any potential aftereffects or issues associated with replacing a gasoline pump, should that be the underlying problem?
Any assistance or information would be appreciated.

[MamaKiddo]

Which type of gasoline pump is required, low pressure or high pressure? I would be apprehensive if the pressure is elevated, as it might introduce metal particles into the fuel system, necessitating extensive repairs to replace the entire fuel system, since garages typically prefer not to clean pipes and tanks. Injectors would be ineffective.

If the low-pressure pump is not functioning, it is not a significant problem to procure and replace the karts.

[Barringer]

I am uncertain; the individual from AA indicated that the rear pump was functioning OK, but suggested that the front pump might be the potential problem. I communicated with the dealership from whence I acquired it (Ford), as it was traded in. They indicated that they are expecting wire maps from BMW, the significance of which is unclear. Which gasoline pump operates at low pressure and which operates at high pressure? This is entirely unfamiliar to me.

[MamaKiddo]

The low-pressure pump is an electronic device located in the tank, responsible for transferring fuel to the mechanical high-pressure pump affixed to the engine.
It appears they are awaiting circuit diagrams. I lack confidence in a Ford dealer's ability to accurately diagnose the issue, as I question their possession of diagnostic equipment sufficient for a comprehensive analysis of a BMW.

[Barringer]

Thank you for your clarification. I may insist on having it delivered to my local BMW store to resolve the issue and observe the outcome. Thank you one more.

[Strongspoi]

I would simply request a refund and purchase a functional one, as Johnny has shown that these can be problematic if swarf has reached the injectors.

[Barringer]

I communicated with them today; they indicated that they are replacing the entire fuel system. I have demanded documentation verifying the components installed and confirming that they are authentic BMW parts, as well as an extended warranty; otherwise, they may retain the vehicle.