X5 50i no fuel priming sound?

[Furbz]

Hi all,

My 2016 X5 50i has 160000km on the clock.
I’ve recently replaced all the plugs and coils after a drivetrain error when going up a hill with the car fairly heavy.

Over the last few months car every now and then takes a little longer to start up than usual, sometimes when cold otherness when the start stop function is used often(ie in traffic)
I have also noticed the usual fuel priming noise that usually happens when I unlock the car no longer happens.
The car runs perfectly and I have not otherwise noticed any performance issues.
But it does bug me that the normal priming noise is missing.

Is this something I should be concerned about?