[AllHailKingVolvo]

Yes I get a couple of seconds of fuel pump buzz when I turn the key. The underbody pump is noisy in general, it runs perfectly right down to the bottom of the reserve so I don't think the in-tank pump is faulty, but I suspect the underbody pump may be weak or the fuel filter partially blocked, causing the cavitation noise.

It's a really good shout to check the pressure at the rail, I have a pressure gauge so will ask my partner to crank it whilst I check the pressure, thanks for the tip!