You may already know about these Startline Al, but a company that ive used previously for crank case breathers, air filters are "inline filters", see link. Just enter volvo part number for equivalents.
No connection, just satisfied customer.
Thanks, not used them before.
The filters were mainly just dirty and I've no idea how long since they were changed, I'm now keeping a record in the log book to keep track.
All fuel filters were changed and the fuel from both tanks was run through a 5 micron filter before we bought the boat, so gradually getting to grips with the maintenance