I have wrapped the filter housing with an old towel. Checked it at each stop and this morning the towel was just damp but oily(deisel)so we willpersevere for the moment and at the first garage with any ffacilities try to tighten it up. I.m a bit reluctant to dismantle it unless I have at least a new o ring available. It may be that the existing ring has deteriorated and may not reseat and leak more if disturbed.
We are currently at the Tonge causeway , sunny again but cooler with a slght breeze. Some snow on the mountain tops in the distance