Air in my fuel, Doh!

i had the same problem but mine was the complete setup, filer and mounting bracket. Did away with the Nissan setup. I traced it back to the screw in fittings where the hose joins on.

I've had a CAV fitted to every diesel I've owned, usually in front of (upstream) of the original filter. A lot of the smaller vehicles with rotary injection pumps won't handle the additional filter but Cruisers and Patrols do.
Toyota actually fitted a very similar second filter to the later 70 series.
While I've never had any probs with my vehicles I did help a mate who had probs with his and it too was the hose fittings into the top.
If you are using banjo type fittings the copper washers work harden and may not seal when refitted. They must be either replaced or re tempered by heating them to a red colour and allowing to cool.
They are then softer again and will seal when refitted.
This should also be done to vehicles with copper sump plug washers when changing the oil.
I used to always remove the whole CAV filter unit to disassemble on the bench. Replace the O rings when reassembling.

Thanks Peter and Chips.

I'll have another look at it today, Hadnt considered the hoses.

Cheers

Rev

I fixed it!

After removing it and dismantling, I found the only place the bubbles in the bowl could originate from were two seals at the bottom

one held the glass bowl on itself

and the other was the bottom bleed screw to remove crap and water.

well..a trick for young players (which unlike many on this forum I can count myself among lol) i had overtightened the seal that held the bowl on.

tho it was only hand tight it was putting the o-ring slightly out of skew.

runs like a charm.

Cheers
Rev

yes but with a lister generator running lucas filter. I ended up fully tightening every furl pipe union I could find . DO NOT overtighten the glass bowl to the filter it WILL crack