gday legends, so i’m chasing a very tiny airleak that i can hear on the back of my fuel pump when i hand prime the lifter on my td. everything is new, all rubber lines (including small one from spill rail to pump), copper washers, clamps etc. i’ve seen a couple of posts about diesel leaking from a little yellow cap? right above the banjo for the return line. what’s actually behind it in terms of a seal? as that’s the only thing i have not touched.

cheers everyone, hope all is well during these tough times in vic