The meter units may be leaking at the manifold, but it's pretty hard to tell. They are passing oil at a respectable rate, at least the ones I could see. I did have to change one from a 00 to a 0, today, on the gearbox system. There are 2 lines that go into the "bowl", one oils a bearing and the other is for the gears. I could see some tell tale traces from the bearing, but wasn't getting anything out of the gear tube. That unit got changed, and things are better. I was able to get the suction end of the pump covered without totally filling the gearbox.
The Bijur meter unit has a radiused end on the inout, that I think acts as the compression seal, the "Trico's" don't and I think that may be the cause of the leakage problem. I think an easier solution to that leakage problem would be to put some pipe dope on the threads.
I think I've got seal a problem on the pump on top of the piston. IIRC, there is a very small O ring in there. I may investigate later.