That could work. I use the small Mopar 409 filters on my stuff these days. The little filters fill up with oil faster and they are stronger since they are smaller. Screw one of those on there and see if it solves the problem.

the dual swinging pick-ups have issues sometimes. I always used the static dragster pick-ups. that being said i'll be the odd man out here. try a different filter first before dismantling the mechanicals. I've had trouble with drain back on every wix, napa, k&n, and I hate to say but baldwins too. baldwins used to be top notch. the anti-drainback in the wix, etc, etc, doesn't work when the filter is in the horizontal. people will argue this but I doubt most people know or understand drain back. currently i'm using purolator pl30001's without issue. other brands may work too. a $10 test is where i'd go first.

Never had a problem with Wix oil filters. This just started with the Moroso oil filter.

the problems that the OP originally layed out are exactly problems I have experienced with filter drain back. the oil will drain out of the filter to the bottom of the threaded connection. that doesn't mean there "couldn't" be an air leak, but I seriously doubt that pressure would pick back up/normalize by mechanical priming if the system wasn't air tight. I've built milodon swinging pick-up engine combo's without issue, BUT the joint where the pick-up swings can leak air if not always covered in oil and that's why my preference is a static pick-up.

Just to mention, I do run a Moroso 3 quart accumulator. Even after turning it on and getting 24 psi out, the pump still won't prime.

Just to mention, I do run a Moroso 3 quart accumulator. Even after turning it on and getting 24 psi out, the pump still won't prime.

Andy, I have my 2qt Accumulator providing oil to the back of the block where the oil pressure sensor goes...is there another location that would be better? I have the Indy Blue Billet oil pump on my hemi, and a single -12 AN hose going to an Indy swinging pickup.

Thanks, Mark

this is what I use.

easy and effective

https://www.summitracing.com/parts/...l-sr4yUpfOwXIk6J0V5zKcuqSogaAhBJEALw_wcB

I had that problem in the eighties and Kendall green oil cured it. That stuff would cling to anything! Too bad it is gone!!!

Now I'm really baffled.
Got a loop in the line at the back oil line.
Front line goes up and over pump, so that one definitely holds oil in the filter. Tightened up all the fittings again. I was able to tighten them up more for some reason.
I started it up and now only 3 days and it lost prime.
Turned off ignition and turned it on and it took about 20 seconds to get oil pressure.
I did use the oil accumulator and got 25 psi shot into the motor.
But oil pressure did not go up quick enough for my liking.
Wondering if they make a 1 way check valve for the bottom oil line?
Going to try again tomorrow and if I lose prime again I'm going to change out the oil filter back to my trusty WIX.