BB Oil pump loses prime

I have the milodon pan with the static remote pickup and the Muscle Motors pump cover. This car is an original 69 Cuda 440 car so the k-member supports for the steering box require the line to the pan to go around the k-member as the pictures show.

I have primed the oil pump three times by breaking the connection at the bottom of the curved tube and shooting lubriplate into the suction side of the pump and then running the pump with a drill. It primes right away and I ram the pump for about 5 minutes. I waited for 1 minute, started the drill, pressure ok, then 5 minutes, started the drill, pressure ok. Then after 30 minutes and checked prime again, and no pressure.

Any ideas would be greatly appreciated.

It might help if you could run a section of line above the pump then connect it to the inlet on the pump. What
little bit of oil in the line would rest against the pump keeping it "primed". Kinda like whats pictured below. I noticed with the MM pump cover that I'll loose prime after 2 weeks of setting. My Milodon never did that. Could set all winter and still have oil pressure at startup. Thank goodness for an oil accumalator!

Is your cover a mm cover? Yours exits the back of the pump, mine out the top (or bottom).

Here's how mine are. Zero problems. You need to figure away to put a loop in it.

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you have an air leak

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This can be caused by excessive clearance in the pump to end plates. It takes very little extra clearance to create problems. A high point in the lines will fix you up.