1/2" Air Bubble In Line Oiler From Oil Tank

I have a question to ask you pro owners, I was checking up on the oil line hitting the the mag side intake and bulk head when I noticed that I had a 1/2" air bubble in the oil line at the base of my oil tank. At this point I was wondering if the oil line had been bleed. I called my dealer and he said to bleed line. I asked him to look at one at his shop to see if he had the same problem. No he did not, I cracked the bleeder at the oil pump and let it drip. I could see the air bubble going away. I tighten the bleeder after awhile and started my motor and held the oil pump wide open for five mins. I shut it down and looked at the line and there is the air bubble same size. I took off the oil tank to make sure it was flowing all right and it ran out full stream. Any ideas or what does your look like. I have 150 miles on sled. I also need to add bottom oil line to oil pump the hose clamp is not on the fitting it just clamp to the hose. tried to get it back on with long plier to no luck , remove can and I will soon get it.

Thanks

Did you note the lower oil line to oil pump clamp is not on the fitting. look close at two of the pictures.Mine is clamped to hose only.