Is the connection between the clear plastic line and pump air tight?

Do you bleed air out of the line with the bleed screw?

Is it an early pump (28-30) or the later 31 pump?

Thanks for respond, I will tighten the hose (both ends)  and I know rubber tubing is not a good idea no matter how tight. The line has not been touched for two months with oil in tank. In the beginning it had a big pocket of air at the top of the hose where it connects to tank.That air pocket eventually went away. No bubbles till the motor runs. The pump is a 1931 pump and I am going to put it in lathe and get the oil flow amount as George suggest but for now I drain oil every 10 miles ( my round trip for the day) and pump  in fresh oil every time. I also measure the amount and look at the color of it also.It usually is 2.5 - 3.5 oz. every time.I change the  adjusting screw on pump some times to see if I can have the proper amount in crank case when I drain it . I don't have a cable hooked to pump maybe thats a issue. It doesn't leak a abnormal amount of oil when it sets.

Conrad

Tim,

   Thanks for information! And everyone else also. I will  check all that is mentioned

I am tightening hose on threads both ends. I will continue to find all the  possibilities that I can figure out. I have a spare pump that I can use to understand all that's involved. I really like this forum we  have for club member's.

   Thanks Again,

    Conrad