1917 oil pump

Unknown

Hi Guys;

Looking for some help with my oil pump on my 17. When I prime the

pump and run the engine I get normal pressure. Around 3 to 3 1/2

pounds. But when I let it set for more than two or three hours I lose

the pressure and I have to prime the pump again. I have looked for

leaks and tighten all the fittings. I pulled the check ball out and

cleaned the seat. Still no luck. I have a loop in the oil line where

it conects to the pump to keep the oil from running back in to the

crank case. Anthing else I should be looking at? Gene.