Might be a stupid question BUT is there a by-pass screw in the oil pump?
and yes your 15mm oil line is too big - think how easy it is to suck water up a drinking straw, try doing the same with a piece of 19mm PVC pipe - much more effort required to lift the liquid!!! thats Physics!
and yes your 15mm oil line is too big - think how easy it is to suck water up a drinking straw, try doing the same with a piece of 19mm PVC pipe - much more effort required to lift the liquid!!! thats Physics!