to be certain use a clear line and see the fuel/oil get pushed/sucked up and in the top of the engine barb. not much else you can do
see Johnson manul RED book page 231 and others by mdl type.
experts can chime in but I doubt it would be clogged…. otherwise fuel-oil would accumulate down below and performance symptoms would eventually develop .
millions of these oiler lines work fine… can’t say I ever read anything bad happening because of a clogged one.
Joining AOMCI has priviledges 🙂
