Having a similar issue and before i replace the pump thought i would post a video of pumping action from the oiler port.
below is what i have done
1. cleaned area of all debris
2. drained oil, rinse tank with e-free gas.
3. pour e-free gas started it.
a. very little gas comes out see video
4. saw were someone pressurized tank to blow out in dirt in oil line
b. not much change in come out.
so I assuming that need to replace the oil pump.
sorry for the jumpy video, but shouldn't it be really pumping out a lot of the e-free gas in a stream?
with oil in it is not much and pretty sure ruined the bar.