Plugged fitting 657x carb rebuilding issue

[dwe19]

Help me please.
I am rebuilding the carbs on the 657x and the PTO carb fuel fitting that comes off the crankcase (the 90 degree bend is plugged). I have tried pressure and vacuum with no movement. The goo was pretty thick.
How can I clear it.
I have attached photos of the part in question. Please help.

 

[Mraw]

You could try some wire or pipe cleaner

 

[dwe19]

Ok so holy crap how small that orifice is. I was able to look down the fitting towards the return fitting and finally see a small black dot. I had my 15 year old use his eyes to stuff a tiny stainless wire down thru it and push past about 3/4 inch We kept the wire in and sprayed brake cleaner and carb cleaner thru until we started to get drops out the return. Finally we got flow.

I don’t know how long that was blocked but it was blocked hard. What happens to the carbs if that was blocked.