What does this part do?

Purge Base Assembly
Part Number: P005001890

My BP 250 wont start so I did the following.
Replaced: Plug, air & fuel filters & all fuel lines. Fresh fuel & oil mix. Pulled carb to see if dirty, (wasn't)
Doesn't look like plug is getting fuel? I pull it out & it's mostly dry. Won't quite start (spits, pops) when I add fuel directly down spark plug hole. Maybe spark isn't strong enough? Though it lights my spark tester no problem. My compression is around 130 lbs so that seems fine? I'm stumped!! Help!!