My buddy usually does the work on my car, but we can't figure out the name of this part to get a new one. Pretty sure the previous owner just used glue to re-glue it, wonder if I could do the same thing. If anyone knows the part name I would really appreciate it. The green part. I know it has to do with the gaseous form of the gas, but that's it. 

Well my guess would be it is a Schrader valve. They are used on both pressurized fuel and air conditioning lines. The simplest Schrader valve is a bicycle tire valve. It allows air in or out once the center pin is depressed.

Purge solenoid that is attached to the EVAP system

I associate the green color with a service/test port for the EVAP system, which as I understand it, aims to hold 1 psi pressure above the gas in the tank to restrict evaporation. So a well glued repair should be able to stand that kind of pressure. Maybe it wouldn't be an easy part to find a replacement for.

http://www.oreillyauto.com/site/c/detail/BWD0/CP560/02211.oap?year=2006&make=Pontiac&model=G6&vi=1431838&ck=Search_canister+purge+valve!s!solenoid_1431838_3354&keyword=canister+purge+valve!s!solenoid

 

I am pretty sure this is the part.  Glue will hold it probably for a couple of years.