GBBs are normally pretty foolproof.
Got mine working first time... after a week, cause' the damn propane adaptor had faulty threads.... :lol: Longest week of my life.
Did you fill it upside down? You have to do this, mag on bottom, gas up top.
I suggest you bring it to a local for advice/exchange.
RS Type 56-1 & RS Type 97B & KWA M11A1 w/steel kit
KJ M1911A1 & KSC G19 + AI Grenade