Outer Limits 4x4 Board

hey guys
could be a stupid question, but my knowledge on the LPG is pretty limited. in my GQ 4.2 fuel injected on gas and petrol there is a hose that runs from the vapouriser onto a L piece thats plumbed into my air intake. the hose is about 20mm round. im just woundering if anyone knows what this hose's purpose is?
cheers.
Adz

Vacuum compensator???

i wouldnt have a clue. i know if it use to fall off wouldnt idle on gas, but since building a new airbox havnt hooked it back on and it runs fine on gas.

Post some pics for us.

yeah i was but realised i dont have any with it in and my car isnt with me. will when i get my car back.

Probably just the vacuum compensator, the new airbox probably flows better than standard. Still better to have it hooked up unless you have zero vacuum in your new airbox, then it's not needed.