hissing noise

[phatvtcom]

yea its just the little rubber hose thats come off, ive had the same problem on my LPG system aswell. I took it back twice to the gas converters and they ended up putting a tighter hose because it kept coming off constantly. I had some chugging on ignition too. Just take it to a gas converter joint they should do it for free on the spot, it takes like 10 mins

 

[whitey66]

The purge solenoid is at the back of the engine on the driver side.The plastic hose goes through the inlet manifold and is a bit hard to get to.
A lot of gas systems on these cause the engine to backfire,and this can blow the vacuum hoses off.But after saying that,even non gas cars can have this problem too.
You can put them back on with a pair of pointy nose pliers and some superglue,takes me about 2 minutes to do now (i've done heaps of them).