Hi guys

I have a hyster 2.50 lpg with the mazda fe engine. Its currently not running. I need some help regarding the lpg vaporiser, i believe that there should be a vaccum line to allow the gas to flow through when engine is cranked and running. There is a line currently connected but it goes the the front of the rocker cover? Which i assume is pressure from engine crankcase. Is this correct or has someone gone wrong somewhere

Any help would be great

Thanks
Matt