Never smelled or heard any of my LPG tanks venting, they shouldn't be completely full, the filler should stop leaving space for heat expansion in the tank.

I presume this vehicle is new to you, there might be separate fillers for each tank and you might have to manually switch over between tanks.

Presumably you also have a further petrol tank as well because its most unusual for an LPG converted car not to start on petrol then switch over automatically once up to temperature unless its been set up deliberately for manual changeover, usually the lights on the switch change when it switches over to gas.

LPG gauges are notorious for being worse than useless, on a cool morning you should be able to see the level currently in the tank via the condensation on the outside.

I'd slip into an LPG converter for advice and to get the system checked over, you do not want propane seeping out anywhere.

Edited by gordonbennet on 04/06/2016 at 09:33