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OK, so no gas smell on fuel with air con on, so that should rule out the air con gas.Thanks for your reply Fu Manchu. Can you elaborate at all on what a rich exhaust means? What is the HVAC box? Might there be anything else that might happen to indicate a prob in this area?, the box you spoke of that is. For what it might be worth (i'm no superstar) we never smell gassiness on petrol with the a.c on. Thanks again.
I would actually question if it is a rich exhaust or simply the gas/lp smell prevalent in vehicles running lp systems especially as you say you notice it most when backing off.Can i ask what makes this rich exhaust condition happen?, if that's what it is. Gus.