I recently fitted a snorkel to my duel fuel 4.5 litre GU and mine wouldn't get out of the driveway without fitting a balancing tube. I even fitted a safari sock in my snorkel as well as the balancing tube just to be sure. I've only recently had a new convertor and gas computer fitted to mine to as it had been running rough for a while on gas.

Since fitting the snorkel, balancing tube, new convertor and computer it actually goes just as well on gas as it does on fuel which it's never done since I owned it. Now mine doesn't fluctuate at all even on windy days or jaming the brakes on hard which I think most of my problems where caused by a dodgy convertor. Mines also an auto so having it stall is never good.

The sad part about doing this mod is I had to get the info off the internet myself as 2 different gas installers I spoke to hadn't heard of the mod before.

Cheers Mick.