Posted By George Wedgwood Bob, you could try talking to Calor and look at their web site on http://www.lpg-business....lpg_fork_lift_trucks.htm It should be easy for them to suggest a way of measuring the level of fuel left and I am sure they supply such systems or can suggest a supplier. Just please don't let anyone try a 'home made' attachment and compromise the safety of the pressure system! George

Posted By Simon Wilkins I'm afraid that a pressure gauge won't tell you how much liquified gas is left in the cylinder. It will in effect tell you its temperature and hence its vapour pressure - this won't change until the cylinder is very nearly empty. As Laurie said, you normally need to weigh a cylinder to tell how full it is, and maybe reset an empty (tare) weight value when the cylinder is changed. However, some cylinders do have a built-in liquid level gauge to show how full they are, and I have read somewhere that you can get a liquid crystal strip to fix to the side of the cylinder. This would work by showing the temperature difference between liquid and gas provided that the cylinder, but thinking about it may not work with a FLT which typically take the liquid from the cylinder and not vapour. Hence the gas is not being vapourised in the cylinder but externally so there may not be much temperature difference. Simon