Articles in this category Fillpoint leaking after filling up with LPG. In every GAS IT LPG fill point there is a valve that is designed to close when the fill gun is removed. On the very rare occasion the vehicle filling up on the same pump before you didn't have a dust ... Checking for leaks, what do I use. When checking for leaks on gas equipment there are a several ways of doing this but there are only 2 easy ways to do this and there is one very important thing to note about which fluid to use. First...