I hate those things. In theory they are supposed to filter particles as well as water out of the fuel. They do work, WHEN they are working. Most of the ones I've had on various pieces of equipment constantly leak. Even the new replacement ones are not very good and end up leaking in short order. A lot of it has to do with the gasket material for the bowl not agreeing with today's ethanol fuels. If you can get ethanol free fuels it isn't a problem, but in my area all grades of fuel have 10% ethanol.