I finished my fuel cell installation tonight. I have some testing to do now ). I picked the "beer Keg" fuel cell because it was the size I wanted (3.5 gallons) and it came with mounting brackets. I also plan to transfer with an electric pump (located behind the left side cover). My thinking with this arrangement is that I won't have to have a cut-off valve - the electric pump should stop the flow when it isn't running. Here are a couple of pics.