John Deakin covered this at length in his articles on avweb.
http://www.avweb.com/news/columns/182146-1.html
you may have to sift through a lot but it is in there. BTW there is a lot of interesting reading in most of those articles!
the upshot was that this will work for a continental but not lycoming. This was verfied to me by an engineer who had worked on our chieftains and had the misfortune of creating a large and somewhat flamable puddle under the machine while doing an engine run. But for the grace of god no fire occured.
