Once again I'd like to thank all those who offered help. A couple of notes to add: The 4-way valve (I had to dig for this one) is on the Astazou II engine only and the electric fuel cock (and fuel valve) is of a different type also, although it functions with the same circuit inputs. I should have remembered this as I was a tech on the 318C but that was over 40 years ago and the hard drive is old and corrupted these days.