Hi Geof, I dont think Robert Chave is still a member, but Brian Maxwell, now unfortunately deceased, submitted an article in the Winter 2006 edition of the Newsletter on the fuel polishing system he had fitted to his F34. I dont think I can attach documents to this response, but if you can give me your email address I would be very pleased to email to you the article as an attachment. The article does include a very useful diagram of the plumbing and valves needed. Tony Gurney