Back in November, right after I received my airworthiness certificate from the FAA, I redid my dual Facet pump arrangement. Originally, I had a common line between the left wing tank and the right wing tank. Both of my facets were originally drawing off the common line. There were no installed check valves to prevent recirculation of the fuel. All the testing I did proved that fuel would not flow back through the Facet pump except for minute seepage. Dan's testing also proved this. However, I did not like the fact that I was drawing off both tanks simultaneously therefore, I decided to do away with the common line and have one Facet pulling from the right wing tank and one Facet pulling from the left wing tank. Both of the Facets pump into a common Tee which feeds to a fuel shut off which then feeds to the carburetor. The only thing which prevents me from pumping from one tank into the other is the backflow prevention of the Facet not being used. I can run the right tank pump independently of the left tank pump and manipulate my fuel from which tank I wish to use. Since I have changed to this arrangement, I have run both wing tanks from full to empty. In doing this, absolutely no indication of filling one tank from the other was indicated by my fuel gauges. What ever amount of fuel that was pumped back through the pump not in use was so negligible that the gauges were unable to detect it. I am completely satisfied with my fuel set up and am much more confident operating the tanks independently of each other than drawing of a common line like I was originally doing. Dan did some very nice documentation of his test and what I personally have learned from my fuel set up only backs what Dan has shown us all.
Mark Jones (N886MJ) Wales, WI USA E-mail me at flyk...@wi.rr.com Visit my KR-2S CorvAIRCRAFT web site at http://mywebpage.netscape.com/n886mj/homepage.html ----- Original Message ----- From: "Mark Langford" <n5...@hiwaay.net> To: "Corvair engines for homebuilt aircraft" <corvaircr...@mylist.net> Sent: Saturday, February 19, 2005 7:23 PM Subject: Re: CorvAircraft> Fw: KR> Fuel Pump Tests > John Brannon wrote: > > > Just keep in mind that this is for a specific Facet > > pump and there are many. In this case the pump tested > > does have a check valve and does not have an > > anti-siphon valve. > > I don't know what the N on the end of "40105N" means, but the "40105" is > listed as having neither check valve nor anti-siphon valve on Facet's > website at > http://www.facet-purolator.com/solidstate.asp . Anything's possible though, > I suppose. A Google search for "Facet 40105N" yields no hits, so I suspect > the N isn't really part of the part number. > > I think the message to be gleaned from Dan's testing is that a little > testing goes a long way toward clearing up any questions one would have > about a particular fuel system setup, BEFORE it's test flown... > > Mark Langford, Huntsville, Alabama > see homebuilt airplane at http://home.hiwaay.net/~langford > email to N56ML "at" hiwaay.net > > > _________________________________________________________ > search the CorvAircraft archives at http://www.maddyhome.com/corvairsrch/index.jsp > to UNsubscribe from CorvAircraft, send a message to corvaircraft-le...@mylist.net > Other CorvAircraft list info is at http://www.krnet.org/corvaircraft_inst.html >
