Uniflite's fuel systems are robust, if a bit complex. I've never seen an unmodified Uni fuel system that included bottom feeds that would enable passive level equalization. They seem to have had an aversion to fittings on the bottoms of their tanks. FYI, ABYC standards now prohibit fuel fittings anywhere except tank tops in gasoline-powered boats.
If there's a provision for moving fuel between tanks, there has to be a transfer pump somewhere in the system. If there's no pump, and no bottom fittings, the manifold is just for supply and return. Having said that, I have no idea how your particular system works. You may have to find another 46 owner who has figured it out. One source may be Tom Laskey, a surveyor in Florida. He and his wife live on a 46. Or, at least they used to. I haven't seen Tom in a long time. Here's his website: http://www.floridamarineyachtsurveyor.com/ On Sun, Jun 22, 2014 at 6:10 AM, Doug Thomas <[email protected]> wrote: > Yes, I did the diagram and labeling, but it looked to me like it was for > transferring fuel from one side of the boat to the other, not between fwd > and aft tanks - see attached photo. And it's a guess as to where all those > lines go. My biggest fear is shutting off the wrong valve and having an > engine shut down half-way out the channel in busy traffic. > > > > On the attached diagram, 'on' means the valve is open and fuel is flowing, > 'off' means the valve is closed and no fuel is passing through that valve. > > > > Do you agree with my interpretation, or am I all wet? > > > > Thanks, > > Doug > > > > *From:* [email protected] [mailto: > [email protected]] *On Behalf Of *Den > *Sent:* Sunday, June 22, 2014 5:09 AM > *To:* [email protected] > *Subject:* [UnifliteWorld] Re: fuel routing > > > > It appears as if ALL transfer valves are open.A photo of your fuel > manifold would be helpful. Shut off the AFT tanks. and see if the fuel > level changes after a run. Remember that there are supply. and return > valves to each tank. Mine is a 48, and I studied the fuel panel for a few > days before the lightbulb came on. A labeling exercise soon followed..Take > a quad pad below, and draw the system.All valves, and where you think the > lines come from. It may help. > > On Saturday, June 21, 2014 8:03:28 AM UTC-7, Doug wrote: > > Can someone explain how fuel is routed between the four tanks of a > Uniflite 46? I have two forward "saddle tanks" of about 68 gallons (I've > been told) and two master tanks aft of 182 gallons each. I notice on the > fuel gauge the saddle tanks rise and fall as fuel is consumed. That is, the > forward tank will read half full, then it will read full and again later > back to half full. I assume the excess diesel fuel is being routed to the > forward tanks which causes them to fill, but then how do they go back to > half full? What mechanism is in place to cause fuel to go one way, then > reverse out? > > > > I'm confused. > > > > Thanks for any explanations. > > > > Doug > > -- > You received this message because you are subscribed to the Google Groups > "UnifliteWorld" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > Visit this group at http://groups.google.com/group/unifliteworld. > For more options, visit https://groups.google.com/d/optout. > > -- > You received this message because you are subscribed to the Google Groups > "UnifliteWorld" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > Visit this group at http://groups.google.com/group/unifliteworld. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "UnifliteWorld" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/unifliteworld. For more options, visit https://groups.google.com/d/optout.
