The adventure continues.  Today’s episode finds us tackling the fuel delivery system yet again.  You may remember us from such blog posts as “We’re great; Tanks for asking” when we installed the fuel tanks.  Well today we finally hooked one of them up.  Yes one of them.  Not two.  We ran out of fuel hose so only the starboard tank was connected.  We’ll hook the lonely port side up soon enough.

The fuel system install continued with me installing the fuel selector valves.  These valves control two important things.

  1. What tank to suck fuel from to power the engine.
  2.  What tank to return unused fuel from the engine to.

These are also known as Supply and return.

I wanted these two valves mounted together since we’ll most often change both of them at once when switching from one tank to the other.  I also wanted them to be very easy to understand.  I worked out a mounting system so that you point the valve at the tank you wish to select.

To accomplish this, I first mounted the valves to a block of wood and then put brackets on that block.
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I then installed the valves such that they orient towards the tanks.  You can see here they point either to port or starboard.  It looks a little weird hanging out off the shelf like that but I did it for a couple of reasons.  The first is that I made Dani reach into the engine room to see how far she could reasonably reach in over the engine.  I had to get it a smidge closer to her.  Secondly the valves common feed extend straight downwards, so it had to hang out over the shelf unless I wanted to drill more holes. 
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I spent quite a bit of time dry fitting the fuel filter setup.  Its big and bulky and I wanted to make sure I put it in a place I can get to as well as a place that is out of the way.  You can see I eventually settled on mounting it to the all threads that hold the starboard tank in place.
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I fabricated and epoxied a board that would be used.  I also tacked a piece of gasket to the bottom of the board to prevent excessive rubbing.
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To hold the board to the rods I used big zip ties that I slipped through pieces of old water hose to prevent any chafe.  Of course this isn’t “ideal” but it will get the job done for now.  I could not locate stainless hardware to accomplish what I wanted.
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I finally got around to putting together all those weird fittings we had to search for earlier.  The filter manifold has 3/4″ 37 degree JIC male threads. That goes into a JIC to FPT union.  Then into that goes a male 3/4″ to 3/8″ FPT brass fitting.  And finally a 3/8″ MPT to 5/16″ barb.  Whew!
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Installed.  And its more sturdy than I anticipated!  I did a final check to make sure I had plenty of clearance to remove the filters with the cockpit hatch cover closed.
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We installed the fuel hose at the tank and ran it down to the selector valves.
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The supply selector valve goes from the valve to the filters and from the filters to the engine.  The return from the engine goes from the engine to the selector and then to the tank.   Looks pretty clean!
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This is a really crude schematic I made to explain the system.
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Peace!