Fuel system

I have decided to develop a " day-tank", which is a 20l tank that I will use to get out of the marina and back, allowing me not to carry around 110l of fuel in the main tank.

Step 1 is to build a secure box for the day tank. Following will be the creation of a fuel polishing system. 

Here is the day tank under construction, upside down. It will be installed forward of the vertical bulkhead between the rudder stock and the engine. I'll take photos. 

A marine plywood box, secured at the back to the bulkhead, and supported on a piece of timber on the bottom.  Screwed and epoxied in place.

Update 14/4/14

Here is the schematic for the proposed fuel system.

Update 18/4/14

The fuel system is coming together. Here is the fuel tank containment unit, almost ready to fibreglass into place. Another photo with the tank shown. 

And here is the basic layout if the fuel control centre. Three 3-way valves controlling:

1. What tank feeds the engine

2. Directs the main tank to the fuel polisher

3. Controls the fuel return destination

This system will be mounted on a pre-fabricated panel, with the polishing filter and pump, then fixed to the bulkhead adjacent the main engine Racor filter

Missing is the 12v lift pump (100l/min) which I have yet to source. The laminated drawings show the position of each lever at the required outcome.

Update 25/4/14

I'm edging toward the completion of the fuel distribution centre and day-tank. The tank container is now glasses in place with several layers of cloth and epoxy. 

I have also fixed the various brass fittings on the 3 way valves with pipe-loc fluid. I had to fabricate spacers out of thick walled aluminium tubing. Use a rotary pipe cutter for this and you'll get perfectly square cuts. 

I needed a rubber gasket to isolate the filter housing, I knew there was a reason to keep that old pick-up floor mat.