This morning I completed fabrication of the endplate for the new fuel tank. This included cutting a 30mm hole for the fuel sender that is mounted in the inboard side of the tank.
The end plate was then TIG welded in place, and although (as can be seen from the pic) my TIG welding is not always pretty, it is functional as later successful tests with pressurised water were to prove. The welded seams on the radically reshaped tank are leak proof 
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The fuel sender is a 6 hole Lucas type and was supplied in the kit of parts that came with the DigiDash. The float arm is located in the shorter left hand side of the tank as you look at the picture above, and doesn’t access the “Sump” at the lower right of the tank, this means that there will be a “reserve” of fuel left even when the gauge reads empty…. but how much?
So in a rather nice closure to the two current projects I powered up the Digidash with a 12v battery, connected the fuel sender to the appropriate input and started filling the tank with water. After about 6.2 litres the gauge moved off empty and it read 100% full when I had poured in 18 of the tanks maximum capacity of 19.5 litres. Fab! now I know that I have just over a gallon in reserve when then gauge hits zero, and 19.5 litres of fuel in the tank when it’s brim full plus about another 1-2 litres in a swirl pot should give me a fuel capacity of 21L. That should be more than enough for a 15 lap sprint race or a 25 minute testing\trackday session