I feel great, after much thinking and planning, I finally had all the modifications and parts to install a 15 gallon long-range wing tank inboard and a 12 gallon auxillary wing tank outboard in both the left and right wing.
Here some of the challenges
1. I needed a return fuel line back to the same tank as I am drawing fuel from to allow for injection engines circulating significant amounts of fuel.
2. For the type of long distance back country flying I intend to do, I wanted fuel capacity for 10 hours of flying without refueling. Now with a total of 54 gallon of fuel and 5 gallon fuel burn/hour I have 4 gallon reserve on a 10h flight.
3. The initial design was to build two freely communicating wing tanks, but that would likely have resulted in plenty of fuel spilling due to wing dihedral, during turns, and when parked on uneven ground. Installing a remote controllable fuel shut-off valve between the inboard and outboard tank prevents fuel spillage and allows for isolating extra fuel capacity.
4. To my big surprise, I could not find a light-weight 3/8" solenoid fuel valve, instead settled for a ball valve operated by a linear actuator.
5. An ANDAIR FS20/20 duplex valve was used to direct the fuel supply and return to either the left or right wing tanks.
6. A ball valve controlled shunt between the left and right wing still allows for left to right or right to left cross feeding.
