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What if we put one fuel pump/filter and (pressure regulator, if needed) in each wing right next to the tank? We could also install flow sensors to operate our electronic fuel gauges in the wings.
Each pump has its own electrical circuit and is pilot controlled, the pumps are positive shutoff, this feature will fulfill our Canadian requirement to be able to shut the fuel off from the seated position.
The fuel is drawn from each tank as the pilot see fit, eliminates the four way valve commonly used, keeps the fuel lines routed the shortest, as the engine needs a pressure system to run, low or high wing craft could utilize this configuration.
Plumb the delivery lines from the front of the wing down to the firewall, enclose fuel lines in aluminum tubing run next to cabin supports, final filter/water trap/drain engine side of firewall, then to engine.
KISS and weight are my goals, pick this apart or add to the idea, all comments are appreciated!
P.S. going to post this to the Viking site as well!
Well here is the right wing, pump, low pressure filter, restrictor on return line to maintain required pressure at the Viking 170hp engine. The pump is positive shut off so no mechanical valve required, 24 gallons in the right wing and 24 gallons in the left wing, each "system" will be controlled by its own switch, the fuel lines will be routed down the forward top cabin frame tubes and will exit the cabin frame on the engine side of the firewall which eliminates any fuel in the cabin area. i will also install my flow transducer in the wing as this will be my primary fuel measurement instrument.
the fuel shuts off, for those of us with fuel injection, regardless of positive shutoff, no power... no fuel, but having two separate fuel systems helps, if power is lost to one side the other should be available.