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It is fairly easy to rig fuel to both engines from one tank at a time, and that is what I would do. I do this in my dual engine Ribside 21, which has up to four tanks to draw from, one at a time.

You want to use a Moeller *3/8"* (not the 1/4" size) three way selector valve, which can easily be mounted in a readily accessible place. Each fuel tank feeds the valve through 3/8" hose, which selects which tank you are drawing from and automatically blocks off the other one. From the valve, a 3/8" line goes into the fuel separator, which in turn feeds both engines.

If you want to use two separators, a tee is inserted off the valve, so that each separator, and engine, receives fuel.

If you look carefully in the lower right of this photo, you can see my selector valve installation in the Ribside 21.

http://smg.photobucket.com/user/lgolt...5694997256