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My 1984 25' frontier is rigged with 2 equal size fuel tanks in a t configuration amidships each one feeding seperation valve,seperator, 200hp yamaha hpdi. Is it possible to feed both engines from one tank at a time in a main, reserve type configuration? I can't locate flow numbers anywhere?
As many members know, the Frontier is a Boston Whaler Commercial Products Division model based on the 80's Outrage 25 hull. It was offered with a forward Pilothouse.
Do you have inline 70 gallon tanks in the central cavity?
As for flow numbers are you referring to fuel flow for the twin Yamaha 200 HPDI motors?
Sort of and yes thanks for the reply, the tanks are in the center but the forward one is a beam the rear fore and aft making a t configuration (by the deck diagrahm). The max flow I've found anywhere for the yamaha is about 20 gph, and the filters seem to be good for 90gph. They have 3/8 hose from tanks and 5/16 to motors which handle the flow now the restriction would be the 3/8 hose if I've done the research correctly or the vent to the tanks
There is an advantage to dual tanks for twin engines. Redundancy, which can literally be a life saver.
Consider plumbing your dual tanks so that you can operate them in parallel when/if one runs out of fuel. This could be done by installing a cross over line with ball valves. You would then have the safety of redundancy and the convenience of being able to draw from either tank.
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.
