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JohnAz posted 11-21-2002 11:23 AM ET (US)   Profile for JohnAz   Send Email to JohnAz  
Having a 25 gal fuel tank built in, to increase range I spliced a "T" fitting between tank and primer bulb and installed a OMC ,or any other brand,fuel fitting. With several extra 6 gal fuel tanks, I can run off these extra tanks,and they will siphen into the main tank ,as well as run the engine, when the 6 gal tank is empty just unplug it and hook up another, or keep running,,so far it sems a good way to extend range and not have to pour gas into the main tank under way,,,
Drisney posted 11-23-2002 05:09 PM ET (US)     Profile for Drisney  Send Email to Drisney     
John, What a great idea ! so the fuel line that comes from the "T" to the aux tanks is terminated with simply the female fuel fitting? What makes it use the aux tanks first? a valve? Or simply suction from the main tank?..Dave
JohnAz posted 11-23-2002 05:40 PM ET (US)     Profile for JohnAz  Send Email to JohnAz     
The 6 gal tank is higher than the main tank,
so the fuel will be drawn from that tank first,,if your main tank is empty it will fill from the 6gal one,,the only thing to remember is just as the 6 becomes empty you must un-plug it to close off the line, or you will suck air. I guess there might be a floating check valve to automaniclay seal the line when there is no more gas present. The best method is to start a long days running on the extra tanks then use your main tank last,,best thing is no fuel spilling.
Steve Leone posted 11-23-2002 08:47 PM ET (US)     Profile for Steve Leone  Send Email to Steve Leone     
John, that would be an anti-syphon valve. Seadog puts them out I believe. 1/4, 5/16 or 3/8`s barb on one end, pipe thread on the other. Has a check valve inside. These were designed as a safety feature but may work in your application. Steve
JohnAz posted 11-23-2002 09:01 PM ET (US)     Profile for JohnAz  Send Email to JohnAz     
Thanks steve,,,the "ball" in the valve would have to let the gas flow through, (in effect floating) when the gas ran out the ball would have to stop the flow of air, so the fuel would be drawn from the main tank, not air from the 6 gal one
lhg posted 11-24-2002 06:35 PM ET (US)     Profile for lhg    
I have my 18 Outrage rigged to use two Tempo 13 gallon reserve tanks under the RPS, Montauk style.

I considered installing one of the three way valves, which I would consider mandatory for proper operation, since then you can determine whether you are drawing from the belly tank or reserve tanks, with no suction problems. But I found it much more simple to just buy a spare gas line for 10 bucks and plug it directly into the engine when needed.
If an engine does not have a plug-in fuel line, then the 3 way valve must be used. Tempo makes these, but they are quite large.
I would think these splice-in connections would be made before the fuel filter.

As far as which to use first, I always run the belly tank dry first, completely eliminating guesswork as to how much fuel I then have left. With the reserve tanks, it is easy to be precise & not get stranded. With a built-in tank, its a guess. The definition of reserve means "use last" I would assume.

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