There are 3 way valves out there that allow you to draw from one tank or the other or both at the same time.. depending on how you position the lever. Or, you can do like I do, and have a main tank connected to one side of the valve and on the other side of the valve intake I have a standard brass Johnnyrude fitting so that I can hook up portable (plastic) tanks for those extra long trips. The output line of the valve then goes into my filter, and then from there to the engine.
__________________
1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
|