I recognize the possibility for disaster here, but having a 40g reservoir sitting above the level of my sump would put the same sort of pressure on the float valve and would result in the same situation (of the valve leaking), and would have nearly the same consequences as having the RO directly plumbed in minus a few gallons extra on the floor.
I figured this way was going to be easier then the large garbage can method (that's what I was going to do in the first place), as I wouldn't have to worry about raising the can above the sump level, and I wouldn't have to haul a bunch of water across the house (as my RO in in the Bedroom sink and the tank is across the house in the living room). Plus this way I don't have to worry about a hose drilled / siliconed in letting go.
Regardless of all that, I found out what the problem was after playing around for an hour this morning. The seal where the RO line came in was no good anymore, so after taking it all apart and putting on some teflon tape its working well! 5 hours of being hooked up (at full pressure) and the level in the sump is dead on. I am going to turn the RO's 5g pressurized reservoir off and throttle back the input on the RO unit anyways.
Thanks for the info on the shutoff valve / pressure solenoid, Christy and 220G. I don't have the valve but it is something that I am going to look into for the future.
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