ORIGINAL: Rocketman_
And yes my UCD 46 with its Saito 72 leaks while parked but it runs perfectly on the ground and in the air through any maneuver with no assistance from regulators or pumps.
I handle my siphoning problem a different way. Since the UCD 46 cowl covers my Saito 72, I use a Sullivan filler valve to fill the tank. This valve requires no special fitting to fuel it, just a short length of brass tubing. Between flights I just stick a plugged piece of brass tubing in the valve to block it. This is no more labor intensive that switching off the receiver after each flight.
If your not bothered by the fuel seepage issue on your 72 then you won't be on the 100. The problems are identical. Buy the 100 and use the brass tubing method on it if you want to save $43.