My son and I have been flying our LT-40 daily since the July 4 holiday. Except for busting both motor mounts when we put the starter on it and a minor prop strike on the runway (my 11-5 APC is now a 10.5-5) everything has gone very well.

I have one of those cool Slimline aluminum caps and manual fuel pump for our 1 gallon jugs but find we have to disconnect the engine pickup line to fuel up the Kadet's 8 oz clunk tank. On our control line ships our tanks have 3 tubes - the pickup tube and an upper and lower vent. Simply attach your pump or syringe to the top vent then it is full when it runs out the bottom vent.

R/C clunk tanks usually only have 2 outlets. One pickup line and one vent line which we have connected to the muffler pressure tap. Try to fuel through vent tube and you'll flood your engine. To fuel through the pickup line I have to disconnect it.

I've seen the "T" fittings (which I'd have to uncap and recap every time) but haven't figured out how those fuel "dots" or quick fuelers work. Keep in mind we have a simple box fuselage trainer.

What system do some of you use?

When I can get at the carb, I use a two line tank and just disconnect the line from the carb to refill the tank. When I can't get at the carb I use a 3 line tank setup and terminate the fuel line with a fuel dot.

most, not all of my planes have a 3 line set up a fill line, a pressure line hooked up to the muffler, and a fuel supply connected to the carb.
when fueling disconnect the pressure line for overflow and fill through the fill line, extra fuel can be captured in a small container and poured back into your fuel can. on a couple of my planes I use a small machine head cap screw for a plug on the fill line 1/2" is long enough push in and screw out. for my cowled models I use a fuel dot they work great also.

Threeline set up with a fuel dot whether the engine is exposed or not. Constantly removing and replacing the fuel line off and on the carb nipple will eventually cause the connection to the carb to stretch and allow air into the fuel. A fuel dot is the way to go.
Regards,
doubledee