whats the best way to tell when the fuel tank is full

I personnaly disconnect the vent line on the muffler side when filling and when I can see some fuel coming in this one I know it's completely full.

Séb

An overflow tank helps save the grass and your fuel for future use. Or else you can just wait till the Nitro squirts into your eye.

What Seb said is what I do as well. Disconnect the vent line from the muffler and when the tank is full the overflow will come out the vent line. I actually have a small catch bottle that I hook up to the vent line to catch any overflow so that it's not wasted. But that's just me!

Ken

[color=#FF0099]Ken,
I never thought of using the overflow bottle....I just make a gieser out of the vent line , perhaps I'll find a bottle....good idea!
Bev

BTW, Happy New Year and all that jazz!!

Bev,
I just used a 2 oz Dubro fuel tank that I had laying around. Works great.

Ken

Same as above and on my cowled engines I fill until it starts to come out of the exhaust. I can kind of tell when it gets close because of the pitch (sound) of the electric fuel pump I use.

when the pilot in your plane starts yelling...."Help! I can't swim"

I just use an old medication bottle (lots of those unfortunately) and epoxy a short tube into the lid. Works good.

Note: Don't mistake for medication at a later time.[:'(]