Quote Originally Posted by Newfie
One more thing BT, every so often, you have to purge the air and remaining fuel out. Maybe one of the FOGs here can elaborate better as to why, but sometimes my Nibo torch won't light, and it won't take any more fuel. I have to drain it, refill and then I could solder with it if I wanted!!!
I don't qualify as a FOG, but the answer as to "why" is that the butane canisters use CO2 (or maybe O2) as a delivery system for the butane. Thus, everytime you fill the lighter the CO2 ends up occupying some of the space inside the lighter. Since it doesn't burn the CO2 levels gradually increase to the point where the you need to "bleed" the lighter to remove in.