Re: Copper Tubing Fuel Tank
If you have a torch and it won't get the pipe hot enough beg borrow or buy another torch and and use both at the same time. Your idea using the charcoal starter should work also. In the early days of bicycle building they used a charcoal fire to braze the frames. They would put the filler material in the joints and put it on the fire.
All times wasted wots not spent ridin. Get a bicycle. You will not regret it. If you live. Mark Twain