Fuel tank spillage

[cppursell]

Hey peoples, a quickie for you:

My behind-the-seat fuel tank spills out of the top past the fuel cap, especially when full. The opening slightly bent, which is causing the problem, and my cap can't handle it. It's been doing this for a while but I've only started noticing it since my paint job. I tried fixing the dent by hammering at it, but it's no better. Fuel is spilling on my cab and my stepside fender. The only real solution I see is to get a new tank, but is there another way to fix this problem?