Pics; Checking fuel tank for leaks. Is it ok to run water through it?

[Howieau]

Thanks for the inputs. The soapy water trick went down a treat haha, it is leaking. Dang

Is there a home remedy to fixing or must it be taken to a radiator shop. You can see in the pics a silver strip welded/soldered on it, it seems its not the first leak its had from that spot.

I also found a nice chunk of weld IN the tank when I first opened it up, a bit bigger than a 10 cent coin lol. Crazy

[TC1600]

At work we have a big copper soldering iron (that you use an oxy torch to heat), takes a while but you just solder it up.