thanks for the ideas, tried the Ali brazing rods, my blow torch didn't get hot enough, tried lead solder with plenty of flux ( don't know if this will last), put some water in to check, all seemed fine, it sealed the tank connector, half filled tank with water, now leaking somewhere else F###########
Has anyone used tank sealer liquid/paint before, any good ?
I'll replace the tank in the future, just trying to get it roadworthy at the moment, but quickly running out of cash.