Having now unbuilt the rear of the car to get to the fuel tank, I can see that the fuel sender/ pick up pipe is where the leak is coming from. The weld/solder is not sealing the pipe to the top of the unit, it appears that when the guy built this car 1997, he also had that problem and sealed it with a silicon type material, which I am sure was not the right solution , but it last a few years! Could anybody suggest a suitable solution, I really do not want to have to take the unit out as I am sure that will then cause further problems, which are nor easily solved in our current Corvid-19 situation. Please see attached photo, thanks in advance for any suggestions.