leak from fuel pump

Hello all

First time I've posted here. I've recently acquired a 1974 Series 3 SWB station wagon, 2.25 petrol. It's leaking fuel from the union at the carb side of the fuel pump. I've been careful not to overtighten it but after a certain point the tighter it goes the more it leaks when I hand pump. I've replaced the fuel line from the pump to the carb in the hope it was a damaged thread or nipple on the line. Sadly still the same. So I'm assuming now that the thread in the pump body is damaged. Before I replace the pump grateful for views on whether this is likely to be the answer, or have I missed something else obvious?

Any advice appreciated, thanks
Jerry

id replace pump there not expensive ,check olive on new pipe you fitted wasnt damaged when fitted to old pump ,threads are often ruined when people fit pipes