Do you know what part of the fuel pump relay is blowing? It has a couple of functions.
If its the fuel pump output that's going then most likely is a faulty fuel pump or wiring, rather than anything in the engine/loom
Easy way to check, pull the power wire off the fuel pump (and wrap it for safety) run a new wire with a fuse from the battery to the pump and start the car
If the fuse blows your issue is at the pump, if it doesn't and the relay is also ok then its most likely the wiring from relay to pump
So if its the fuse it could be the pump or the earth wire to the shell, so check/change the earth and try again. If it still blows the fuse get a replacement pump
If the pump doesn't blow the fuse but the relay still dies you need to dig into the loom and look for breaks, or change the loom.
Hi manta sport. It's the terminal that is wired directly to positive of battery that's melting. With 12v applied to relay it still actuates but no continuity across the fuel pump output wire and the 12v input. Fuel pump runs if I bridge the terminals in relay harness.
Thanks for your advice.