If your connector got hot enough to deform the plastic then the female contacts are likely weak and oxidized from heat, so as Bill suggests it may be best to splice in a new connector, either a good used one or from the likes of Dave Barton. So, why would it get that hot to start with as you likely rarely remove the relay? Well, two things, the fuel pump may be getting worn and drawing more current than the relay can handle and the relay contacts may be worn and not able to handle even a normal current. I'd want to also replace the relay and make the old one a spare to keep in the trunk. Fuel pump relays were always a weakness in the old Volvo injected engines.
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Dave -still with 940's, prev 740/240/140/120 You'd think I'd have learned by now