Clean the fuse contacts by forming a bit of fine emery paper into a shallow cone that matches the shape of the fuse and twist this against the springy terminals in the fuse box. You can clean up the ends of the fuse with emery paper, or just fit a new fuse.
When you fit the fuse, press the terminals together to squeeze the fuse while twiddling it a bit to lightly grind the ends into proper contact with the terminals.
If that doesn't work or is unreliable, fit a temporary bridging wire between terminals 4 an 6. This will start the fuel pump, by-passing the relay. You can drive the car like that, but the pump will keep running when you turn off the ignition. That establishes that the problem is with the relay. As you probably know it is white and tucked up behind the glove compartment in a clip. Either replace it, or you can open it up and re-solder the connections inside.
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