Problems with fuel cutting out

I have a 95 Tacoma 3.4 I thought the fuel pump went out so I replaced it but before putting the tank back in I plugged the pump in to test that it worked and it didn't so I figured I had a broken power wire and ran a wire from battery to a 20 amp fuse and 20 amp toggle switch until I could afford to get it in so now the truck will run for awhile or just a few seconds I started messing with it again and checked the relay and switched it with a different one it still dies and then starts back up most of the time I also have power back to the original power wire to the pump while running tell it dies.

 

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