It's a effect of a recall GM had on 2000 full length (Suburban Yukon) SUV's to change the connector and the fuel level sensor. Now most GM pumps and therefore a lot of aftermarket pumps come with the new style plug built on and the pigtail to convert the harness. Since the GM recall kit came with a fuse, someone thought it was needed on them all. The recall kit came with a 20A fuse JUST LIKE THE VEHICLE WAS BUILT WITH so to make a long story short, don't worry about it.