[Build-It-Break-it]

I think you might have issues later with the way you welded it in. The Tanks Inc fuel pumps are made to be a basic install without the welding and usually include an internal baffle . I think your tank might end up rusting inside and some of the weld slag at the bottom of the tank that isn't removed will become loose over time along with some of your mig welds. If anything it should of been tig welded in.