All you will need with the oem GM EFI in tank fuel pump is the required pump persuader. A rubber mallet. If/when the in tank oem pump starts crapping out on ya, wack the bottom of the fuel tank with the "service mallet" and you'll get home. Put wing nuts on the fuel tank mounting straps or do what everyone else does and cut/fab a service door in the floor above the fuel tank to allow quick easy serviceing.
Don't leave home without it (the mallet).