Align the bolt holes of the tank hinge base.

Place the hinge base bolts into their holes and turn them clockwise by hand a few turns. Do not tighten them yet.

Align the the front mounting bolt holes and place the front mounting bolts into their respective holes. Turn the bolts clockwise by hand a few turns.

Don't forget to put the small metal inserts back into the front mounting holes if you removed them earlier.

Tighten the four tank mounting bolts with a 10mm socket wrench or box end wrench until snug.