Pull the first aid kit and the sending unit under it to inspect the tank. If it looks ok, leave it in place, pull the strainer in the bottom from under the car, flush the tank, use an algaecide and you should be good.

Replacing the tank isn't technical, bolts, nuts hoses and messy fuel.
WEAR GLOVES AND EYE PROTECTION!

Good luck!!!

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"Rudeness is a weak man's imitation of strength" - Eric Hoffer