How to remove cover under washer fluid tank?

Looks like the Tundra is leaking windshield washer fluid. When I fill up the tank, water drains out the bottom. I tried to feel around underneath and maybe it's the tubing that's leaking? How do you remove those flange like bolts without destroying them to take the cover off?

 

It might just be the little washer around the filler neck base that connects to the main rez leaking. Mine leaked bad when filling the fluid all the way to the top until I pulled it and cleaned it up. It still leaks slightly, but not as bad until the fluid drops below the neck to rez level. Maybe you have the same situation?

 

Welcome aboard from SoCal.

 

Thanks for that. I'll work on removing the cover underneath so I can get to it. Any advice on removing those plastic "bolts" that secure the cover?

 

Thanks. 2002 Tundra. Thank y'all for being here. It's a nerd forum for trucks!