Bed rust removal and repair

Howdy all,

I’ve had my Tundra for about two weeks now and absolutely love it. It was a Michigan truck and therefore, has some minor rust. Either the dealer or the last owner did some bondo repair to the truck bed which I can’t live with. I’m thinking about cutting out the spots with a thin cut wheel and then treating everything with Ospho. Then re-spraying and then patching in with metal which I will most probably rivet. I will ultimately be putting a bedliner in the vehicle. Question? Do I need to look out for any gas lines, etc. under the bed as I know, the fuel tank is under there. For reference, I have an 8 foot bed . I’ll do my best not to cut any deeper than an inch below the bottom of the bed.

Thanks for any insight.

Richard