You should have an access panel in the cargo area to get at the sender/pump plate. Use flare nut wrenches on the fuel line. Get a new gasket for the sender plate, and swap the fuel pump over to the new assy.

I think you have an injector stuck open. Check plugs for one that's sooty looking. Seafoam in the gas tank may help free it up, or a pint of acetone.

Not responsible for advice not taken...