What code number lead you to think pressure sensor is bad?
Could be loose, or failed, gas cap, cracked filler/vent tube, EVAP vacuum issue.
It sits on top of tank in the fuel pump access ring, 3 wire connector has been know to get moisture inside causing out of range codes.
Yes raising and sliding back bed is best way to get to this sensor and fuel pump.
Inspect leaf spring hangers when bed is off, these tend to rust out, also filler tube for cracks