Smelling gas really bad in and out of vehicle for last couple days

I have been smelling gas inside the cab of the jimmy really bad for past couple days. I smell the gas both in and out of the vehicle on the drivers side. I have also noticed my fuel guage bouncing from full to empty causing my low fuel light to come on. I have checked for fuel leaks but am not able to see any on ground or visible to my eyes. I do know that both O2 sensors in front of catalytic converter and behind catalytic converter are out along with a few different vaccuum leaks.