I have a 78 alfa spider that I replaced the short piece of hose in the fuel tank at the tank sending unit. since that time I have been getting gas fumes, increasingly worse, in the passenger compartment, didn't smell a thing before that! I went back and resealed the sending unit/pump and am absolutely positive that it is sealed. the filler hose appears completely intact I can find no gross leaks/wetness any where. At times the fumes are overwhelming even with the top down. I really don't want to pull the tank Any ideas??