loft to cylinder....will not fillet

im trying to modle an end tank to an intercooler. It needs to be as smooth and flowing as possible. im happy with the main body of the part but i need a nice fillet between the body and the outlet tube. solidworks will not do it at all. i belive this is because the back of the tube is flush with the bottom of the tank. i have tryed turning off tangent propigation but it still will not do it. Any suggestions? im still a novice at this program and im the only one with any training on solidworks so im pretty much on my own here.

here is a screen shot with the edge highlighted that i want to fillet.

thanks

M. Lee

SolidworksParts And Features