In my fuel supply system.  Do I just "snug it up a bit?? No tape or dope is supposed to be required on these fittings correct??  It's on the low pressure side......................the return to the fuel tank after the bypass valve/regulator.

Technically no you're not supposed to need any sort of pipe dope or sealant. I've had the same issues before. Just tightened them down a tad bit more and the leaking stopped

Snug should do it. JIC is used for high pressure systems and can take a little snugging. 

Agreed. Typically just snug them up a bit more. If still weepy then look at the cones in both fittings for damage or debris caught in between the two cones. This will cause a sealing issue and might be the cause of the weep too.