When you say on the "right-side next to the tank" are you referring to gas tank. If so, that would make it near the filler neck? No?
If that's where it is, check the cap to make sure it is seated tight enough. Make sure that you or a previous owner wasn't manipulating the cap with the set screw still in it, that could booger the filler neck up.
I have found previous if the cap isn't sealing right, it will "spittle" a bit.
If that isn't the area it is leaking from then disregard everything I just said.
