95 blazer fuel leak

I have a 95 chevy blazer LS four wheel drive four door 4.3 liter vortec and i have a gas leak. its dripping out pretty good when its running its not coming from the sending unit and i dont think its the lines because someone told me if the lines where leaking that it wont even start because it wont have enough fuel pressure to open the injectors. it was leaking even when the tank was almost empty. I took the fuel tank off today and notice it was wet on top i just dont want to replace the fuel tank and sending unit to then have a problem with the lines. Just wondering if the lines could be bad or if there was just a small hole in the top of the tank