gas tank

I just bought a 93 s10 and it has a fuel issue. I'm pretty sure its bad gas because it's been sitting there for a year or longer and i want to empty the gas tank. I pulled the bed off but now i can't seem to find out how to take the fuel pump lines off. The fourth line doesnt have a screw or...

I just bought a 93 s10 and it has a fuel issue. I'm pretty sure its bad gas because it's been sitting there for a year or longer and i want to empty the gas tank. I pulled the bed off but now i can't seem to find out how to take the fuel pump lines off. The fourth line doesnt have a screw or...