Re: CJ gas tank install????
There are two lines that attach to the tank on the left side. One is from the return line on the fuel filter and the other is from the charcoal cannister. As for the cannisters in the fender well, one of them is the rollover valve that blocks fuel from running out of the tank should your jeep go wheels up, the other is called a liquid check valve in th FSM. It allows vapors to reach the charcoal cannister but blocks liquid fuel from getting to it. I don't have a rollover valve on mine because it rotted away and I couldn't find a replacement. I guess the short story is that you don't "need" either one of these valves, but they may be nice to have in some situations.