I broke it when lowering the tank because if you don't know it's there, the manual never mentions it (oops). My problem is not that ( i don't think), but I do think you need to replace it, seeing as how without it, the fuel system will not keep pressure. Also you will have fuel spewing out when you crank it up, because that fuel return line is open. I figured out the system wasn't holding pressure because I could start the truck with starter fluid, and the truck would run, but let it sit for 15 minutes or so, and no start... Means the pressure wasn't staying. I knew this was broken so it had to be the problem.