We've seen it all too often, you change the injectors in your Common Rail Cummins equipped Ram, you bleed the injector lines, you take all of the right steps, but still end up with a hard start and rough idle. Guess what, nine times out of ten its because you didn't replace the connector tubes when you should have. There are very few instances in which you can replace an injector and NOT replace the tube. And if you're unsure what a connector tube even is, basically its a tube that connects the injector line on the outside of the head to the injector on the inside of the head, running laterally, perpendicular to the injector itself. It feeds into the side of the injector, which features a small simple to allow the tube to seat into the side. In most instances, the original tube has a wear ring where it met the old injector that simply doesn't seat the same with the new injector installed, causing a fuel leak into the cylinder.