Thanks guys. Yes, I’ve read about the line from the primary filter to the transfer pump. That’s on my list to change. The line I’m referring to connects to the tank outlet at front of coach and runs down the frame rail to the back. I’m assuming this is the supply line to the primary filter, I know the smaller line in my picture is the return line to the tank. I don’t know what the bigger line is with the pipe fitting. I’m guessing that is the vent line.
My leak is in that middle line (supply/suction?) about 8 inches from the fitting, before it disappears in to the frame rail. My question is, can I cut out the pinhole leak and join the two ends with a barbed coupling connector and hose clamps? If this is the supply line, would it be 1/2” ID? Them if that is the fix, would I just be able to start the engine and it will bleed off the air in the line by itself, or will there be a procedure for that.
As an aside, my primary filter does not have any black particles in the sight tube so I’m assuming the integrity of the hose is intact, at least for now. I may change over to the CAT primary filter set up at the same time, but I need to make sure I solve one problem at a time, as not to confuse the issues.
Thank you.