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Ok, not a problem there, or even on the supply line to CTIS from the wet tank. that might slow the speed it can fill the tires though. You just cant put any restrictions between the wheel valves and where the PCU vents thru the floor, otherwise it might not stop dumping when it is commanded to…

Where/how exactly is this installed? Is that the fitting on the end of the stem feeding air into the wheel? If so that wont be an issue. There should already be a filter at the other end of that line where it attaches to the small port on the wheel valve. the issue, like the OPs problem...

the dump valves do not feed back very much air toward the PCU. 99+% of the air coming from the tire/hub would exit thru the dump vent... I don't see that little bit of flow carrying much from dump to PCU... I don't think CTIS can work well with anything in the line as it would have to be able...

Wow, a syntered bronze filter... thats weird and should not be there. the only filter in ctis should be between the wheel valve and the tire. This system relies on proper flow to allow the pressure changes that control/close the wheel valves promptly... that filter should not be there or in...

If you disconnect the line to that wheel AT the dump valve beside the transmission, you should be able to blow air into the tire thru the hoses and hub just like CTIS does using a blow gun. when you remove the blowgun the line should vent briefly as the pressure drop closes the wheel valve… if...

Ok. I think i understand. Anytime the truck side of the wheel valve has more than ~5PSI on it, the wheel valve is open. When CTIS finishes a cycle, it vents to atmosphere and the presdure drop below 5 at the wheel valves closes them. This sounds like you have a restriction on that one wheel...

Please clarify what "constantly pumping air to the front passenger tire" means. CTIS PCU has a single output that feeds all tires simultaneously, via a dump vslve for each axle. The dump valve feeds both tires on its axle equally...