It's probably plugged with construction debris. Can try snaking it. May have to take it apart to fix. Also it could be partly blocked by excessive glue.
2017 Eagle 293RKDS, factory ordered, lots of mods and upgrades. More than I can list.
2018 Ram 3500 crew cab long bed SRW diesel 6spd Aisin 4wd Tradesman.
B&W Ram puck 5th wheel
Mopar wheel to wheel steps