My 2015 Ace 29.3 doesnt have a filter other than the filter that is right before the pump. Certainly unscrew it and clean as it will be full of tank plastic drillings. The line drops down in the bay right behind the propane bay and runs across the rv to the pump.
PS: If you have the outdoor kitchen dont forget to drain those lines. You will have to access them under the counter top.
2015 Thor A.C.E. 29.3
2014 Honda CRV Toad
Ohio FMCA 317123
Camping World Indianapolis, worst dealer EVER experienced