We have a 1997 Rockwood. The original stove works fine. We are wanting to use a "Coleman" stove as a backup. I have the correct hose for the stove. A quick connect. There is not enough pressure to keep the "Coleman" stove lit. If the original stove works, am I looking at a possible pressure issue or clogged line? There is a hookup outside and inside and both do not have enough pressure to keep it lit. There is a regulator at the tank. Any info would be appreciated.