Originally Posted by RLFarrell
As a newbie I was filling my fresh water tank for my first trip today and it started overflowing which obvious told me the tank was full. I shut the water off and it kept overflowing. When it finally stopped I check the gauge in the coach and it said the tank was only 2/3 full. What am I doing wrong or is this supposed to happen? It was on relatively level ground.
Thanks for your help.
Your not doing anything wrong, just finding out what so many of us have found out. FR does a really poor job of routing the vent hoses on many of their rigs. Since they hang lower than the tank in most cases it creates a siphon. There are several threads here on the subject. The easy fix is to put a garden hose ball valve on the end of the vent tube and close it when you are done filling then open it when you get where you are going, or re run the vent tube if you can. You may have to blow the water back into the tank to stop the siphon once you open the vent valve too. See this thread
for a long discussion on the issue.