First I want to thank the posters who informed me that there was a valve on the LP tank where the bleeder line is connected. Today decided to work on it and crawled underneath and found the valve on the side of the LP tank. Rather than tear it apart I decided to completely close the valve and fully open it all of the way. I then went and checked the bleeder by the fill fitting and presto it's working again. The old lesson came back to always do the simple things first. This on a Discovery that has the LP tank towards the front middle with the fill in the rear side.