Here is a photo of my present setup. The dawg gone fuel line turned out so nice I couldn't bring myself to reroute it again for the heater hose, so I tapped into the second water outlet on the pump. I thought that would solve my heater problem. You are probably right... I must have no flow to the heater with it set up as is.
http://www.flickr.com/photos/diesel-...in/photostream
http://www.flickr.com/photos/diesel-...in/photostream