Lee Smith Posted September 3, 2022 Share Posted September 3, 2022 My recently purchased 2004 Signature had a water leak onto the Aqua-Hot bay floor that originated where the domestic water supply lines connect to the boiler. I have been busy with many other things and finally got to this one. When I purchased the coach last April in Canada, I tested the Aqua Hot and noticed a brief period of white smoke and a small leak of domestic water. I saw that the system was plumbed with pex piping so I was not worried about fixing it when I got back to Virginia. Sure enough, the hot water domestic supply line from the boiler to the coach fixtures had a bad fitting. I replaced the fitting, and the leak was cured. Then when I started the system up, white smoke billowed out without stopping. I found a bad connection from the fuel filter to the coach diesel tank. I redid the connection, and the white smoke was nearly eliminated. My wife noticed air bubbles in the clear bowl of the Racor R12T fuel filter. There was an adjustment screw on the bottom of the bowl, so I turned it in slightly (which was all of the adjustment available). That reduced the air bubbles substantially but there was still a steady stream of small bubbles. The white smoke disappeared completely, and the boiler system now works without any flaws. My questions: Are the air bubbles part of the makeup air to prevent a vacuum lock in the fuel filter? If so, then what may or may not be the correct adjustment? Here are pictures: Additionally, I noticed that the interior surface of the fuel line was smooth for a short distance where it connected to the coach fuel tank. I have never seen that before and I am curious as to what others may think. Here is a picture of the piece I removed to fix the connection: Thank you very much for your time, Lee Smith Link to comment Share on other sites More sharing options...
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