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Not trying to be funny but this thread is better than a Netflix series I can't wait to hear what's in the check valve. I would disconnect the line on both ends and get a bottle of nitrogen and put a couple hundred pound of pressure and see if it blow something out.

Thanks Jack, I am glad we are entertaining someone.. haha! 

So I blew through the check valve with my air compressor several times, at 150psi, so I would have thought that would do it. There is something strange going on on the check valve. You could tell it was going through it because the air was making a pulsing sound as it went through the check valve. So that is how I decided to condemn the check valve. I really wanted to get it out and take it apart to see what was going on inside. Like Richard said, if you could get some solvent or something in there I bet it would clean it out.

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Aqua Hot definitely has a return fuel line.

Thanks Rudy!