proper air flow into the combustion chamber is a big part of making these things work right. i had to adjust the air mixture on mine. they have to be "under load" when bench testing them, meaning they cant be totally open and have to have all the tubing attached they have the same airflow dynamics that would be in the coach. makes a big difference. i learned that from talking to an old timer that has worked on these things for years.
that is why sometimes the screens can cause problems. not usually, but it is possible.
later
tom
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