This is what I was told by a Newell tech that it will automatically illuminate when filter is corrupted to the top or a combo of dirt and excess water at the bottom will trigger the light earlier at (7/8) full. My light did illuminate before the sight glass was full last year, even though the PDF says it can fill to the top before a change and drain is needed. The tech might have been guesstimating based on experience. The light is handy, but I always check everything on a regular basis and would change out the filter before the fuel reaches the top myself anyway.
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Larry & Hedy Brachfeld
2003 Double Slide, Detroit 60
Coach # 646
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