We just had ours in for a similar situation. The fill tube had a split where it passed through a wall. They spliced in a section using a barbed inside coupling and hose clamps. The fitting came from an 1-1/4" irrigation application.
It could very well be a vent issue also , just dig-in and look for the source.
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TT- 2016 Grey Wolf 21RB
TV- 2004 GMC3500 4x
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