I too had a problem with post fueling leakage. When at Newmar a few months after getting our rig I picked up a couple of new fuel caps and they solved the problem. Then, roll forward a little more than a year and the passenger side started leaking when full again. I then purchased a non-vented cap, figuring a vent on one side was sufficient and it stopped the leak and its been fine more for the past several months. Replacement caps are cheap and most parts shops should be able to find one that matches.
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Retired and livin' the RV dream!
2005 Newmar 43 ft. MADP, Cummins ISL 400HP, 2018 Jeep Wrangler JLU Sahara
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