Knowing the year and model might be helpful. There are many threads here about tanks not draining, only to find out that there is a third handle hidden somewhere, depending on the model. The biggest culprit I can think of is the on the frame up under a slideout and behind and/or above the wheels. And it is black on black and hard to see. Mine is one of these. But they have been found in other locations also.
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2014 Raptor RP300MP w/ Rear Patio Party Deck, Folding Side Ladder, 6 Point Level Up, Carlisle Radial Trail HDs
2004 2500HD D/A CC SB - TTT Mirrors, Prodigy BC, 18K Pullrite Superglide, NEW Fuel Injectors 11/2015 (ouch)
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