It helps if you tell us what year and model RV you have. But most Montanas use a solid pull rod (rather than a cable) to operate the gate valve on the tank. They are pretty foolproof. It sounds like you have a valve problem (as in it is not opening). Pouring chemicals down the drain is worthless. You need to gain access to the valve and determine why it is not opening.
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Carl (n Susan)
There is more to life than fuel mileage.
2012 Montana 3700RL Big Sky Package towed by a 2015 Ford F350 6.7L PSD 4WD CC LWB
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