Do you have two tanks ? grey and galley tanks ? Both drained ?. If you have two. Anything gone down the drain that would clog it? Need a little more info.
While we wait for the make/model, if it's a new to you rig, I'm willing to bet you have another pull handle that is hard to see/find. Check up by the frame around the tires- some of them are really stupidly placed.
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Officially a SOB with a 2022 Jayco Precept 36C
Checkout my site for RVing tips, tricks, and info | Was a Fulltime Family for 5 years, now we're part-timing on long trips
Look under the sink. You may have to remove some panels. We found our sink drain line to have a 180 degree bend in it that basically plugged the hose. Had a u shaped pvc hose inserted to take out the kink. Bad design and installation at the factory.
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