Sounds like the pump is cavitating due to the suction tube not going all the way to the bottom of the tank. I would either install a longer piece of suction tubing ensuring it goes all the way to the bottom of the tank OR cut a tee into the tank low point drain and draw off that. My fresh water tank has a hose barb at the low point with a 1/2" tygon tube running to one of those cheap white plastic spigots mounted to the frame rail for draining the tank. Tee into that.
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2006 23B Hybrid with 10k round bar WDH
2011 F150 4x4 SCREW Ecoboost, Max Tow, Integrated TBC, 3.73 LS axle, Firestone Ride Rite airbags.
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