Thinking further, 1) is Gray tank valve open, or handle detached, or you have two gray tanks, or two Valves for gray? (one on far side?); 2) gray tank is Full, but drain port blocked by obstacle (have even read where owners found tank cutout was not removed on tank install, and cutout circle wedged in drain, blocking drain pipe?) Luck (p.s. You don't state 5th wheel, bumper pull or Class-C MH Conquest, so style/ model matters?)
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THenne1713
2000 Conquest LE 6266, Class-C on 99-E450SD, 6.8, 2v, V-10
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