welcome to the forum. Reference your gray tank issue, guages are tranditionally unreliable, but gray usually more dependable than black. I would double check to see if the valve is really open. The pull handle may be out, but disconnected from the valve.
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Mike and Lorraine
2002 3655 FL, 2005 3650RK
2010 3665RE, 2015 3910FB
F350 crew cab dually 6.7
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