Why is the grey tank on my Trek3 always showing 1 bar, even though it is empty? Setec Customer Support June 30, 2025 06:10 The grey tank will always show 1 bar as it will flash when full, as it works in reverse to the clean tanks. Related articles My fresh/grey/black water tanks are always reading incorrectly in my BMPRO Connect system. What can I do? I can't operate water pump 2 or get into Set-Up mode on my Trek. What can I do? My water tanks are not being read correctly on my Trek. What do I do? Is the Fastway E2 weight distribution kit compatible with the SwayControl? Is the Hayman and Reese Guardian IQ brake controller compatible with the SwayControl?