Something REALLY strange going on....
Archived brochure for 1997 Tour Master ((Gulf Stream Class A) lists ALL models having 150# LP tanks.
Propane weighs 4.2#/gallon......that comes out to 35.7 gallons :H
Now IF that 150# is Total Capacity then 80% Liquid Level (FULL) would be 28.5 gallons.
Propane should continue to flow until tank is empty.
Liquid turns to vapor....vapor comes out of service valve....LP Reg maintains 11"WC (0.4 psi) on system until NO Vapor
Propane Tank Components (left to right)
Magnetic roller float....liquid level gage
Relief valve stand tube....in vapor zone
Fill Valve float......stops filling at 80% liquid level
Bleeder Valve stand tube...set at 80% liquid level
Service Valve stand tube...in vapor zone
Gulf Stream Archival1997 Tour Master BrochurePossible issues......... (like 'rctour' suggested)
Fill valve float set at 15 gallons vs 25+ gallons and stops filling then tank goes empty when 15 gallons is used....no more vapor (nothing to prevent vapor flow thru service valve except EMPTY tank)