Was watching the sight glass last night while boiling,started off higher than I prefer,then when things really got rolling noticed the sap was only 1/4” above the flues. Went and held down on the float thinking I might have to do some adjustments,but there would be no reason for that. Sap was coming in from steam away,but maybe not as fast as it should. Got maybe 1/2” above crimps,then fired again and level getting dangerously close to top of crimps. Held down on the float for the duration of that fire,temperature of sap from steam away was 192, got down to about 186, then seemed to be okay rest of the boil. One good thing is that it was first boil and no syrup drawing off ,or could have been some mad scrambling