Index: firmware/App/Controllers/AirTrap.c
===================================================================
diff -u -ra4774f170562e33a48238cb3e3137bdd06ac374a -rf48a62ac25425ea9f3b49bec3ef5a538a7834a11
--- firmware/App/Controllers/AirTrap.c	(.../AirTrap.c)	(revision a4774f170562e33a48238cb3e3137bdd06ac374a)
+++ firmware/App/Controllers/AirTrap.c	(.../AirTrap.c)	(revision f48a62ac25425ea9f3b49bec3ef5a538a7834a11)
@@ -455,6 +455,8 @@
         set3WayValveState( H13_VALV, VALVE_3WAY_COMMON_TO_OPEN_STATE );   // open valve H13 to allow air to be pumped into air trap from atmosphere
         airTrapAirPumpLowerPowerLevel.data = getCalculatedAirPumpDutyCycle();
         setAirPumpState( AIR_PUMP_STATE_ON, getAirPumpLowerPowerLevel() );
+        // adjust the air trap lower delay start time after fill complete
+        airTrapLowerDelayStartTime = u32DiffWithWrap( AIR_PUMP_ON_DELAY_ADJUST_AFTER_FILL, getMSTimerCount() );
         airTrapLowerStartTime = getMSTimerCount();
         signalInitiatePressureStabilization( USE_SHORT_STABILIZATION_PERIOD );
         SEND_EVENT_WITH_2_U32_DATA( TD_EVENT_AIR_TRAP_LOWER, ON, 0 );