Index: firmware/App/Controllers/SpentChamberFill.c
===================================================================
diff -u -rd210786d6c7d75bb0b4d9e18efc40a01d85123fe -r173453569b2eb31b3f19572bf5386440667b0162
--- firmware/App/Controllers/SpentChamberFill.c	(.../SpentChamberFill.c)	(revision d210786d6c7d75bb0b4d9e18efc40a01d85123fe)
+++ firmware/App/Controllers/SpentChamberFill.c	(.../SpentChamberFill.c)	(revision 173453569b2eb31b3f19572bf5386440667b0162)
@@ -53,6 +53,7 @@
 
 // ********** private function prototypes **********
 
+static SPENT_CHAMBER_FILL_EXEC_STATE_T handleSpentChamberFillWaitPressureStabilizeState( void );
 static SPENT_CHAMBER_FILL_EXEC_STATE_T handleSpentChamberFillState1FillStart( void );
 static SPENT_CHAMBER_FILL_EXEC_STATE_T handleSpentChamberState1DosingControl( void );
 static SPENT_CHAMBER_FILL_EXEC_STATE_T handleSpentChamberFillState1FillEnd(void);
@@ -118,9 +119,13 @@
     switch ( spentChamberFillExecState )
     {
         case SPENT_CHAMBER_FILL_STATE_START:
-            spentChamberFillExecState = SPENT_CHAMBER_FILL_STATE1_FILL_START;
+            spentChamberFillExecState = SPENT_CHAMBER_FILL_WAIT_PRESSURE_STABILIZE_STATE;
             break;
 
+        case SPENT_CHAMBER_FILL_WAIT_PRESSURE_STABILIZE_STATE:
+            spentChamberFillExecState = handleSpentChamberFillWaitPressureStabilizeState();
+            break;
+
         case SPENT_CHAMBER_FILL_STATE1_FILL_START:
             spentChamberFillExecState = handleSpentChamberFillState1FillStart();
             break;
@@ -182,6 +187,33 @@
 
 /*********************************************************************//**
  * @brief
+ * The handleSpentChamberFillWaitPressureStabilizeState  function introduces the pressure
+ * stabilization period before starting the spent chamber fill
+ * for state 2 fill process.
+ * @details \b Inputs: none
+ * @details \b Outputs: valve states
+ * @return none.
+ *************************************************************************/
+static SPENT_CHAMBER_FILL_EXEC_STATE_T handleSpentChamberFillWaitPressureStabilizeState(  void )
+{
+    SPENT_CHAMBER_FILL_EXEC_STATE_T nextState = SPENT_CHAMBER_FILL_WAIT_PRESSURE_STABILIZE_STATE;
+
+    F32 freshDialPressure = getFilteredPressure( D18_PRES );
+    F32 spentDialPressure = getFilteredPressure( D51_PRES );
+
+    BOOL spentInRange =  ( ( spentDialPressure >= SPENT_DIAL_FILL_PRESSURE_MIN_PSIG ) && ( spentDialPressure <= SPENT_DIAL_FILL_PRESSURE_MAX_PSIG ) );
+    BOOL freshInRange =     ( ( freshDialPressure >= FRESH_DIAL_FILL_PRESSURE_MIN_PSIG ) && ( freshDialPressure <= FRESH_DIAL_FILL_PRESSURE_MAX_PSIG ) );
+
+    if ( ( TRUE == spentInRange  )  && ( TRUE == freshInRange )  )
+    {
+        nextState = SPENT_CHAMBER_FILL_STATE1_FILL_START;
+    }
+
+    return nextState;
+}
+
+/*********************************************************************//**
+ * @brief
  * The valveControlForSCFillState2FillStart function actuates the valve combination
  * for state 2 fill process.
  * @details \b Inputs: none
@@ -255,7 +287,6 @@
 static SPENT_CHAMBER_FILL_EXEC_STATE_T handleSpentChamberState1DosingControl( void )
 {
     SPENT_CHAMBER_FILL_EXEC_STATE_T state = SPENT_CHAMBER_FILL_STATE1_DOSING_CNTRL;
-
     // On dosing completion, transition to next state
     if ( ( TRUE == isConcentratePumpDosingCompleted( D11_PUMP ) ) &&
          ( TRUE == isConcentratePumpDosingCompleted( D10_PUMP ) ) )