Index: firmware/App/Drivers/GLXferPump.c
===================================================================
diff -u -r930bd81e14c0107cfe3f862d9a9cf87d9dadf84a -rf267032333f872d729d33614f48373eeb6c422d2
--- firmware/App/Drivers/GLXferPump.c	(.../GLXferPump.c)	(revision 930bd81e14c0107cfe3f862d9a9cf87d9dadf84a)
+++ firmware/App/Drivers/GLXferPump.c	(.../GLXferPump.c)	(revision f267032333f872d729d33614f48373eeb6c422d2)
@@ -29,13 +29,17 @@
 // ********** private definitions **********
 
 #define AIR_PUMP_PWM_TIME           20                ///< Time (in 10ns increments) per PWM register count for the air pump = 20 kHz.
+#define AIR_PUMP_MAX_PWM            255.0f            ///< Air pump maximum PWM.
+#define AIR_PUMP_PWM_PCT            100.0f            ///< Air pump pwm percentage
 
 // ********** private data **********
 
-static U08 currentAirPumpMotorPowerLevel;             ///< Current air pump motor state: 0=off, 1..255=power level.
+static F32 currentAirPumpMotorPowerLevel;             ///< Current air pump motor state: 0=off, 1..255=power level.
 
 // ********** private function prototypes **********
 
+static U08 PercentageToScalar(F32 percentage);
+
 /*********************************************************************//**
  * @brief
  * The initGasLiqXferPumpDriver function initializes the gas/liquid transfer
@@ -58,16 +62,16 @@
  * @details \b Message \b Sent: MSG_ID_TD_EVENT if changing air pump power level.
  * @details \b Inputs: none
  * @details \b Outputs: currentAirPumpMotorPowerLevel
- * @param power Power level for air pump (0=off, 1..255=lower to higher power level).
+ * @param power Power level for air pump (0..2=off, 3..100=lower to higher power level).
  * @return none.
  *************************************************************************/
-void setAirPumpMotorPower( U08 power )
+void setAirPumpMotorPower( F32 power )
 {
     // if state is changing, set the air pump to the given on/off state and send event
     if ( power != currentAirPumpMotorPowerLevel )
     {
-        SEND_EVENT_WITH_2_U32_DATA( TD_EVENT_AIR_PUMP_ON_OFF, (U32)currentAirPumpMotorPowerLevel, (U32)power );
-        setH12AirPumpMotorPowerLevel( power );
+        SEND_EVENT_WITH_2_F32_DATA(TD_EVENT_AIR_PUMP_ON_OFF, currentAirPumpMotorPowerLevel, power );
+        setH12AirPumpMotorPowerLevel( PercentageToScalar( power ) );
         currentAirPumpMotorPowerLevel = power;
     }
 }
@@ -80,7 +84,7 @@
  * @details \b Outputs: none
  * @return Current set power level of the air pump motor.
  *************************************************************************/
-U08 getAirPumpMotorPower( void )
+F32 getAirPumpMotorPower( void )
 {
     return currentAirPumpMotorPowerLevel;
 }
@@ -97,7 +101,31 @@
    return getAirPumpRPM();
 }
 
+/*********************************************************************//**
+ * @brief
+ * The PercentageToScalar function convert percentage 0-100% duty
+ * cycle to 0-255 scalar value.
+ * @details \b Inputs: none
+ * @details \b Outputs: none
+ * @param percentage Power level for air pump (0...2=off, 3-100.0 for ON).
+ * @return U08 8-bit PWM value (0-255)
+ *************************************************************************/
+static U08 PercentageToScalar(F32 percentage) {
+    // Clamp input to 0-100%
+    if ( percentage < 0.0f )
+    {
+        percentage = 0.0f;
+    }
+    if ( percentage > AIR_PUMP_PWM_PCT )
+    {
+        percentage = AIR_PUMP_PWM_PCT;
+    }
 
+    // Calculate 0-255 value (255 * percent / 100)
+    return (U08)( ( ( percentage * AIR_PUMP_MAX_PWM ) / AIR_PUMP_PWM_PCT ) );
+}
+
+
 /*************************************************************************
  *                       TEST SUPPORT FUNCTIONS
  *************************************************************************/