Index: firmware/App/Modes/Prime.c
===================================================================
diff -u -r88a641b7b0185e0bad77e21e6d438e1d7283fd28 -r9df8618dfd95d3af354e6cbb590ebe6f6fd7ccdd
--- firmware/App/Modes/Prime.c	(.../Prime.c)	(revision 88a641b7b0185e0bad77e21e6d438e1d7283fd28)
+++ firmware/App/Modes/Prime.c	(.../Prime.c)	(revision 9df8618dfd95d3af354e6cbb590ebe6f6fd7ccdd)
@@ -40,7 +40,7 @@
 #define LOAD_CELL_VOLUME_NOISE_TOLERANCE        0.05                                                ///< Allow 5% tolerance on load cell readings.
 
 #define PRIME_DRAIN_RESERVOIR_TO_VOLUME_ML      100                                                 ///< Drain reservoir to this volume (in mL) during prime.
-#define PRIME_FILL_RESERVOIR_TO_VOLUME_ML       1700                                                ///< Fill reservoir to this volume (in mL) during prime.
+#define PRIME_FILL_RESERVOIR_TO_VOLUME_ML       ( FILL_RESERVOIR_TO_VOLUME_ML / 2 )                 ///< Fill reservoir to this volume (in mL) during prime.
 
 #define NO_AIR_DETECTED_COUNT                   ( 10 * MS_PER_SECOND )                              ///< No air detected time period count.
 #define PURGE_AIR_TIME_OUT_COUNT                ( 30 * MS_PER_SECOND )                              ///< Time period count for purge air time out.