Index: leahi_dialin/dd/modules/piston_pump.py
===================================================================
diff -u -rdfbb4f080638b65d9836b22bd5c76d46d53abba5 -rfdbc8e289849262ab4ceeb34d87d3e9a4420d820
--- leahi_dialin/dd/modules/piston_pump.py	(.../piston_pump.py)	(revision dfbb4f080638b65d9836b22bd5c76d46d53abba5)
+++ leahi_dialin/dd/modules/piston_pump.py	(.../piston_pump.py)	(revision fdbc8e289849262ab4ceeb34d87d3e9a4420d820)
@@ -168,4 +168,36 @@
             return received_message['message'][DenaliMessage.PAYLOAD_START_INDEX]
         else:
             self.logger.error("Timeout!!!!")
+            return False
+
+    def cmd_piston_pump_fill_after_dispense_override(self, fill: bool, reset: int = NO_RESET) -> int:
+        """
+        Constructs and sends the piston pump fill after dispense override command
+        Constraints:
+            Must be logged into DD.
+
+        @param fill:  integer - 0 = false, 1 = true to override piston pump fill
+        @param reset:  integer - 1 to reset a previous override, 0 to override
+        @return: 1 if successful, zero otherwise
+        """
+
+        reset_byte_array = integer_to_bytearray(reset)
+        fl = integer_to_bytearray(fill)
+        payload = reset_byte_array + fl
+
+        message = DenaliMessage.build_message(channel_id=DenaliChannels.dialin_to_dd_ch_id,
+                                              message_id=MsgIds.MSG_ID_DD_PISTON_PUMP_FILL_AFTER_DISPENSE_OVERRIDE_REQUEST.value,
+                                              payload=payload)
+
+        self.logger.debug("override DD piston pump fill after dispense.")
+
+        # Send message
+        received_message = self.can_interface.send(message)
+
+        # If there is content...
+        if received_message is not None:
+            # response payload is OK or not OK
+            return received_message['message'][DenaliMessage.PAYLOAD_START_INDEX]
+        else:
+            self.logger.error("Timeout!!!!")
             return False
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