Grease gun with pump prime indicator

A grease dispensing device comprising:

• a housing,
• grease passaging supported by the housing, the grease passaging including a grease inlet for receiving grease from a supply of grease, and the grease passaging including a grease dispensing outlet for dispensing grease from the grease dispensing device,
• a grease drive system arranged with respect to the grease passaging to move grease through the grease passaging toward the grease dispensing outlet,
• a sensor supported by the housing and arranged to sense grease in the grease passaging and to generate sensor data related thereto,
• a user interface comprising a prime indicator, the prime indicator configured to change between at least first and second states based on the sensor data, the prime indicator in the first state representing the grease dispensing device is primed with grease, the prime indicator in the second state representing the grease dispensing device is not primed with grease, and
• a grease controller and a tangible storage medium storing instructions executable by the grease controller, the grease controller operatively connected to the sensor for monitoring the sensor data to determine whether the grease dispensing device is primed with grease, the grease controller operatively connected to the prime indicator for controlling operation of the prime indicator, the tangible storage medium storing grease controller executable instructions to change the state of the prime indicator based on the sensor data, said instructions including delay instructions to delay changing the prime indicator from the first state to the second state for a delay period after the controller determines the grease dispensing device is not primed with grease.