Water Cannon have the solution :

This problem was most likely caused by any of following:

Freezing - Always drain the excess water if there is a possiblity of a freeze

Try using our Pump Saver product

Cavitation (low water or no water Condition) - Increase the size of the garden hose

Try using a 5 gallon bucket to test the water supply - Always avoid using the dish washer or washing clothes if a pressure washer is in use

  

Over Pressurization - over time bypass pressure unloader valves can be over tightened

You can test for over pressurization by installing a pressure test guage and triggering the trigger gun to se the pressure spikes

You should never be more than 10% over rated pump pressure when the trigger closes.