Patent ID: 8727233

Claim:
An apparatus for supplying pressurized fluid to a high pressure washing device for use with a spray gun having a trigger which starts fluid flow regardless of the fluid pressure, the spray gun connected to a high pressure hose, the apparatus comprising: an internal combustion engine in driving communication with a fluid pump having a fluid inlet and fluid outlet, the engine having a shut-off switch having a run position and no-run position; an outlet coupling in fluid communication with the pump outlet, the outlet coupling being configured to connect to the hose; an inlet coupling configured to connect to a fluid source and in fluid communication with the inlet of the pump, the pump receiving fluid from the inlet coupling and providing high pressure pressurized-fluid between 1,000 and about 6,000 psi to the outlet coupling when driven by the engine; a sensor located at or between the inlet coupling and outlet coupling of the high pressure washing device and configured to provide a flow start indication in response to a fluid flow at the location of the sensor reflecting the start of fluid flow at the sensor in response actuation of the trigger even when the inlet coupling is in fluid communication with a fluid source without the engine running, the sensor further configured to provide a flow stop indication in response to a change in flow at the location of the sensor reflecting the stoppage of fluid flow at the sensor; an electronic control module having a timer to determine the passage of a predetermined amount of time, the module configured to start the timer to measure the predetermined amount of time in response to a flow stop indication of the sensor, the control module being configured to turn off the engine if the sensor does not provide a flow start indication before the predetermined amount of time has elapsed, the module configured to reset the timer with each flow start indication.