The process for adjusting the water output of a gasoline high-pressure cleaner will depend on the specific model and make of the equipment. However, here are some general steps that you can follow:

Refer to the user manual: The first step is to refer to the user manual that came with the gasoline high-pressure cleaner. The manual should contain information about adjusting the water output and may provide specific instructions for your particular model.

Check the nozzle size: The size of the nozzle can affect the water output of the high-pressure cleaner. If the nozzle is too small, it will increase the pressure and decrease the flow rate of the water. Conversely, if the nozzle is too large, it will decrease the pressure and increase the flow rate of the water. Check the nozzle size and replace it if necessary.

Adjust the pressure regulator: Many high-pressure cleaners come with a pressure regulator that allows you to adjust the pressure of the water output. You can turn the pressure regulator knob to increase or decrease the pressure of the water output.

Adjust the engine throttle: Some gasoline high-pressure cleaners may have an engine throttle that can be adjusted to control the water output. You can adjust the throttle to increase or decrease the engine speed, which will affect the water output.

Use the correct detergent: Using the correct detergent can also affect the water output of the high-pressure cleaner. Make sure that you are using the correct detergent for your particular model and follow the manufacturer's instructions for dilution rates.