Official Coleman gas pressure washer parts

What to do when water sprays out of the pressure relief valve on your Coleman gas pressure washer

If the pressure washer runs for more than 5 minutes when the spray wand isn't in use, the water in the pump often overheats, causing the thermal relief valve to open and discharge hot water onto the ground. When the thermal relief valve opens, cool water enters the pump and cools the system. Once the pump has cooled, the thermal relief valve closes and the pressure washer operates normally. If the pressure relief valve purges constantly and doesn't close properly, replace it.

Troubleshooting your Coleman gas pressure washer when it produces weak spray

An insufficient water supply can cause low pressure at the nozzle. Check the water pressure at the source and the flow connected to the inlet of the pressure washer. Check the inlet screen for a clog that could be blocking inlet water flow.

Check whether a low-pressure spray tip is installed on the wand; if so, install a different nozzle. A problem with the wand or pressure hose can also cause low nozzle pressure. Clean or replace the wand if necessary. Replace the pressure hose if it's clogged.

A pump failure can cause low nozzle pressure. Replace the pump check valves or replace the entire pump if it doesn't build up adequate spray pressure. A stuck unloader valve can also cause low pressure at the nozzle. Replace the unloader valve if it sticks open and constantly recirculates water back to the pump inlet.