That s not necessarily true.
Excell pressure washer unloader valve location.
If your pressure washer is not building pressure and the engine is surging there could be a few different causes.
One of them is a sticking unloader valve.
Excell vr2500 devilbiss a01703 pump one day just stopped producing pressure.
Usually this pressure setting is higher than the system pressure while you are spraying.
The unloader only relieves the pressure once it reaches a certain p s i.
If the pressure washer unloader valve isn t working replace it using the manufacturer approved replacement part.
When your pressure washer has its pressure gun depressed the unloader valve ensures the flow of water towards the nozzle.
The system pressure depends on the setting of the unloader.
For example if your washer produces 1000 psi while you are spraying the unloader should not unload until the pressure exceeds the 1000psi.
The unloader valve kit includes the o ring and all parts needed for the repair.
Troubleshooting shows that it s likely the unloader valve.
If the unloader valve clogs or won t open the thermal release valve opens and sprays steamy water from the pump.
Only a mild pour would come out when engaged and engine and all runs fine.
Many videos write ups show that you can try to free a stuck pin to repair it.