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Sounds like a bad check valve or hooked up wrong the soap should siphon in could valve fitting be in backwards, or in wrong place I use a separate siphon valve that fits between pump out let and high pressure hose.
if your pressure is satisfactory then you will need to replace the thermal relief you can plug the port as long as the pump is unloading fine when trigger is released an get a replacement asap thermal relief valve will open when the gun is released for a long duration of time over three minutes.detergent valve inside the barb you may have to assist the ball bearing inside it might be stuck to the o-ring and the siphon it produces is not sufficient enough to cause separation.you can insert a nail small enough and slowly insert it inside the port til you feel it separate.
chemical injector activates only when low pressure is utilized try this remove hose from triggergun assembly with the water turned on engine off allow water to free flow out of hose remove the chemical hose from the barb located at pump with a paperclip or needle insert it into the hole of barb and slowly separate the ball inside the barb you should here it siphon and try not to look directly at the port you may get sprayed once freed reinstall all back together and try again.;0;0
The most common cause of this is the pressure regulating spool valve sticks in the bore. As the pressure builds with the wand closed, the spool moves against a spring to block additional water from entering. When wand is triggered, pressure drops and more water is admitted. Remove the spool and clean the bore with crocus cloth on a dowel rod. Replace the O Rings on the spool and lube with a bit of plumber's grease and re-assemble. Often you can get a kit of O Rings for the washer or you can get EXACT replacements at a supplier... they MUST be the exact size as the originals.
The real question is where exactly is the leak coming from. Compressors have a pressure release valve designed to let the pressure off of the compressor motor so it can start when there is pressure in the tank. This valve is often the culprit and fairly easy to replace. You can order it direct from porter-cable online. Just in case double check the drain petcock sometimes these get worn and won't close completely and can easily be over looked when trouble shooting.
check your in take screen make sure its not plugged, look for calciumbuild up. then check your valve there should be six of them. my be damaged or weiring out and or plunged. if all looks good you'll need to check your unload-er valve. check your oil to make sure no water is in there, ok. good luck, let me know.