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would it be possible to unscrew the quick connect fitting SLOWLY until water starts to drip out of threads thus allowing the pressure to drop down slowly to the point of being able to release the hose coupler?
Your manual will say to use General pump oil GP100..or whatever DeWalt's number for that may be. See dewalt.com for their proper part number. From the pictures of that model I see on line, that is a General Pump and they have recommended Non-detergent 30w standard motor oil in the past. We like to use a non-foaming full synthetic 20-50w racing oil on these high RPM pumps.
Check the bottom of the gas tank for dirt/debris and the float bowl for the same, if it has a fuel filter check that also. Sometimes, if there is debris in any of these places it will settle down when the gas flow is stopped. Then, depending on how the machine is being used or moved around while it is running, the debris will slowly be pulled into the gas flow until it creats a blockage and starves the motor of fuel. When the motor dies the debris settles back down in the tank/float bowl and the motor will start again. Clean out anything in the tank and float bowl and replace the fuel filter if it has one.
Had a similar issue with my dewalt 4200 pw. Unit starting shutting off after spraying for about 5 min. Then difficult to restart, but would start again eventually only to shut down a few min later. Had new engine oil, new pump oil, good gas. I changed the spark plug and unit runs great again!
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