Posted by Chris Case [172.68.46.32] on Friday, September 28, 2018 at 09:04:00 :
In Reply to: noisy helitool ps pump posted by mannyc [173.245.52.100] on Thursday, September 27, 2018 at 20:40:02 :
The noise is from the pressure relief valve.Easily accessible under the hood. Stretch the spring, or add in a shim (washer) just to see.