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With Randy’s great advice, I was able to fix the pulsating issue by replacing my water regulator. Thank you Randy and others that posted.

Cat pumps 310S using city water. Gravity fed chemicals from hydrominer tanks.

Upstream/downstream - I suppose it depends on how you reference it. But you are correct. I have the city water line coming into that regulator then it hits the "check valve" then to the pump. This set up works on 3 other bays but for some odd reason after rebuilding the pump and fixing an...

You're the second person that thinks that's a check valve but I'm unable to find anything that large for a replacement. The regulator is on the downstream side.

The check valves that I have on the soap/wax have a cracking pressure of 1 PSI. I've taken those valve off of the pump and tested the kip valve and chemicals came out of the check valves. https://www.kleen-ritecorp.com/p-1737-kleen-rite-check-valves-1-4mxm.aspx

High pressure chemicals (soap and wax) are not coming out of the spray gun. Both are gravity fed, mixture in the hydrominer is good since the other 3 bays are working correctly. Prior to this issue the pump was getting starved of inlet water because of electrical issues but chemicals were...