Yele Car Wash & Tire Lube

I have a 4 bay ss with Mark VI equipment, and running Cat 310 pumps. Yesterday afternoon I had someone washing in my bay 4 and everything was running fine and they were using high pressure rinse, soap, and everything else.

Today, when I arrived at the bay to clean it, I turned on the bay, turned it to high pressure rinse and it sprayed hard for about 3 seconds and then I felt the gun chattering, and then the water just dropped to a small drizzle. I checked the high pressure soap, wax, tire cleaner, presoak, etc and they all worked at the correct pressure levels. I also tested that when...