High Pressure Rinse stopped working overnight

[grimmy2016]

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 I run HPR that the pressure gauge is not showing more than about 200psi, but is at 1100psi for all other appropriate services.

I went into the mechanical room and checked and cleaned the check valve filter and it was clean. My rinse water is fed from the city, into a holding bay in the Mark VII system, before it goes out to the pump and bays.

I am unsure of what to check to resolve this. I did test all other bays and they all get high pressure rinse with no issues.

I am really new to car wash ownership and cant afford to keep calling out a maintenance company to resolve these types of issues. So any help or experience or suggestions is highly appreciated!

Thanks Pics of the equipment for reference.

 

[Keno]

Hard to tell from pictures, but I have an older mark vii pump stand and there is a separate solenoid for rinse water and water for HP soap and HP wax. Would check that water inlet solenoid for HP rinse for function and make sure it's not clogged. Allowing water flow to pump inlet.

 

[Minni1986]

I would check for something loose on the input for that one high pressure pump. You might be getting air pulled into the pump.