water back feeding into wash soap

[Don Sexstone]

Hello,
I have a problem with water back feeling into my high pressure wash soap in all three of my bays ? I have attached a couple of pictures for reference. I find it hard to believe all three pump seals are bad, I cannot for the life of me figure this out. I have only owned it for about 4 yrs and have never had a problem. thank you for your time.

 

[Randy]

Have you taken apart the soap solenoid valves, checking for debris? It could be a check valve that's coming off the bypass line that has debris in it. But I find it odd that all the bays are doing it unless you have a lot of debris in your soap tank.

 

[Don Sexstone]

Have you taken apart the soap solenoid valves, checking for debris? It could be a check valve that's coming off the bypass line that has debris in it. But I find it odd that all the bays are doing it unless you have a lot of debris in your soap tank.

I totally drained my tank and tried again.... the soap draws from the tank fine its the water coming from the pump .....all the bays suddenly doing it is the stumper !

 

[Randy]

Maybe a bad Check valve

 

[MEP001]

Solenoids don't have any way to stop flow in the reverse direction. I know that the two solenoids side by side are soap and wax, I assume the third one is cold water rinse. Does water come out the soap line all the time or only when the pump is running? "All the bays doing it" means what exactly, when you remove the soap line water comes out the barb? Does water come out only on one bay and only when rinse is selected but when you select soap with that line off the barb the pressure drops almost to nothing? If the last one best fits, the check valve inline after the solenoids is bad.

Kleen-Rite 944-430 | Brass Inline Check Valve | 1/2in. F x F

This resilient disc check valve is not lead free. It is not for use on potable applications.

www.kleen-ritecorp.com

If you don't run hot water, just shut off the supply to the rinse solenoid.

 

[Don Sexstone]

it came down to all 3 bad check valves I appreciate everyones help.

 

[Strava]

When you say bad check valve do you mean this valve? I'm having the same problem & trying to find a solution.

Hydro Systems Viton Foot Valve - Blue | Superior Car Wash Supply

Hydro Systems Viton Foot Valve - Blue

www.superiorcarwashsupply.com

it came down to all 3 bad check valves I appreciate everyones help.