M809 Power Steering Pump Spewing Fluid via Vent

[77 AMG]

Hello, all! I have a headache that I am trying to figure out on my M813. The power steering pump is CONSTANTLY "puking" fluid from the vent, next to the cap, even when it is NOT running. Any ideas? I am in the middle of replacing the throw bearing that went bad, and thought that this also be a good time to deal with the power steering issue.

 

[Ajax MD]

Puking when NOT running? You got me. Sounds like a pressure build up that just doesn't let go.

 

[77 AMG]

Yeah, I thought about that, as well. I need to see where the pressure bypass valve is on it, and see if it is maybe stuck. The engine bay gets REALLY nasty after a few miles of driving...

 

[NDT]

This happens due to air getting sucked into the system in return lines that have pinhole leaks that don’t drip for some reason.

 

[77 AMG]

Thanks, NDT. I will check into that.