So this is my first post on this forums, hopefully im in the correct spot.

I have a moderate leak in my 94 4Runner 3.0 V6, so I replaced the power steering pump and I still have a slight leak when the steering is under load and it is coming from the PS pump area. Installed new o ring to reservoir, new copper washers to the union bolt and new hose clamp to the return hose into the reservoir.

I noticed also that my air control valve had been broken and the previous owner had JB welded it and its not holding. I thought that this was vacuum only. Does fluid go through here or not? If this is not the source I am at a total loss as to what to do...

 

I just replaced the pump and both lines on my '95, and when I was in there, removed the air control valve and replaced it with a threaded bolt. I have not noticed and issues since by-passing this, so it is an option. You might be able to use a thread sealer if yours is leaking, and you can also just loop a piece of vacuum line from one port to the other to by-pass it. After reading what a broken valve can do to the engine, I decided I could live without it. Also, you did use the right fluid, correct? Mine was filled with power steering fluid, which caused all the mess in the first place.

 

The vacuum valve does come in contact with the fluid so it can leak from there.