Hi!
I have a Sti V3 type-r which has a power steering leak.
On a day of hard driving (rally style) the car looses about 0.5L of power steering fluid. I jacked the car up today and with the engine idling I turned the steering right and left repeatedly while keeping an eye on the power steering pump and its hoses, as well as checking the steering rack from below, no leak was found. However turning the steering while the engine was not running, resulted in a leak from filler cap.
Is a leaky filler cap for the power steering fluid a common problem when driving hard? Other ideas for leaks?

 

the gasket on the rear of the pump are a common thing to leak found behind the pump itself it will appear to be leaking from a bolt but thats quite a large leak how long are these runs

 

Thanks!
Have been testing the car on high revs today, but haven't found any leak, so I guess I just need to keep an eye on it and see if I can find the leak while the car is used properly. Unless there are some other good sugestions.