Power Steering Leak

[JMF]

69 Coronet, 383

On full lock the power steering fluid is spraying out 1 side of the cap, I turned the cap the other way round and the spray is coming from the other side so it's obviously only 1 side of the cap that is the problem, is it a case of of just replacing the cap or is there anything else I can look for ? The seal looks ok on it, not sure if you can tell from the below pic, if I need to order a cap is there any particular one I need to get as I couldn't see any numbers on it ? The pump has some numbers on it, see below, also it says vented on the cap but where exactly is it venting as I can't see any holes, I assume the grooves are the vents ? Thanks

[303 Mopar]

Are you sure it is not over filled?  You don't need very much fluid.

[Bronzedodge]

I'll second that.  You should be able to remove the cap w/ the engine running.   The reservoir is at a very low, low pressure.  Either overfilled or a pressure leak somewhere.   

[JMF]

Thanks, it was low as it wasn't reading hardly anything on the dipstick but was still leaking, I think i'll try either a new cap or new gasket first, any idea where I can get a cap or what one I need ? Thanks