Thanks for the post!

You are correct, this pump does take 75w90 oil (about 4.5 oz I believe). Oil shouldn't leak from the pump, no, it should be sealed in the pump.

As far as where to add the oil, I'll see if I can find out for you. I've not personally seen this particular pump model myself so I'll ask my tech and find out.

- MTR

You can certainly find a local authorized service center to have it diagnosed/repaired, just click on the link below to find out where:

www.powerstroketools.com/service_support/service_center_locator

- MTR

The pump contains oil in the drive portion of the pump housing and it is sealed from the pumping portion of the pump by seals, gaskets or both depending on the type of pump. It sounds to me like the internal seal (whatever is used in this pump) between the pump portions is leaking, allowing the oil from the drive section to leak into the section that pumps the water and builds pressure. Usually the only way to add oil is to disassemble the pump.
Some pumps will have a water seal kit available to repair this problem, but looking at our website I only see that only a pump assembly is available, no repair parts. Most of the time with the cheaper pumps it is more economical to replace the pump than to try to repair it.

- MTR