[lendaddy]

Thanks guys, I can flow/pressure test the low side pumps/system easy enough (and no doubt I should have done this right off the hop but hey).

Assuming that checks out I was looking for thoughts on blocking the relief valve to test the theory that it's bleeding off prematurely.

If its purpose is just for emergency relief at abnormally high system pressure I would feel comfortable blocking it off for a test (until my part arrives and I can replace it altogether). But... if the system is designed to use this valve regularly to limit the high end of the pressure scale I'll not try it as I would hate to expose the downstream components to pressures that might damage something...I'll just wait for the part.

My guess is that it's just an emergency/abnormal-conditions safety valve and the pump regulates itself internally but I wouldn't be shocked to find I'm wrong.

Not the end of the world to just wait for the part, I have other vehicles but the impatient child in me can't help but want to know in advance so I can try something else in the interim.