No oil to top end

RustyRatRod said

I don't consider a sticking bypass valve a "failure" of the oil pump, simply because an oil pump should be completely disassembled and inspected and clearanced if desired, before installation. To me, that's just a normal part of a build. So a stuck relief valve would be caught and dealt with then. I do agree with Karl though that if an oil pump cannot handle the debris that's small enough to come through the pickup screen, then it's a POS. I always use Oil pumps that are made in USA. If you've ever seen an import knockoff, then you know there's a difference.

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I agree, it's not the pumps fault. Even if the pump and bypass valve are properly cleaned and clearanced on assembly, debris can be shed during breakin, when a part is failing or wearing or if the engine is opened up to be worked on. None of the pumps foreign or domestic are designed to keep small debris out of the pump. On rare occasions this can cause the valve to stick. Look at the size of the holes in the screen. It's a coarse strainer not a filter. I have seen the best pumps stick a properly clearanced bypass valve. For better or worse It's how the oiling system has been designed for years.