Thread: Strange combo (Freeway knocking & jumping oil pressure gauge)

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Yes Ken, there is a pressure relief spring in the pump that dumps excessive pressure when the spring is compressed enough to uncover a dump hole. If you want more oil pressure than what the spring is rated for, you can either shim the spring with small flat washers or you can replace the spring with one that has stouter wire diameter. Here's a Melling with a screw-in spring retainer plug, making changes easy.....
http://www.chevydiy.com/wp-content/u...014/01/816.jpg

I personally have never seen an oil pump fail, even on motors with in excess of 200,000 miles on them. What I was thinking when I answered above is that the filter element material is coming apart inside the filter and changing the characteristics of the operation of the filter, ala some Fram filters in the recent past.

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