Quote:
Originally Posted by Ziggster
My engine has/had both. Are you saying if a I have one in the sump pump I don’t need the one in the lifter valley?
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The function of the pressure relief valve is to remove undo load on the pump (and therefore unnecessary heating the oil) in cases of extremely high oil pressure. I believe it's best to relieve it right at the pump rather than allow it to go almost all the way through the engine, which would defeat the purpose of the relief system.