Rb20det vacuum hose walkthrough one clean rb20det rb25det diy duration rb25det neo forward facing plenum vac lines explained duration . Hi all i have an rb20det in an s13 and im in dire need of a engine vacuum diagram or some pics of where all the vac lines go as well as the big one that runs . There is only 3 things that need vacuum on an engine in order for it to run in my casemy rb20 needs vacuum to the blow off valve fuel pressure regulator . Rdoes anyone have a diagram of vacuum and boost lines of where they go and connect to i have some type of vacuum leak and . You need vacuum for boost gauge fuel pressure reg x 2 one at either end of the fuel rail bov brake booster those are the necessary vacuum lines
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