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Message: <blockquote data-quote="MidniteGT" data-source="post: 702618" data-attributes="member: 12690">Re: Camshaft Pos Sensor ProblemFrom what my father told me 99+ is a returnless system(only one line from gas tank to engine) and that there is a fuel pump driver modular(is that what you might mean when you talk about a NR Valve Chris?) which takes the reading from the frps(I believe that is what he said) and modulates the pump so its not working 100% of the time therefor not needing a return line nor a regulator. also said some times that FPDM when hot will not work properly when started back up. What he doesn't know if there is a way to check them individually to see if one might be not working properly. That is about the most i know of this system now. My father has never worked on a 99+ so that is all the info he had to give to me, which was a lot more than I knew hehe.</blockquote>