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Message: [QUOTE="Tree Trimmer, post: 339523, member: 716"] i dont know how the fuel system on a 6.4 is routed. keep in mind, i come from a 7.3, and im assuming, really, the only difference is the addition of a hpfp. have looked at some schematics of the fuel system, and thats my take on it. turning the pressure up in the ad, means all the flow is goin through it. there is no return from the ad. meaning any volume produce by the ad, goes to the hpfp. this is where my slight confusion will take place. im assuming the secondary regulator is on the return of the system. this is the regulator that will determine system pressure. you do not want this regulator, and another, to "share" the job. this is why wayne told you to max the ad regulator. the system is goin to return through the lowest regulated port. if its the ad, even intermittently for whatever reason, then you have fuel not even making it to the hpfp. it is the, aeromotive in your case, then 100% of fuel flow is goin past the hpfp, and it can drink as much as it wants, and spit the rest out. my understanding of it, should be something like this. tank, ad, fuel bowl(or not for some people), hpfp, aeromotive, return. not tank, ad/return, fuel bowl(or not for some people), hpfp, aeromotive, return. i get that right? [/QUOTE]

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