Dave, I know the fuel system pretty well, but all the information you are asking for, cold & warm pressure, system, rest and control pressure is in the technical manual. 2 pages of it. If you don't have one you can find it on my web site. John Hervey www.specialTauto.com Home of the Powder Coated Alternator << Does anyone out there know the DMC fuel system really well? How can I measure the fuel flow? Can I use information from the frequency valve and RPM? Any ideas? I want to build a driving computer and I have bought a Compaq 2010c as the base. It should look nice sitting on top of the center console with it's 640 x 240 color screen. It will display time, didtance, MPH, miles per gallon, inside and outside temperature, battery voltage, air fuel ratio, as obtained from the Lambda, RPM, ETA for an entered trip, distance to empty, etc. I'll keep you posted but my main stumbling block right now is measuring fuel flow. Will I need to get 2 seperate fuel flow sensors and put them in the feed and return lines and calulate the difference? All pictures and update will be posted to my website, currently under construction, at www.dmc12.info >>