On Fri, 26 Jun 1998 10:01:35 +0200 Nuno Pedrosa writes: > So, since my "targeted" vehicles (namely mine!) work with Diesel >Engines, with pressure injectors, the only feasable way I see is with >a >fuel flow sensor. Worse than that, TWO sensors. One for infuel, >another >for outfuel. Doing that will work very poorly. You'll be subtracting two large measurements to get a small measurement. Slight errors in the measurements will cause a large error in the result. Maybe the system could be rearranged so the recirculation occurs after the flow sensor. For example, add a small "day tank" fuel reservoir, then measure how much fuel needs to be transferred from the main tank to keep it full. The measurement could be done indirectly by using a calibrated fuel injector or a positive-displacement pump to do the transfer. A simple approach that doesn't involve the possibility of leaks is to just measure the position of the linkage that controls the fuel injector pump and engine RPM. For every position of the throttle, the pump will inject a definite amount of fuel per revolution. Integrate the flows over time. _____________________________________________________________________ You don't need to buy Internet access to use free Internet e-mail. Get completely free e-mail from Juno at http://www.juno.com Or call Juno at (800) 654-JUNO [654-5866]