while waiting on the last few pieces of my generator, i was trying to figure out how to meter the output of the generator accurately. a constant supply of hho would not be very efficient in terms of engine power and efficiency. so i am thinking of using the evap purge canister valve to meter the output to start with. the evap purge valve is good because 1 it doesn't open until the engine is at a certain temp. 2 because the computer pulse width modulates it to open only when the vehicle has been idling for a certain period of time and under certain load conditions while driving. thinking of using a pressure gauge and using the pwm for the generator to keep the pressure at certain psi so the output would be consistent. i could either unplug the evap canister from the purge valve or use a one way valve to keep the hho from going into the canister. eventually i will use an injector to meter the output to whatever i find is best.