i need help on flow measurement transducers..!!!

hi.. i am working on a project ... with the flow measure of fuels in automobiles.. so ..i needed a help on how to design .. a flow measuring transducers... so plz give me in depth details on this.. and suggest the best ...possible technique..for this application...

please help with some links, books and circuits... on this topic...

I'd suggest you take a close look at what they are doing in automobiles currently. An automotive forum might be a good resource. It's possible that many autos measure fuel flow by looking at fuel pressure and injector operation. If they don't you might give that a try.