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It sounds like you have a motorcycle with a carburetor with gravity fed fuel line. (i.e. Without a fuel pump of any sort). In those conditions I can see that there is a higher fuel pressure at the inlet to the carburetor when the fuel tank is full. It's possible that when the tank is low the pressure is barely enough to meet fuel demand. With that said, ...


You cannot easily "tap" into any ECU/PCM. Depending on what year your vehicle is, it could be a simple set of analog gauges which you could tap into the signal line, but you'll need to do some hardware design to convert the signals to usable data. If it's a newer vehicle, you'll have to deal with the canbus protocol and that will be very difficult. Your ...


If your car has a OBD2/ODBII port then it is achievable. I'd imaging the simplest way would be to use a ELM327 type cable or even a bluetooth adapter to provide the interface between the pi and the car.


To affirm Max's answer, yes this shouldn't be too difficult. Here's a great link to get you started Very cool project, it'll be interesting to see how it turns out for you.

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