Patent ID: 7448260

Claim:
A device for measuring the consumption of fuel in an internal combustion engine system, the engine system having a plurality of fuel injectors for injecting fuel into an internal combustion engine, a fuel tank containing fuel for feeding the engine, a transfer pump for transferring fuel from the tank into an injection pump for feeding the injectors, and a fuel return line for conducting exceeding fuel from the fuel injectors back to the fuel tank, and a power source for providing energy to the device, whereby the device is autonomous, the device comprising: a main body defining a first and a second lobe-shaped flow-measuring chambers; a first flow meter in said first lobe-shaped flow-measuring chamber and second flow-meter in said second lobe-shaped flow-measuring chamber, wherein the first flow meter comprises a pair of first lobe-shaped rotors rotatably mounted within the first flow-measuring chamber and the second flow meter comprises a pair of second lobe-shaped rotors rotatably mounted within the second flow-measuring chamber, the first flow-measuring chamber having a fuel inlet port and a fuel outlet port connected between the fuel tank and the injection pump and the second flow-measuring chamber having a fuel inlet port connected to the fuel return line, and a fuel outlet port connected to the fuel tank, and at least one first sensor for detecting the rotation of the first lobe-shaped rotors, at least one second sensor for detecting the rotation of the second lobe-shaped rotors.