Measuring Fuel Consumption Only.

[KnightLore]

Hi everybody.
First of all, congratulations for this wonderful project!
I'm a programmer with some knowledge in the field of Arduino and c++.
I've downloaded the original code and other modifications, and is really hard to understand, specially with all that interrupts and precise timings.
I working in a project that only needs to measure the fuel consumption (in liters) and just send it to the serial or store in an accumulator. No need to know anything about the vss or any other data, no lcd, just the amount of fuel which go through the injector.
I need help to just isolate the part of the code that do that. I've tried by myself but is hard to know if I'm touching something that could affect the precise timing.

Thank in advance!