However, two engine directors disclosed last year the technology required for the fuel flow meter does not (yet) exist, with one even doubting that a sufficiently accurate (0.2%) unit could be developed within the time frame.
Teams currently have fuel flow meters delivering such accuracy – half a kilogram of fuel per 160kg tank load – but, says one ED, these are 'the size of a small wardrobe, cost tens or even hundreds of thousands of Euros and weigh hundreds of kilograms'.
So, how could a mass flow rate be measured to the required accuracy?
Would one option be to measure the volumetric fuel rate and calibrate the device for use with each of the different fuels in use by the teams (each fuel has to be submitted for testing, and compared with the lodged "fingerprint" at each GP)? The extension to that would be to have a standard fuel over all teams, thus simplifying the calibration process.
Another option is to test the engine on a dyno, accurately measuring the mass flow rate used by the engine over all load and rpm points. The engine would then be marked as one of the units the team can use during the season. But that would require the testing of 60+ engine during 2013, and 48+ from 2014. The FIA could then use the data to equalise the engines.
What other options are there?