>     The only problem is I don't know where you would get the injection
>     quantity per pulse value, but it might be in the shop manual for the
>     vehicle in question.



Fill the tank, zero the counter, drive for a while (the longer the better)
refill the tank, and enter the fuel quantity used to refill.

During this process, we've been counting injector pulses, so we now
know that there are X pulses per gallon. (liter or whatever)