Well, I don't want to use barrels nor fuel stations. I'm talking about filling up vehicles using commands. In the mission you are to have imaginary fuel cans that you can use together with your vehicle. Picture this scenario:
"Oh no, I'm running low on gas, I have to fill her up!" You get out of the vehicle and fuel the vehicle with a fuel can using either the action or radio menu (haven't made up my mind yet).
Now, the only way I know of doing something even similar to this is to use the "setfuel" command, but that command doesn't care about how much fuel you had in the first place, it just sets a new value, and I don't want the fuel cans to fill the vehilce up to max. I also want the player to be able to use more than one can at the time, which will make it possible to fill up the vehicle to the limit using many.
This nut might be impossible crack... it's not very easy for me to explain this anyways
Cheers