My track does random checks every so often during normal club races and every1 is called up with there car they check the width that its safe and fuel tank capacity dont chekc the weight though. and they check if we are doing any big race also.
i run the mbx5r i have neve measured the tank capacity but i am going to now currenty i am gettign 10 mins
+ a tankwhich means dont have to pit during are 10 heats.
just checked mbx5r fuel tank when full to the brim holds 115ml