Fuel Pump Voltage Boosters
If the lines and rails are too small, that does need to be resolved.
If 255 liters per hour is not enough fuel, then a boost-a-pump can get you an incremental gain without having to go to twin pumps.
On the KB site there is a reference to testing larger lines and discovering that sometimes it was just an unnecessary expense. (to be taken with a grain of salt since it is from a seller of a booster as a solution...)

