Forgetting for a moment that we are speaking of Morgan three wheelers...... A normal EFI system has a pump that will deliver more volume of fuel then the motor could ever use. Included in the EFI system is a pressure regulator whose job it is to turn the pump on and off to maintain whatever line pressure is deemed appropriate by the manufacturer. Demand on the system (more fuel, less fuel) is then handled by the ECU varying the amount of time the injector is open. The ECU figures out the time by the fuel map in its memory and sensor input.
The fuel pressure has to stay stable throughout the rpm range for the system to work properly. All the components are more or less "tuned" to work together as a system.
The ECU has a certain amount of latitude built into it which is why the M3W posts fault codes saying the injector maps are out of limits when the pump goes bad and line pressure drops.
Modern EFI is truly a marvel when compared to mechanical fuel injection and carburetors.
Nicely put Sir. Most EFI runs the injectors to a max of about 80-85% duty-cycle I think, meaning that there's a little headroom left to increase fuel flow if the ECU calls for it (depending on the demand signals coming to it from the various sensors around the place). That's also why turning up the fuel pressure is a popular trick when tuning a car, as more fuel squirts in when the injectors open for their pre-programmed intervals.
Somewhat easier than setting up a pair of 40DCOE's with a box of jets, a screwdriver and that length of hose....!
