[chesters6]

i think the pressure wouldn't be enough to keep up with the pump that squirts it through the injectors .
the mechanical pumps depend on the petrol stored in the carb to make up the differences in engine speed as they are directly driven by it ,i expect putting your foot down has a lag producing the fuel needed which would not be liked by a injector system as they work on higher pressures.
theoretically you dont need an in tank pump just a powerful outside one to suck the fuel out fast enough.my MK2 espace (horrid car) also G reg never had an in tank pump only an external one ,i presume (will await for more experienced members) a sender from a carb version and an external pump would work ????????????