Empty? Not very likely. More often they're way over filled which affects how the pump works.
Two things to look for is a leaking cold start valve and a stuck warm running device. Either will produce a really rich mixture that will foul out a set of fresh spark plugs very quickly. Once the plugs are fouled it won't run at all.
Injectors are very hard to find for this car and they all have to break ( inject ) at the same pressure. This is not an easy system to get to work right.