Alright mate, the best option is whip all 4 injectors out, (make sure you number them) and get them tested. hopefully your pump is ok. if its just a dodgy injector the tester should be able to repair it, if not he should be able to supply a recon. dont worry about codes, i had 3 original injectors and 1 exchange,and after a few mile the ecu learned it.

Also the tester will check for swarf and fingers crossed your pump is ok. what milage is the car on?
just look for a delphi specialist in your area.