In 2005 when we build the car we had the fuel injectors out, added new o-rings and gave them run in an ultrasonic cleaner. They are now 33 years old and are overdue for a refresh. Found this company here in the UK who supply rebuild kits: https://mrinjectoruk.co.uk/ I send them an email before ordering and they advise BMW kit 10 was suitable for the 0 280 150 715 injectors. Arrived next day.



Rocker cover off for access, took the wiring harness off, loosed the 4 bolts holding the fuel rail on and pulled the injectors up and out. Had to remove the clips from the top of the injectors which hold them to fuel rail and I was able to get them out one at a time.





Condition as removed, pretty dirty. The o-rings are still in reasonable shape as they have been changed before.



The filters on the the other hand were dark and old looking. Getting the filters out took some careful manoeuvring with a screw driver and a pick.



While the cap, o-rings, spacer and filters were out dropped them into the ultrasonic cleaner



After all 6 injectors it was starting to look a bit disgusting



Shiny new parts!



Pushed in a the new filter and added a new o-ring:



Installed the new spacer, o-ring and cap on the other end.



Repeat 6 times for a full set!



Installation is reverse of removal, put all the injectors into the fuel rail first and add the retaining clips. Then carefully line up with the intake manifold and push into position. Reattach the fuel rail with the 4 bolts and reassemble the rocker cover and crank vent tube.



Took it for a good drive today, seems to run smoother and idle better, so I’d call the a success! This job is not too bad to DIY, helps if you have an ultrasonic cleaner.