1) The injector is pulled from the insert, with main O-ring and end cap/small O-ring together
2) The end cap is removed from the injector with plyers. Replace the O-ring now, or before installing the injector)
3) Remove the "C" clip (the old, large O-ring can just be cut or pried off - mine were dried and brittle)
4) Take the new O-ring (after soaking in a little gas) and slide it over the injector until it seats in it's groove
5) Reinstall the "C" clip
6) Reinstall the end cap
7) Remove/install inserts if you want to clean them
8) Smear a little oil on the O-rings and insert the injectors
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