I didn't realize the other half of the injector had an o-ring. That o-ring was in the rail. Didn't think to look up in there...

if the o-rings are hard and brittle, do yourself a favor and replace them for cheap. the parts store should have them in stock. they are NOT standard o-rings, they have to be fuel-rated.

That o-ring should NOT have ended up in the rail socket. That'* not normal. They should be replaced now.

Normally, they're a little difficult to remove.

And make sure you get the right size. I have been given the wrong size a few times. Take one of the old ones with you to match it up with the new ones. Either lightly coat them with oil, or a little bit of Vaseline. O-rings may seem small and unimportant, but they are in fact one the most important things under the hood. One leak can cause a fire.

O-rings in the rail......that'* not good.

The o rings are attached to both ends of the the injector itself.
They only cost a buck apiece and should be changed everytime it'* removed.

overkill. but not a terrible idea.

for those on a tight budget, only replace if you see a need for it.