So, I went with the Bosch 3’s and have a question about installing them. Is it better to put them in The fuel rail first and install or insert in the manifold and put the rail on afterwards? I did the rail first, but they seem to stick out of the manifold too far? Thanks in advance.

 

replaced mine in the spring, but with delphi's. put them in the fuel rails first, then carefully got them all lined up in the manifold, and sort of worked around each one a little bit at a time.

 

Fuel rail first for sure.

Delphi uses clips so you kinda gotta do that. The Bosch don't but it's just easier to do that way. Lube up the o-rings. I used some engine oil. Just so they dont snag/rip. You'll hear the injectors seat.

 

we have found over the years that it's better to install them into the intake. Only reason is that we used to get a ton of calls with people complaining that fuel was spraying out from the rail.
When they installed them into the intake first the problem was gone. Think it has to do with the alignment when these things are installed.

 

0. Disconnect battery positive and cover it.
1. Make sure the existing injector o-rings are removed (just look at the removed injectors. Should be one at the top and the bottom.
2. You do not reuse the retaining clips from the original injectors
3. I have a done a bunch of these and greatly prefer to "pop" them into the fuel rail first, then lower the rail down. The lower seal is an easier fit.
4. I use vaseline on the new injector o-rings, top and bottom.
5. The new injectors should "pop" in, all the way up and have a sort-of solid bottom out.
6. I take some bending liberties with the two solid fuel lines coming from the water pump. This allows me to bend the rails up high enough so that I am not fighting them.
7. Do not overtighten the fuel rail bolts. 15 ft-lbs.
8. You will want to remove the runners on both both sides.
9. Once bolted back in, each injector should rotate smoothly and the same in its position. If one is tight, something isn't right.
10. One the rail is down, reconnect the battery and turn the key to the Run (NOT START) position a few times to pump up the rails. Then sniff/inspect for gas leaking. If OK, disconnect battery and finish install.

 

Also, highly recommend a tune afterwards.