I have done a lot of research and got conflicting info, so I wanted to ask here. I am in the process of replacing my lower intake manifold. I bought the kit that has new O-rings but I am confused as to where they go. The kit has three small o-rings that are different sizes, and one larger one that might be for the fuel pressure regulator. There are two that I think go on the supply and return fuel line, but I think that I put these in the wrong place. I put them on the end of the lines that go inside the spider housing and tore one in the process. I blew compressed air in the fuel cavity and blew out my torn O-ring (got lucky) and also blew out part of another O-ring (have no ides where that one came from). When I removed the fuel lines originally, the lines just "popped" out and no O-rings came with it.
I found one youtube video that showed two O-rings on the back mechanical connections for the fuel lines located near the firewall. When I took my fuel lines loose during intake removal, no O-ring was noticed. I guess it is possible that they were dry rotted and simply fell out when I took the lines loose. Those fittings look like some type of "flare" fittings and I am not used to putting O-rings on flare type fittings. This is why I did not think that the replacement O-rings went there. If there is some type of O-ring or assembly that goes inside of the spider housing, I do not see one anywhere. I also have no idea where the third (largest of the smaller) O-ring goes that came in the kit.
Thanks for any help as I so don't want to put this thing back together and have fuel issues..........

 

Here you go. They are probably still in the injector assembly, underneath the plastic retainers. You may have to carefully use a pick to pull the old plastic retainers first

 

I saw that drawing in my search, but it didn't look like what I have. Then again, the spacers did not come out when I pulled the fuel lines from the spider assembly. In addition, nothing like that type of O-rings, spacers, etc. came in the intake gasket kit either.
Your drawing does not show the other fuel like connection near the firewall, do you know if O-rings actually are installed there? I also have a third little O-ring that I have no clue as to where it goes.

This is the first time that I have tackled this type of repair and I never imagined that the hardest part was going to be changing out O-rings.........

BTW, thank you for your reply.