94 Rx7 Fuel injector diffuser removal.
 

I pulled my primary and secondary fuel injectors out and got them cleaned by RC engineering and I was wondering if there was any trick to pulling out the diffusers underneath the injectors? They seemed extremely stiff and extremely fragile.

I know that the secondary fuel injector diffusers have an O-ring that needs to be replaced according to the FSM. Should I just replace all four diffusers while I have everything apart?

YMMV, but I was able to get mine out with minimal drama.

The primary and secondary diffusers are a little different. I remember the wedge shaped ones for the primaries being really fun to get out.

The secondaries were much easier, as they had a lip that I could gently pull/pry on until they popped out.

For the primaries, you'll either have to find a way to push them out from inside the engine, or fashion a hooked shaped thing to gently pull them out with.

You have to be patient and careful taking them out, they can/will crack/shatter if you try to strong arm them, and that would be a bad time.

I don't think I had to do this, but if you clean the area, spraying some lubricant might help loosen them up. I think its the seal from the old orings that keep them stuck in there.