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hello i am having a problem fixing this issue with my car it is a 1994 rx7 and has a cjm fuel rail with 850cc primary and 1680cc secondaries. i plugged all of the intake lines so it'll hold pressure and i fill it up with an air compressor and it just leaks out of the hole that the primary injector goes in. i replaced the primary diffusers and all the o rings for the injectors and tried it again it still leaks out.. is there another o ring or something I'm missing to make these injectors seal right ?
thank you for the responses! I bought the o ring kit and new primary diffusers with it and which ones are the insulators? Are the adapters the silver cylinder things with o rings on the outside that slide in after the diffuser? I put them back together the way i seen them in there but i don't know if it was wrong to begin with. i tried looking it up in the fsm but its a little different with the new injectors.
These o-rings on the cylinders as you call them are the insulators. I installed them into the holes first then slided in the rail (OEM rail though) evenly so that the insulators don't get out of the holes during this process. Make sure they are sitting correctly for you.
This is the injector insulator that i have sitting in the hole around the cylinder piece that slides onto the diffuser. this insulator is not snug at all and when i pressurize the system it pops up a lets all the air out
It should be snug and shouldn't be possible to pop or whatsoever, at least it is the case with the OEM rail which sits so tight that there is no way the insulator would pop.
Maybe you call CJM and ask them about this or somebody else will chime in with aftermarket rails installation experience.
I think they are Bosch 850cc injectors. they came with the car so I'm going off looks of the injector and I can post pictures of the injector friday. They are also top feed injectors.
if you look closely at the primary injector hole those are the silver inserts I'm talking about
if you're talking about the older, shorter, fat-bodied Bosch injectors, then it might be worth contacting CJ Motorsports to see if you may require one of the adapters that fit to the top. about how much movement are you getting?
when the injector is in there and all bolted down it feels like how its supposed to be but that insulator around the silver thing in the picture is what is loose it just sits in the hole.
Hello, i am kinda stumped on finding this problem with my single turbo rx7, i have top feed injectors that are bosch 850cc's on a cjm rail with he cjm injector adapters. the problem is that the lower injector grommet is letting air out when i pressurize it . I just purchased new injector adapters from cjm to fit the 14mm injector and before I install the new ones i was wondering if there is some kind of adapter that I'm missing that holds the lower injector grommet down because thats where all the air is coming out of. any and all comments are appreciated thanks
1. i deleted your new thread because it's basically a repost of this thread. i quoted the post from it above so nothing is lost. continue to use this until resolution.
09-07-15, 11:50 PM
