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Hey guys, gf's R33 has a serious fuel leak from #5 injector.

Anyway being a RB20 person, RB25 is a new engine to work on, so I've removed the injectors/rail and was wondering if the "cap" seals the very top (highest point) of the injector? or is it just the "upper o-ring" that would be the upper most sealing point and culprit in this case?

Also a quick research on the interweb shows this being the upper o-ring p/n 16618-10V05. Can anyone confirm this and what our local Nissan charges per o-ring? Highly doubt they will be $2.00ea like FRSPORT (http://www.frsport.com/Nissan-Genuine-OEM-Injector-O-Ring-UPPER-SR20DET-KA24DE-RB25-RB26-VG30_p_60199.html)..

Appreciate all feedback :)

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https://www.sau.com.au/forums/topic/425877-rb25-injector-leak-question/
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  • 1 month later...

Like these?

http://www.kudosmotorsports.com/catalog/nissan-fuel-injector-seal-kit-single-injector-genuine-nissan-200sx-s14-s15-skyline-r33-sr20-rb25-p-1181.html

If they are leaking its more then likely an injector problem

The fuel enters from the side (Rail) and then goes out the bottom. If the fuel is coming out the top then that injector needs to go in the bin

  • 8 months later...

Taarks also sell OEM o-rings in kits.

The smaller o-ring is what seals fuel pressure from entering the plenum, the larger o-ring prevents fuel from leaking out the top.

I bought a can of silicone spray and pretty much drenched both the o-rings and fuel rail before installation to avoid damaging/twisting anything. Seemed to work pretty well.

I can supply Oring kits for side feeds from the wholesaler, I think they were around $10 an injector last I checked. Not sure if they are OEM, but why would it matter? Nissan didn't make the Orings anyway, and rubber fuel seals have come a long way since the RB was made.

I just found out they can supply 550cc side feeds too, probably the same as Nismo's at a guess.

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