Vacum leak at fuel injector

[fatlizzard]

I have a code 76 on my ecu (fuel injection system)
and I can hear a hissing sound while the engine is running, I tracked the sound to the rear rubber grommet that holds the fuel rail to the intake manifold, If i spray carb cleaner on or arround the rubber grommet the engine tries to die, it also tries to die if i spray the other 3 grommets that are not making noise!!!
Is it the grommets that are bad or could it be the o-rings on the injectors ???
Can you replace the injectors without pulling the fuel rail ?

Thanks !!!!!!!!!!!!

"95" 240sx SE with ka24de

[awesomenick]

The big round ones are injector o rings. You can buy them at most parts stores. You can take fuel injectors off without removing the entire rail, just pull off the injector caps.

[fatlizzard]

Actually I'll have to pull the fuel rail anyway because i need to replace the rubber o-rings where the vacum leak is !!!

[projectRDM]

The fuel rail could be bent too, try prying it towards the engine to see if that helps.

[fatlizzard]

Do the large rubber o- rings that the rail rail sit on seal anifold vacum or are they just to keep dirt out of the injectors ?

[projectRDM]

Do the large rubber o- rings that the rail rail sit on seal anifold vacum or are they just to keep dirt out of the injectors ?

They seal it from vacuum, boost, fuel, and debris.

[fatlizzard]

would it work to use a silacone sealant on the rubber grommets between the fuel rail and the intake manifold ?

[projectRDM]

No. Silicone + fuel = leak.

Find out why they're leaking, they may just be dry rotted or torn and need replacing.

[fatlizzard]

I just put new ones on about a month ago but I didn't replace the o-rings on the injectors themselves, could the injector o-rings be what's causing the vacum leak arround the fuel rail grommets ?

[fatlizzard]

Replaced the injector o-rings and fuel rail rubber grommets,no more vacum leak and injector system code 76 went away,I still have an EGR and knock sensor code!!!!