dillon410021

Is there a place that sells like liquid rubber that will help my injectors seal better? One of my new injectors is not sealing properly in the fuel rail and It is leaking slowly. The O rings are brand new. There has to be some high heat rubber something out there. What should I do.
thanks

kevincnc

I would figure out the problem and fix that, not put a bandaid on it. is the bore in the manifold damaged or is the injector not seating in far enough?

dillon410021

It is not sealing all the way where the injector goes into the fuel rail.

aribop

I always use a bit of bearing grease on both injector seals. It makes them go in without twisting and I have never had a problem with leaks.

aben8057

Dillion,

Check to see if your fuel rail is not tweeked which could be a culprit of the injector not seating properly. I also echo what was said about a band aid repair which could be a bigger issue down the road.

Lorax

I had this problem.

Took everything apart and put it back together and it's fine

Go figure

CarbonRevo

I've always used motor oil on both seals, on each injector.

cruise98

Take it apart and clean it up, re-grease and reassemble it.

I use silicone o-ring paste that you can find in the plumbing section at Home Depot. Works great on all o-rings.

INURGRL951

If it's the lower part that goes into the intake sometime the plastic shim behind is the wrong size so i take it out and double O-ring it. That say that will never work in automotive school but ALWAYS worked for me.


costas

hosrom_951

A bad fuel rail to injector seal caused a fire in my engine bay while driving 160kpr (put it out in time with minimal damage).

My buddy in Dubai has this problem, even with brand new Porsche seals, we even tried Bosch seals (which are the same but gave it a shot). No go, still leaked.

I gave him my old fuel rail from my Na parts car, and the problem is solved. So we guess that there was either a hairline crack that we could not see, or the rail itself was damaged (where the injector sits).

get a used rail and see if the problem goes away, if it does it means the rail has a problem, if it doesnt then it is definitely a seal issue, heck just borrow a fuel rail from someone for test reasons.

Tom M'Guinn

From your other thread -- fix the stripped fuel rail bolt holes first. That should fix the problem, since the injectors need to be seated all the way in to seal correctly. Also, assume these are factory injectors with original spacers, caps, etc. If not, post a picture. Don't try to use sealant to fix the leak. And, until it is fixed, don't run the motor without watching it with a fire extinguisher nearby. Hot exhaust is right under the fuel rail, which will ignite leaking gas. Has happened to many people.

dillon410021

I just tried the grease on the O ring method and the one injector is still barley leaking. I will tell you that this all started happening when I did my vacuum line kit. some of the stock vacuum lines were broken like the one that goes to the fuel damper and fuel press. reg. I think the fuel pressure is now higher which Is making it leak

Tom M'Guinn

Have you fixed the stripped bolt hole? If not, really, do that first.

mortymower

even with the vac line completely off of the fpr, the fuel press would be 2.5 bar (3 for a 3 bar reg). You see higher fuel pressure than that when on boost so vac line attachment should not have any effect on leaks.

Tom M'Guinn

And, high fuel pressure does not generally cause leaks (at the injector seal anyway).