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Old 06-11-2010, 08:05 PM   #1
eppoh
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Default Injectors leaking

We just put the engine back together after rebuilding heads. The injectors are leaking badly from the top where it meets the rail. They still have the old seals, that were not leaking before. The rails are bolted down but it seems like there is not a good seal at the top of each injector. Seems like I am missing something here. They are just dripping fast and engine would not start. It is a 2000 impreza 2.2
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Old 06-12-2010, 06:56 AM   #2
07ImprezaMB
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Man you have got to use common sence here. Seals are just like your gaskets, they should be replaced every time you take a part off (example:remove cylinder heads, replace head gaskets) in this case, you removed your injectors, the top fuel line seals should have been replaced along with the lower ones sealing the injector into the intake manifold. I'm not trying to be a dick here but it is obvious what the problem is when you stated that you reused the old seals and now they're leaking. That should have thrown up that little light bulb above your head right there!
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Old 06-12-2010, 10:55 AM   #3
eppoh
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I have removed dozens of injectors and replaced them without a single leak in Hondas.
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Old 06-12-2010, 11:03 AM   #4
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did you use any lube when putting the rails back on? the rings may have become deformed or twisted. I forget what kind, but use something that won't gum up your injectors and is compatible with gasoline.
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Old 06-12-2010, 12:24 PM   #5
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you probably pinched several injector o-rings when re-installing them. When I remove injectors, I apply a very small amount of used motor oil to the o-rings prior to each installation. This allows them to slide in easier without pinching the o-rings and the oil, when dry, helps to create a better seal.

I'm confused as to why the injectors were removed at all for a head job but I'm sure there is logic for it somewhere in your tale.
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Old 06-12-2010, 01:23 PM   #6
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Silicone paste works nicely
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Old 06-12-2010, 02:10 PM   #7
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I ordered new orings and seals for them today. It looks like there is not enough pressure pushing down on the large seals for the orings to seat. Maybe they are just old and dry. Looking back, we did not need to remove the injectors to do the heads, but we were just following the Haynes manual, as I recall. Next time, I'll know better. Live and learn.
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Old 06-12-2010, 03:09 PM   #8
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Quote:
Originally Posted by yarrgh View Post
did you use any lube when putting the rails back on? the rings may have become deformed or twisted. I forget what kind, but use something that won't gum up your injectors and is compatible with gasoline.
http://www.aircraftspruce.com/catalo...ezturnlube.php
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Old 06-12-2010, 06:43 PM   #9
yarrgh
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also, they might be different sizes top to bottom. If you took them all off w/o labeling them, you may have mixed some up.
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Old 06-12-2010, 07:06 PM   #10
eppoh
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Did use some light oil when re-installing the injectors. Did not remove the O rings from the injectors..

When I look at the injectors installed, it does not appear that their is sufficient downward pressure on them from the fuel rail.

I don't think the rails are bent, They are pretty stout.

It is an odd design with offset pressure
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Old 06-12-2010, 08:03 PM   #11
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take it back out and check out the seal
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Old 06-12-2010, 10:37 PM   #12
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Quote:
Originally Posted by justchillax808 View Post
take it back out and check out the seal
Not much else you can do besides this.
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Old 06-13-2010, 09:03 AM   #13
eppoh
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I'm wondering... It has been six months since the engine was run, and the injectors have been sitting in bags with whatever fuel residue was left over in them. Is it possible they all got clogged and the pressure is backing up in them? I will try to clean them. Anyone know what the operating pressure is for them and if they are 12volt or something less. Guess I could use a big syringe with some BG cleaner to run through them, while hooked up to a battery.
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Old 06-14-2010, 11:22 AM   #14
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Quote:
Originally Posted by eppoh View Post
I'm wondering... It has been six months since the engine was run, and the injectors have been sitting in bags with whatever fuel residue was left over in them. Is it possible they all got clogged and the pressure is backing up in them? I will try to clean them. Anyone know what the operating pressure is for them and if they are 12volt or something less. Guess I could use a big syringe with some BG cleaner to run through them, while hooked up to a battery.
It doesn't work that way.

The only failure that could cause your issue involves the o-rings.
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