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Forced Induction Forum Sponsored by Active Autowerke
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Old 03-11-2013, 07:48 PM   #1
GRK///M3
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HPF fuel injectors

Has anyone come across or had problems with the 750cc injectors falling apart/separeting Click image for larger version

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Old 03-11-2013, 08:04 PM   #2
Evil Twin Rob
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I've had the same injectors since 2007. No problems with mine.
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Old 03-11-2013, 08:15 PM   #3
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Yikes!
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Old 03-11-2013, 08:28 PM   #4
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Yes, we had one car that did exactly that. It's not the actual injector separating, it's an adapter that is coming apart. I can't remember off hand how we sealed them up but it worked nicely.
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Old 03-11-2013, 08:30 PM   #5
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I've had the same injectors since 2007. No problems with mine.
You might want to check them. Just got off the phone with HPF, they said the don't even use them anymore because of issues they are having with them.

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Old 03-11-2013, 08:37 PM   #6
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Yes, we had one car that did exactly that. It's not the actual injector separating, it's an adapter that is coming apart. I can't remember off hand how we sealed them up but it worked nicely.
Did that car have a strong fuel smell in the drivers compartment?

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Old 03-11-2013, 10:03 PM   #7
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Ive seen this a few times, the fix is very easy. get SEAL ALL from the auto store, its for oil/gas. clean them up best you can and get new Orings from chrisk. use the Seal all on the injector, spread it out evenly, wait 5 minutes then press the injector into the sleeve and keep it clamped however you want. fuel smells will go ago and this can also cause small small boost/vac leaks and make car run lean under boost.
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Old 03-12-2013, 12:49 AM   #8
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Ive seen this a few times, the fix is very easy. get SEAL ALL from the auto store, its for oil/gas. clean them up best you can and get new Orings from chrisk. use the Seal all on the injector, spread it out evenly, wait 5 minutes then press the injector into the sleeve and keep it clamped however you want. fuel smells will go ago and this can also cause small small boost/vac leaks and make car run lean under boost.
Thanks for the info...I call you tomorrow.

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Old 03-13-2013, 11:30 AM   #9
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There was a brief period where their supplier installed the sleeves on with crazy glue, and gasoline dissolves crazy glue.
You can either put some sealant, you can epoxy them, or you can install a regular o-ring on the injector itself inside the sleeve.
Just be careful not to get anything on the nozzle plate.
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Old 03-13-2013, 02:59 PM   #10
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The injectors are plain small Siemens Deka with a plastic adapter to make them the correct size in length.
Even if the glue is dissolved it should not go apart - the fuel rail should keep them in place.
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Old 03-13-2013, 06:20 PM   #11
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The injectors are plain small Siemens Deka with a plastic adapter to make them the correct size in length.
Even if the glue is dissolved it should not go apart - the fuel rail should keep them in place.
The fuel rail was holding them together...the problem was fuel vapors/mist coming (under boost) from where the sealant/super glue was supposed to be. In the pic you can see a yellowish stain on the head behind the fuel injectors from the gasoline being sprayed onto it.

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Old 03-13-2013, 06:40 PM   #12
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Originally Posted by NikolaiD View Post
There was a brief period where their supplier installed the sleeves on with crazy glue, and gasoline dissolves crazy glue.
You can either put some sealant, you can epoxy them, or you can install a regular o-ring on the injector itself inside the sleeve.
Just be careful not to get anything on the nozzle plate.
If I remember correctly we used an o-ring on the inside to fix the issue. It was causing a leak when we smoke tested the system.
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Old 03-13-2013, 07:59 PM   #13
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As I said. O-ring and seal all. Use two small prongs per injector, chrisk should have them.

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Old 03-13-2013, 08:09 PM   #14
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As I said. O-ring and seal all. Use two small prongs per injector, chrisk should have them.

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They have been sent to Chris already. Hopefully that takes care of my lean problem and fuel smell!

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Old 03-13-2013, 08:35 PM   #15
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You might want to check them. Just got off the phone with HPF, they said the don't even use them anymore because of issues they are having with them.

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Interesting. Maybe they replaced them when they built the motor last year, but I don't recall seeing them on the parts list. I'll have to check.
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Old 03-13-2013, 10:03 PM   #16
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They have been sent to Chris already. Hopefully that takes care of my lean problem and fuel smell!

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Awesome, it should, when that happened to me it caused a lot of problems. Crappy idle, lean, fuel smells. When do you go lean?

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Old 03-13-2013, 11:42 PM   #17
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Awesome, it should, when that happened to me it caused a lot of problems. Crappy idle, lean, fuel smells. When do you go lean?

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At full boost...then my knock siren goes off. Did you change them out or just resealed them?

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Old 03-14-2013, 07:36 AM   #18
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At full boost...then my knock siren goes off. Did you change them out or just resealed them?

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I just resealed them.

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Old 03-14-2013, 12:32 PM   #19
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Originally Posted by GRK///M3 View Post
The fuel rail was holding them together...the problem was fuel vapors/mist coming (under boost) from where the sealant/super glue was supposed to be. In the pic you can see a yellowish stain on the head behind the fuel injectors from the gasoline being sprayed onto it.

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I think your o-rings where to old...
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