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Car is a Audi S5 2008, direct injection, 8 cyl.

I will be removing the intake manifold to clean the intake ports of carbon. In the process, the fuel rail needs to be removed. The injectors aren't screwed down, so some may be stuck and come out of the intake port, while others will only be removed from the fuel rail.

The seals only come as a kit (pieces 5,6,7,9 of the diagram), and are quite pricey. Should I replace all the seals, even if they're not damaged? Will I be asking for trouble (fuel/vacuum leaks, performance issues) by re-using the same seals?

Thanks

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tgun926
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1 Answers1

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tl dr: Replace the old o-rings

I would suggest you don't have to replace them, but I would replace them anyway. If they are the original ones, they are probably around 9 years old. At this point, the rubber is probably very hard. Secondly, you've probably already nicked a couple of them, which means they'll leak unmetered air into the intake system. This would be VERY hard to account for and even harder to find, which will make your engine run poorly. You will not regret replacing with new. You may regret not.

It looks from the diagram these are the typical o-rings used on most modern day fuel injectors. Finding the correct o-rings should not be an issue, as most any parts store is going to carry them.

Pᴀᴜʟsᴛᴇʀ2
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