TOM.DK

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You MIGHT not be aware either!
Stumbled across a Service Bulletin (SB) from Precision that is intended for Certified Aircraft. A gasket under a plug in the Fuel Injector can come Loose during use if a certain rubbery type gasket is used. Mine was brand new, but made around 2007. My plug WAS Loose (!), and with the wrong type of Gasket. The correct gasket (steel) was located at Air Service International @EKBI - helpful as usual - and installed as per Mandatory SB PRS-107 rev. 4.

http://www.precisionairmotive.com/Publications/PRS-107 Rev4.pdf