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Art, here is a link to an old post by FitzFitzgerald, whose advice I always trusted; it may be the source of my belief in that TSB: http://www.brickboard.com/RWD/index.htm?id=1107930
The pertinent bit is right at the end: "...don't ever install the little screens in the flame traps. There's a Volvo Technical Service Bulletin that advises discontinuing their use. Their purpose was to keep a backfire from going from the intake manifold backwards into the crankcase and igniting the oil vapors, but when was the last time you heard a fuel injected engine backfire? The screen is only useful on the carb'd engines which we didn't get in the US markets."
A search turns up many posts referencing the Technical Service Bulletin from Volvo, but I have not yet found actual proof. Could this be another forum rumor that has been repeated so many times it is considered fact?
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