If it were my car, I’d throw away the flame trap screen at a minimum. Did that on my 240 and 850 with no issues. You could also throw away the entire flame trap and replace with a hose as you more or less mentioned.
If you are willing to go down this road, you could also try Auto-Rx. Might help. An excellent sludge cleaner. Used it on my 850.
Out of curiosity - Did you ending up replacing the rear cam seal? Was it the cam positioning sensor that was in the way?
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Will I buy another Volvo??? We'll see....
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