I have never heard of this fuel filter!?

Can anybody else confirm that this is on all M103's -- Early and late?
If so, this could be my rough idle/poor MPG problems...

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k