Don't replace the pumps until you have ran a fuel pump quantity test to verify either a possible restriction or weak pumps. Fact is pumps are about $130/each, you won't really find much of a "deal" on them.

I did an article on it here:
http://www.w124-zone.com/articles.php?article_id=48

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
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2003 Gray Mercedes ML350 - 122k