The E300 is a drive-by-wire system. So while it has a mechanical injection pump, that pump is electronically controlled. I haven't done the chip, but one of our members in the UK did and posted about it a long time ago. Try searching for E300 in the Performance Paddock.

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Rick Miley
2014 Tesla Model S
2018 Tesla Model 3
2017 Nissan LEAF
Former MB: 99 E300, 86 190E 2.3, 87 300E, 80 240D, 82 204D Euro
Chain Elongation References