I should have also mentioned earlier, there is an "effective serial number range" for this modification:
163.154 (ML320) up to A266446
163.172 (ML430) up to A265965
163.174 (ML55) up to A266484
16ue, are you the original owner?
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I was told that the fuel filter update will be done under warranty if the job is being done on-schedule (as Doc said) AND if the truck is owned by the original owner.
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Furthermore the job more than likely was NOT being done on schedule, as it is due every 60,000 miles OR 4 years (truck is a 99 so in the very least should have been done last year at some point, unless it is a 98 build date, in which case it was due in late 2002. So you were at least a year overdue, probably more.
The pump replacement isn't a requirement for the filter upgrade. MB lists different warranty times based on if the pump and filter is being replaced/upgraded, or if it's just a filter upgrade.
Gilly