Live and learn, I guess.
I still have a couple of questions about this.
1) I know of two (2008 and 2009) E350s that needed the "leaking fuel sender fix" done. Both were under warranty. Both were fixed by replacing both sending units and pump. And from what I was told, there is a right and left pump attached to the right and left sending units. But maybe the pump is only on one side of the two sending units.
Here are the 2009 E350 OEM parts (with numbers) for driver and passenger side units:
Mercedes Benz E350 Fuel Pump - Auto Parts World
Anyway, the tank was not removed. Did MB move to metal tanks in mid-production or something? And what did using a steel tank do to change the design of the fuel senders? The part numbers haven't changed with any facelift model years of the E Class.
Could the OP post the build date of their car (it's on the mfg plate on the door sill.)
2) Does MB Assist require that the car is towed to a dealer only? I know that they changed the rules for lifetime assist and still offer it providing you have used a dealership at least sometime during a calendar year, right? But has it always been towing only to a dealer?
If the OP could please post the work order with parts numbers after they get the car back, that would be really helpful to members. And also what codes SDS showed. Thanks!
EDIT: I found this on another forum about a 2007 E350:
"He did the diagnostic(he has a laptop that he hooked up to the car) and told me there is a problem with a fuel pump. I called a dealer and was told that its not sold separately, but only with entire fuel tank, which retails $1,800. Do any of you know or could suggest any cheaper solution to my problem? Is there anything else could be done instead?"
The response was the same as here: a) doubts that it was the pump itself b) the tank doesn't need to be removed to replace the sending units. c) it's probably the crank position sensor
But then the OP never posted what the issue turned out to be....... but the
dealer did tell him that the tank needed to be replaced, too. And that was on a 2007. I know somebody who had sending units replaced on a 2007 E63 and did not replace the tank, just the pump/sending unit assembly. I'll try and get the work order info from them.