No worries mackhack. Just seemed like from your recent post I would have to find an alternative solution and I wasn’t trying to be a pain.

Please relook at the revised schematic. Relay solenoid is powered by the front SAM and triggered by the Motor Electronics, not the rear SAM; I misread the schematics on my laptop many months ago but have since corrected it. My bad for the earlier erroneous information. See here:
https://mbworld.org/forums/w211-amg/...ml#post8120332

Rev 1 (early model year 2003): fuel pump relay in trunk with integrated fuse. Air pump relay under hood over auxiliary battery. Fuel relay single triggered by ME.
Rev 2 (late model year 2003 and model year 2004): fuel pump relay in trunk with separate fuse. Air pump relay under hood over auxiliary battery. Fuel relay single triggered by ME.
Rev 3 (Model year 2005): fuel pump relay and air pump relay in trunk with separate fuses. Fuel relay single triggered by ME.
Rev 4 (Model year 2006): two fuel pump relays in trunk plus air pump relay in trunk with separate fuses. Fuel relays each triggered on separate pins of ME.

FWIW, in model year 2007 the E63 version of the W211 went to two each fuel pump controllers that vary fuel pressure based upon a Pulse-Width Modulated signal from the Motor Electronics.

In 2019 I had my fuel tank replaced in my '05 E55 under warranty due to the smell inside the car. Within a year my fuel pump failed and Mercedes charged me $3000 to replace pump and harness. My question is, when they do major work like this, how come they don't install new pumps, but instead put the old ones back into the new tank? Well guess what, my pump just failed yet again and it's past the 2 year warranty. Have to come up with another $3000! What the hell. Why in the world would they put the old pumps back in I will never know. Would love to get reimbursed somehow for this BS! Would love to hear replies about this. Thanks guys.

I was under the impression that they were supposed to replace the entire tank with everything in it.

That's what I thought until the service agent said pump not included to be replaced. So when my pump failed again the other day the steelership wouldnt give me the time of day. They brushed me off saying latest pump failure is out of the 2 year warranty period. But i want some money back if the pump was included when the tank was replaced and it failed within a year. Hopefully i csn get some real answers on what parts are all included in the gas tank replacement. Ugh!

I've been going nuts trying to find out what parts are in the the fuel tank system. The part number is 211-470-03-00, which has been discontinued everywhere I go online. So there has to be the info I need to prove that part was replaced. They consistantly tell me that the pump wasnt replace. Am i to believe that they will replace the entire fuel tank system, and put the old pump back in? Im no idiot. The Paramus service depart in NJ appear to be clueless, and it really pisses me off. I'll go there in person tomorrow and talk to the parts person and get the list of parts in that system. I hate dealing with morons.

I am pretty sure all of the original parts were superceded and none of them are forwards or backwards compatible meaning you generally have to replace everything in one go. My guess is you had to have new pumps as is supposed to happen.

I was lucky enough to be able to source a good top hat so that I could retain all the old stuff but I still needed the adapter harness for it.

Good luck on the dealership. Personally, I would not expect much since it is an older car and it's getting harder to source parts for it. Try calling FCP Euro and see what they can do to source you a fuel pump and the filter/regulator that matches. It will run you about $1,000 for the parts and you can do the work yourself in a couple of hours.
Don't forget to check the relay and all connections.
EDIT: are you sure it's the fuel pump and not the relay? First thing I would check for a fuel pump failure is the fuel pump relay or the connector that attaches to the fuel pump top hat.

sorry, posted too quick, need to edit