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It's not hat big of a job, actually. The sensors (one for each half of the "saddle" tank) are accessed through the rear seat and you don't take the tank out of the car. You do have to drain the gas, however.
I didn't want to muck about so I had my mechanic do it, and it's a reaonable 1.8 hours labour to drain/fill the tank and R&R both sensors. One (I think the right) is the culprit, but it would be nuts not to do both.
I don't have the parts numbers handy, but Fastlane sells them as they're a common replacement part on W202 cars.
The trick in the repair is knowing that the sensor is part of the evap system and it can cause a leak in the system, meaning the flashing reserve light and eventual CEL. You check the other valves first, and if they're working, then odds are it's the fuel level sensor.
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