I had this happen also and it stopped after the dealer replaced my evaporation cannister.
Dear Mercedes List,
>
>
> In February of this year I became the proud owner of a 1997 E420 >
> Mercedes. What can I say? A very smooth, powerful, and beautiful >
> car.
>
>
> Today, while driving, the fuel light came on and it was flashing, EVEN >
> though the car had an almost full gas tank. The flashing light came >
> on a few times before, but every time it did in the past, the fuel >
> tank was closer to empty (even though I still had at least 5 more >
> gallons) and so I ignored it. Today it was different and it makes me >
> wonder what could be the problem: fuel filter? air intake? Has anyone >
> experienced this before? The car's manual only says the light comes >
> on (not flashing) when the tank has less than 2.6 gal., which was >
> clearly not the case today.
>
>
> Any input or feedback would be greatly appreciated.
>
>
> Sincerely yours,
>
> Darian Muresan (darian at dmmd dot net)
>
>
> 1997 E420
>
> 1967 240D
>
>
>
>