There appears to be some parallel discussions occurring, which may have caused confusion.

To continue that trend, I wanted to emphasize JayBob's post above regarding cleaning the sender. The idea to test the sender outside of the tank is very smart, and something I missed entirely. To test my Reserve light after cleaning my unit (it contained some black/green slime), I kept driving one day until either the Reserve light came on, or I ran out of fuel. I was carrying a spare gallon in the trunk just in case, but testing it outside of the tank would have been a wee bit smarter.

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1968 220D, w115, /8, OM615, Automatic transmission.
My 1987 300TD wagon was sold and my 2003 W210 E320 wagon was totaled (sheds tear).