Right above the upper radiator hose- is this temp gauge? I've got a leak and it appears as though it is coming from this fitting. I run biodiesel and believe it is a fuel leak but am not certain- the wife's car, just glanced at it the other night.

I wasn't sure if this sender goes to the fuel somehow because I know my motor has a fuel pre-heat loop by the coolant. Either its this sender or the primary fuel filter which is just above it and to the right in the photo. Or its engine coolant but it sure doesnt smell like that.

I wiped it with a rag before I took this pic, the fluid was laying in next to the sender.

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1995 E300 diesel