Even with them being just up the road, I'd prefer order elsewhere online for most everything.

As to the fuel contamination, if you haven't already done so, find some StarTron diesel fuel additive. It has many rave reviews here on the board, as well as over on the BenzWorld board.
From all I've been able to understand of it, it helps to break down the dead critters in the fuel once it kills them off, instead of just letting them settle and plug everything up.

In my area, I found it at the local West Marine boating shop, and nowhere else. Your mileage may vary though.

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-Josh
Testing the cheap Mercedes axiom, one bolt at a time...