Just bought a beautiful one owner 110K, '99 E300D that was garage kept and had all the receipts since new. Ran perfect for exactly one week, then refused to start, cranked and cranked, no start. Only problem with the car was a leaking plastic fuel line from the filter to the SOV. Noticed small amount of fuel on the ground and below the SOV at this time. So I ordered and replaced all the plastic lines, SOV o-ring, the filter and pre-filter (w/oring) last night. Cranked and cranked(5 times) on a level surface with 1/2 tank of gas and still no start. Checked the SOV and it is clicking so it should be fine and I assume the K40 is working ok if it clicks. I noticed fuel in every line except for the line from the heater to the pre-filter( Line 1 in diagram), it is completely empty. Does this indicate a problem with the heater itself or the fuel lines to the heater? Do you think the in tank filter suddenly clogged? If so would I not have seen a bunch of junk in the prefilter/fuel filter? What is the next troubleshooting step I should take or part I should replace?

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