I think I'd at least try a little WD-40 sprayed into the air inlet to see if it would at least fire a little, that way you would know if you're gelled up or not without having to loosen injector lines and make a big mess, heck, my 300D needs ether to start below 20*F unless it's plugged in.

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1982 300DT 190K (Diesel Purge + synthetic oil=smoothness at last!!!)
2004 Ford E-350 6.0 L PSD 227K
2006 Dodge Ram 3500 SRW HO Cummins 4X4 48RE 42K (brute force tow vehicle)
2005 Scion xB wife's rolling pop can
1993 GMC Sierra C3500 6.2 142K