Compression Ignition Addict
Join Date: Dec 2007
Thanked 311 Times in 300 Posts
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Could it possibly be cold enough, where you are, to actually gel? ULSD won't gel easily, not sure without the Winterblend what that would be but I'd suspect it might be in the Low Teens or even Single Digits (F). For gelling problems the next step might be to add some "Diesel 911"...
Maybe it's not fuel at all, what year is your truck?
How much Fuel in the tank?
Do you get a WTS light when you first roll-on the key?
Do you see cranking rpm on the Tach as you try to start (pre-'01)?