“I friend of mine has a 98 blazer that will not start in damp weather. Here’s the kicker, it has spark to the plugs.” I assume that means it has spark to the plugs when you checked it. Was it in a no start mode at the time? Until you can replicate the no start mode you are chasing ghosts, Try an approach of a spray bottle of water when the engine is cold to the wires etc. to see if you can replicate the problem, or check it out when the no start problem occurs. Really sounds like electrical problem rather than fuel problem to me.