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hook up an air hose and put 2-3psi into the fuel tank. then look at all the fuel lines.

mike, one of these days, we need to write up a checklist for these issues, including pics of the areas in question and post it on the site. I'll be happy to do it, but we will need pics of unmolested trucks since i just us a manual switch and the changes under my hood would throw some people off.

if that relay works, you will hear the click from inside the truck, its very pronounced. you can also try bypassing the temp sender that might be the issue. next time the truck doesnt want to start, take a short jumper wire and jump the two wires that attach to the screw-in plug near the front...

first, do you hear a click when you turn the ignition on, if you dont, the glow plug relay on the firewall is acting up. if you hear the relay when you start it cold, but not after its been running, the there is a temp switch that has gone bad.