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Nice. Glad you got it figured out.

I'm not sure that diesels can get vapor lock, but yes perhaps as the tank empties it isn't venting from the cap as it should, and creating a vacuum situation, which is going beyond what the lift pump is capable of overcoming. Seems reasonable, and would "seem like" a heat issue when it's simply...

Replace the small length of black rubber fuel hose in front of the air filter going into the IP with clear fuel hose. If the truck starts stalling go look at it and see if you've got air bubbles or no fuel coming in. Just a thought.