Sounds like that Delco electric lift-pump to me. Note though I have had a few trucks with an intake-sock plugged, inside the tank -with diesel-bacteria. Both of them were farm trucks. Hopefully that's not very common with trucks run on fresh highway diesel.
The Delco EP-309, EP-158,GM 25115224, Carter P74001 pumps, etc. used OEM are known for such problems. I know a few people that carry spares.
I don't use either anymore. Walbro makes one that is a totally different design much more rugged. #1 choice for people using "questionable" fuels, as well as good highway fuel. Walbro FRB-5. It costs more, but worth it - in my opinion.
I'm not trying to get you to change pump designs; just mentioning my personal choice. I'd take a mechanical pump, or the Walbro over any of those frame-rail mounted vane-pumps.
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Today's Featured Article - Fasteners: The Nuts and Bolts of Nuts and Bolts - by Curtis Von Fange. The nuts and bolts of nuts and bolts is an interesting and essential piece of knowledge that applies to our older tractors. An improperly torqued capscrew on an engine head or a shear bolt that is too hard on the driving shaft of a bushog can create havoc and make an expensive and uncalled for repair. Let�s examine the purpose and design of these fasteners in order to ensure their proper use. Fasteners are probably one of the aspects of mechanics that is given the least amount of thought.
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