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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