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i have a 83 6.9. Lift pump is an electric in line and has worked good as long as I have had the truck. Lots of fuel at the schrader valve on the filter. I started the truck after a big dump of snow to move for plowing. Had it idling for about 10 min while shoveling it off. Went to move the truck and it just wouldn’t make any RPM eventually it wouldn’t even idle without full throttle then wouldn’t even start. Still lots of fuel from the electric pump. Right before this it was starting to get a real bad surge if you were just rolling down the road barely giving any throttle. It would smooth out when I would give it more throttle. Also seemed to develop a bit of a rough idle over the last few times I drove it. It’s just my bush/sledding truck so it doesn’t get used a lot. Thanks for any help.