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Where does the sending unit enter the tank? I presume up high and the pickup tube turns down and goes towards the bottom of the tank. Can you see it? I don't know how those tabs could block fuel flow if your filter sock is in place.
In cab tank on my 75 has the sending unit up high. That is only a float on these trucks .
The pickup tube is part of the tank, down low. Don't think the tube itself is actually removable; nor does it have a filter sock as far as I could see(and the tank was close to empty)
These items were traveling along the bottom of the tank near the pick up position.
Will know for sure after a few tankfuls if they were the cause of the fuel interruption.
Thanks
Tbruz