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Removed vent line valve and found it to be completed clogged. Truck now runs fine. Will change out the fuel tank when I run out of other things more important to complete at the moment. Thanks to all for your input.

Thank you for the suggestion but the forklift scratches are superficial and two years old. The tank collapsed just a few days ago.

I have a NOS fuel tank to replace it with, but still need to determine the cause. Will start by inspecting the vent line as suggested by Coug. No doubt the fuel pump is a good one, as CAMO said. One thing for sure…the entire fuel system is air tight! This is one for the books if even Steve/RWH...

Experienced “fuel starvation” symptom of reduced power requiring increased throttle to maintain speed. Was able to make the trip back to my shop, but just barely. Humvee still starts immediately, idles without a problem. Was looking under the truck today and much to my surprise, noticed the fuel...