Running out of fuel at 40-45 mph.

[1970pelle]

I drove the truck Tuesday where I needed to get it to highway speeds. I quickly found out it would not go over 40-45 mph without bogging out. If I lifted my foot off the gas pedal and let the engine recover it would and I could go at speeds below 40 mph. It never stalled out when coming to a stop. It just seamed to not have the volume of fuel to power the truck at higher speeds.
I checked the clear fuel filter and it always has fuel in it, completely full. I checked my new fuel lines for any loose clamps, kinks anything out of sorts. Nothing found. I am running dual tanks and there switching as designed.
No gas smells or leaks on the ground or intake manifold. I do have a fuel gauge before the carb, a good one Auto Gauge(oil in the gauge). I'm thinking of mounting a GoPro under the hood and watch fuel pressure. But I'm pretty comfortable that I have a bad new fuel pump, because it recovers quickly. And my engine vacuum doesn't drop completely off when condition occurs.

What do you think ?