Fuel pressure dropping while driving and under acceleration to zero at idle runs 4 lb electric Blue

I can't tell for sure but it looks like the pump is mounted AHEAD of the axle. And you essentially replaced the fuel line from going up and over the axle to now coming straight from the tank, under the axle, and into the pump. If you've already plumbed it, I'd give it a try.
If it still has issues, make sure you minimize any restrictions ahead of the pump - be it fittings, filters, or whatever. If all that fails, then I'd move the pump behind the axle on the rail for a very short shot right into it out of the tank.
Sorry for the bad picture. The picture I posted shows the supply line coming out of the sending unit going up following the wheel well back down the frame and into the pump. That is how the setup is now. I was wondering if I shorten the distance and go straight from the pump over to the sending unit with a short piece of hose if it would make the same difference as moving the pump closer to the sending unit with a short line