What an interesting idea. using an electric pump that works just like at least 50 million vehicles on the road.

The fuel injection systems usually are either around 15psi (TBI) or 50psi (MPFI). That basically tells you what the pumps are pumping into. The pressure in the line is determined by the regulator at the end of the line. The pump produces a pretty constant flow and the regulator modulates the pressure in the line by how much fuel goes back the return line. In the last few years there have been designs that don't use a return line and regulate the pressure at the pump. There have also been systems that modulate voltage to the pump to reduce flow in times of reduced demand.

On some pickups where the body didn't change but the fuel delivery system did, it would probably be easiest to buy a new tank intended for fuel injection so the right baffles, etc were already there and the tank was set up for an in tank pump/filter/sender module.

The tanks for electric in-tank pumps are not that complicated, usually they have a simple plastic baffle around the pickup strainer.

In general I'd favor a pump for a TBI system.

R.