Factory fuel injection 5.2 magnum using external electric fuel pump ?

Is it possible to do Factory 5.2 magnum fuel injection just using an external electric fuel pump ? Would it cost more ? How much PSI does the 5.2 magnum system need ?

I run an in tank pump to a front mounted surge tank with an internal pump. This set-up removes any air from the system that may be sucked up when the tank is down to the last few gallons so it won't get passed to the injectors.

Both pumps are powered by the factory fuel pump relay circuit They run for about a second before cranking when the key is turned to the run position. My Start 1 and Start 2 12V are spliced together.

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