I run a Carter 4070 which is a 12 volt pump, but Carter has a 6 volt pump, the 4259, 5.5 psi max pressure so it probably runs 4 psi real world which means no need for a regulator. Under $100. See below.
https://www.speedwaymotors.com/Carter-P4259-6-Volt-Electric-Fuel-Pumps,8837.html?sku=9104259&utm_matchtype={match_type}&msclkid=995b198ff74f1ca3224c7cbd5d659ac7&utm_source=bing&utm_medium=cpc&utm_campaign=SMI%20-%20Shopping%20(CSE)%20(Bing)&utm_term=4577129469001644&utm_content=All%20Products%20II%20(Feb28_2020)
My grandfather had a 1925 dodge that he loved to drive but fuel delivery and reliability on that motor became an issue. I installed an electric pump and regulator. The car was 100% original. No one cared. No one. And he never had any problems or failures whatsoever in the years he had to enjoy the car.
No one will care if you install a electric fuel pump on your truck. No one. So eliminate headaches and use a fuel pump block off plate and forget it.
Install the pump near the gas tank, and use the Carter rubber isolators for a quieter experience. Also, install a metal inline fuel filter between the tank and the pump. The Carter pumps use the fuel to cool the motors and junk from the tank can jam them up.
As for wiring, if you can find a 6 volt relay, wire the pump through a relay to keep the higher amp draw outside of the cab and entirely in the engine compartment.
Use a Carter pressure safety switch. It does not take much cranking at all to trigger the switch, 7 pounds.
https://www.summitracing.com/parts/crt-a68301If your motor stops running for whatever reason, motor shuts off unexpectedly, accident, fire and you shut the motor off, fuel does not keep pumping. A good safety feature. I have run this style set up for over 40 years (and still do).
