I would like to add a 6 volt electric fuel pump to my 1935 Buick Series 40. Can anyone tell me what they have done. Have you used a 2 to 4 psi pump or a 4 to 6 psi pump? If I by pass my current mechanical pump, what would you recommend? If I put it in line with my current mechanical pump and run the fuel through it, what would you recommend?