Owen_Dyneto wrote:
An electric pump that puts out 8-12 psi is a poor choice, especially as many pressure regulators have been reported to have poor reliability. You want a pressure of 3.5 to 4.5 psi, even 5 psi is probably OK.

Replacing undercar gas line with rubber isn't good practice. First, it's far more vulnerable to damage, perhaps leaking, from road debris, than steel. Secondly and probably a minor consideration, the rubber is actually an insulator and inhibits heat transfer from the fuel to the surrounding air flow.