i run about 6.5psi as for an electric pump
http://www.gsl392.com/ this one is very quiet cheap and very durable and will support 600hp. to run this pump you will need to run a return line and a bypass regulator . the 392 pump is very famous with the turbo crowd as you can stack them. there is also a carb style that runs at 14psi this can be run with a deadhead regulator but is not recommended .a return line should be run with any e.p. to reduce heat and strain on pump and vapour lock . this set up will produce rock solid fuel pressure. if you want to know how i ran my return line let me know
