recommended fuel pressure for a carb? (electric pump)

[Sport340]

just need to know what fuel pressure i would need to feed my carb happily? i have a 340 ....

i want to get rid of the mechincal pump and get and elctric one so i need to know


would 5 psi be too low?

anyways. thanks alot.

5 psi ought to be fine, I wouldn't go over 6.

[Dr. Righteous]

I know Edelbrock Performers mandate no more than 5.5 psi. I run a Carter electric fuel pump and it is dead on 5 psi all the time.

[djswwg]

As the good Dr. said, it does depend on the carb. Holleys like a little more than the others, about 6-6.5 for 750 cfm or smaller, as much as 8.5 for 850's and bigger. Trial and error with a good ajustable regulator and gauge will tell the final tale............djs

[HOLESHOT]

LOOK FOR RESTICTIONS FIRST,SUCH AS FITTINGS THAT YOU CAN DRILL OUT LARGER,THEN IF NOT MUCH IS FOUND(CHECK THE FILTERS) THEN GO AS HIGH AS 6.5-7 WITH A REGULATOR ,BUT YOU DO NEED A GO NEEDLE AND SEAT.EVEN THAT SHOULD NOT BE OVERLOOKED FOR FUEL FLOW ISSUES.A GOOD 340 WILL EASILY TAKE 6-7 PSI.