Fuel Pressure Regulator location

[Caprimaniac]

Originally Posted by Snakebit

I have a Mallory bypass regulator mounted before the Webers (see pics in gallery) using an Edelbrock machanical 7psi street pump. The regulator is set at 2 3/4 lbs. If the pressure exceeds the preset amount the diaphram opens and allows the excess pressure to bypass back to the tank. Is this correct, or is the last carb getting less fuel presure than the first?

Hi.
I use the same set- up. 3/8" tube (AN6) from Summit fuelpump.
Goes into Aeromotive fuel regulator (comes w/ 2 springs: 1 for carb, 1 for injection. Also for turbo- /supercharging).
From there splits into two, one line (AN6) to each row of carbs.
Return line is 1/2" (AN8).

PS: A friend of mine tried smaller return line and got into trouble. Fuelregulator didn't bring pressure down to 3 PSI, not lower than 4. Resulted fuel overflow.. Changed to 1/2" and it was all smooth.
He did have a pump with rather high flowrate end pressure, so it all depens on. Anyway the return line has to have capacity enough to drain out the excess fuel.

Never found any issues with front carbs. Should work as GAZ zez... Unless the pump cannot hold up for the fuel demand.... Then the front carbs will get into trouble, as far as I can tell.

Runes

[fordracing65]

What regulator does anyone recommend for a 427 fe. I heard the Mallory 4309 is often used. Anyone use it.

[Gaz64]

Originally Posted by fordracing65

What regulator does anyone recommend for a 427 fe. I heard the Mallory 4309 is often used. Anyone use it.

That's what I use on two cars now.

Originally Posted by Gaz64

I run a Mallory 3 port bypass regulator.

My system is plumbed splitting the main supply line to the rear carbs, then to the front carbs, then off the front carbs to either side of the reg, then out the bypass and back to the tank on the return line.
My pressure gauge is mounted on the side of the regulator.

My reg is mounted after the carbs as above, with a bypass reg this is the best way, that way the carbs are getting fresh unheated fuel.

[fordracing65]

Originally Posted by Gaz64

That's what I use on two cars now.

Ever have any problems with it. I can get one for $60 brand new.

[Gaz64]

Originally Posted by fordracing65

Ever have any problems with it. I can get one for $60 brand new.

No issues with mine.

One runs at 3.5 psi, the other runs 6 psi, both from key on to redline.

Easy to service, diaphragm kits available.

Gary