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