Holley Fuel Pressure Regulator Identification

[chris401]

I have an old regulator that I need some information on. Tried Holley off and on but never get the promised return call or email. I know this casting number was used on a couple different models. Casting member is 34R-6657B. The number on the adjustment side is R-3-3
Thanks

Anyone know which one I have?

Is it a return type?

What is the minimum to max pressure range?

EDIT: I am pretty sure it is a return type. The IN arrows pointing up to the adjustment screw had me wondering if was part of another system that was pieced together. Nothing appears out of place or changed that I can tell.

[jayb]

I don't think that's a return type, looks like a normal dead-head regulator to me.  Not sure what the pressure range is but I would guess around 2 to 10 psi.

[BattlestarGalactic]

Looks like a std regulator to me.  NOT a return style.  The return style has more openings.
If it is old, get a replacement diaphram for it as it will crack if you adjust it after it gets too dried out.

This is what my Mallory return regulator looks like:  The bottom hole is the return line on this.

[chris401]

It has the two IN ports directly across from each other and a third port T'd out on the bottom between the mounting screws where the ball and spring are.


This thing has been sitting for 6 years that I know of. Rebuilding it is good advice. I saw a few kits that come with a high and low pressure spring. Not sure which one to get.

[BattlestarGalactic]

That little arrow at the bottom, that is the inlet.  The two small ports go to the carb.  It is not a return regulator.


Here is the best picture I could find in a quick google search.


Here is a Holley picture



Rebuid kits:  I suppose the two springs that come with some kits is for different pressure levels. 
https://www.holley.com/products/fuel_systems/fuel_pumps_regulators_and_filters/fuel_system_components_and_service/regulator_repair_kits/

With a carb, 6-7 lbs is all you need.

[chris401]

That little arrow at the bottom, that is the inlet.  The two small ports go to the carb.  It is not a return regulator.


Here is the best picture I could find in a quick google search.


Here is a Holley picture



Rebuid kits:  I suppose the two springs that come with some kits is for different pressure levels. 
https://www.holley.com/products/fuel_systems/fuel_pumps_regulators_and_filters/fuel_system_components_and_service/regulator_repair_kits/

With a carb, 6-7 lbs is all you need.

Thanks,
     Didn't see that picture but it makes sense. I mis posted, I am going for 3 to 4 psi. I didn't know which kit to buy that would fit my regulator.

In the future I am piping in a return line to the tank on my daily driver, right now just using what I have.

[cammerfe]

That little nipple shown on the Mallory is a boost reference point. With a blown application, a line from the carb hat or the FI box will offer a chance to add the boost pressure to the fuel pressure to keep you from going lean.

KS