Holley 12-804 Fuel Pressure Regulator


Customer Rating :
Rating: 4.2

List Price : $34.13 Price : $27.95
Holley 12-804 Fuel Pressure Regulator

Product Description

This regulator is used to adjust to fuel pressure requirements of various carburetors and supplies the proper pressure to the needle and seat valve to prevent flooding or drivability problems. This satin finish regulator feature 3/8 pipe thread outlet ports with 7/32" restriction. It regulates pressure from 1 to 4 PSI and is designed to work with a single carburetor installation.


  • 3/8" pipe thread ports
  • 7/32" restriction
  • Pressure ranges from 1 to 4 PSI
  • Includes mounting bracket
  • Satin finish


Holley 12-804 Fuel Pressure Regulator Reviews


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Average Customer Review
6 Reviews
5 star:
 (2)
4 star:
 (3)
3 star:
 (1)
2 star:    (0)
1 star:    (0)
 
 
 

16 of 16 people found the following review helpful
5.0 out of 5 stars Nice low-pressure fuel pressure regulator, December 3, 2008
By 
bjm "bjm" (San Salvador, El Salvador) - See all my reviews
This review is from: Holley 12-804 Fuel Pressure Regulator (Automotive)
The Holley 12-804 fuel pressure regulator actually operates in the 1 to 4.5 psi range. It's the Holley 12-803 that ranges from 4.5 to 9 psi.

The unit sits on it's own chromed mounting bracket that can be attached to the firewall or near the inner fender wells of the engine compartment. Loosening the lock nut on the top and turning the allen head screw, it is possible to adjust the fuel pressure, though you will need a fuel pressure gauge attached to calibrate the setting. To do that, it's convenient that there are two outlet ports. One can be the fuel outlet to the carburetor. The other can be where the gauge is attached. The fuel inlet from the pump is on the bottom. Each of these ports is a 3/8" NPT thread, so brass hose fittings can be installed. The second outlet port can be plugged if the gauge is removed, or can be used to feed a double carburetor installation. I understand that the initial factory setting for the fuel pressure is 2.7 psi, but that should be... Read more
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5 of 5 people found the following review helpful
5.0 out of 5 stars very dependable fuel pressure regulator, October 16, 2010
By 
Road Runner (El Dorado, Ca.) - See all my reviews
Amazon Verified Purchase( What's this?)
This review is from: Holley 12-804 Fuel Pressure Regulator (Automotive)
I have purchased several of this regulator for my cars built prior to 1940 with excellent results. They come pre-set at 2.7 which works perfect with Webber 32/36 Dav, strombery 97, holley 94 and other early Ford vehicles. It is used exclusively by the California Auto Museum in Sacramento, Ca. after they found many other regulators were not dependable plus other problems such as gas leaks, etc. If you need pressure below four pounds and the size of this items will fit in your configuration, buy this item. Do not buy plastic fittings for any regulator used as they just do not seal properly.
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7 of 8 people found the following review helpful
3.0 out of 5 stars Regulator Needs Minimum Flow to Regulate, September 30, 2009
Amazon Verified Purchase( What's this?)
This review is from: Holley 12-804 Fuel Pressure Regulator (Automotive)
While delivery was great and the description was spot on, this little device wasn't what I needed for my application, as it requires a certain minimum amount of fuel flow in order to regulate. When used in a minimum pressure application (in this case, 1.5 psig)when the fuel flow stops or drops very low, pressure delivered rises to the maximum of the fuel pump, which is enough to force the float valve in the carb from it's seat. This causes exactly the problem I installed the regulator to prevent. all this is probably an "off design" application (generator for an RV using a larger remote tank and small electric fuel pump)I feel that the regulator should regulate...just as air pressure regulators do for example.
In all, the application was a failure...sorry, Holley!
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