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Your cart is empty.Holley fuel pressure regulators are designed to precisely control the fuel pressure from the fuel pump to the carburetor. Too much fuel pressure for a given needle and seat assembly can overload the needle and seat and may cause flooding or drivability problems. Each Holley fuel pressure regulator is fully adjustable so regulating the fuel pressure to your engines needs is a simple task. All Holley regulators are pre-set at the factory at 2.8 PSI so there is no guesswork when first installing the regulator. The Holley 12-804 fuel pressure regulator features 3/8" NPT in/out ports.
Customer
Reviewed in Mexico on June 25, 2024
Siempre uso esta marca por lo confiables que son
Client d'
Reviewed in Canada on November 2, 2024
7 PSI avant et 7 PSI apres déterré au maximum obtenu 4 PSI j'ai besoin de 2.5!!! ce régulateur est un 1-4 PSI !!! j'aimerais un remplacement par une pièce qui FONCTIONNE!!
Jason W.
Reviewed in the United States on October 31, 2024
The regulator worked for what I used it for. I put it on a Polaris Ranger 500 4x4
Customer
Reviewed in the United States on August 7, 2023
Bout this for our Micro Sprint race car to control pressure on our carburetorsProbably not using for its intended use (gasoline) We're running methanol and it works flawlessly
LEE
Reviewed in the United States on February 4, 2023
Great product from holley, but these do not come with the supplied tap that's suppose to be in box for the 2 machine screws that mount the regulator to the bracket. Somewhat of an inconvenience but that's why it's probably cheaper than other places selling the same part number. There's always a catch with bargains
Dexter
Reviewed in Canada on January 31, 2023
Worked great for my Fuel injection to Carb conversion on my Volkswagen Vanagon
Sabrina Reyenga
Reviewed in the United States on July 9, 2022
I installed this on my Onan 7000 generator as part of a project to resolve vapor lock issues in hot weather and high altitudes. The project involved installing a 250LPH electric fuel pump on a relay system and then T off to a bypass line and a fuel pressure regulator on the fuel line going to the generator. My bypass line has a shut-off valve that I can use to manually adjust the pressure, but when air bubbles develop within the input fuel line, this valve requires adjustment to maintain the fuel pressure. My plan was to install a fuel pressure regulator on the line going to the generator so that the bypass valve needs less fine tuning to maintain the same pressure in all temperatures. Unfortunately, this fuel pressure regulator does not even come close to regulating the pressure and keeping the pressure down. I feel lucky that this did not damage my generator because at one point I saw 30lbs of pressure while trying to start the generator. This was the second pressure regulator that I have tried. The first regulator was made by Mr. Gasket but had the opposite problem where no matter how high I adjusted the pressure in, I could still not get any fuel pressure to the generator in hot weather. When the air temperatures would get high, the pressure would start dropping until the fuel pressure gauge would read zero. The generator would continue running for a while but would eventually shut down completely. In the hottest temperatures the generator would restart after a few minutes but would shut down again within 10 minutes or less.
Ronald A Johnston
Reviewed in the United States on August 14, 2021
Quality fuel regulator. Good value don’t buy the cheap dial types they leak gas. By this one instead it actually works and it holds up
isiton?
Reviewed in the United States on September 4, 2017
I had a chrome dial regulator, which leaked gas everywhere but luckily didn't actually burn down my ride. Then I got this good one, to try to get 1.5 PSI to the Kadrons. At first it seemed fine, set it to 1.5 PSI and away we go. Got a gauge on the FPR to monitor, and at first it was great. Later, every time I checked it, I'd get a different pressure...[Edit to update: This FPR didn't fail after all! What happened was that I was using a liquid filled pressure gauge, mounted in the engine compartment. It got hot, and gave a wrong reading. Got a regular non-liquid filled gauge, and it's great. Regulator was fine all along.]
Motorhead
Reviewed in Canada on March 31, 2017
This is a good quality regulator and works great on my V8 Flathead Carb . bringing the fuel pressure down to 2 1/2 psi . Fast delivery and because of where I live off the beaten path , a potential delivery problem was resolved for me in a quick and pleasant manner by Josh of JBs Power Centre . I will shop here again .John B
Martyn Baylis
Reviewed in the United Kingdom on January 31, 2016
took a long time to arrive. Product very good
Leonard D. H
Reviewed in the United States on November 26, 2014
I am using it to reduce fuel pressure to a Weber 32/36 DGEV Carburetor. It is designed to feed two carburetors. I plugged one port off since I only have one carb. I could have plugged a gauge in the unused port, but I already had an in line fuel pressure gauge set up. Also, with the regulator on the firewall, the gauge would have been hard to see unless I rigged up another line. The ports are 3/8" NPT threaded fittings that do not come with it. Setting the fuel pressure is real easy. It takes large turns to change the pressure (not very sensitive). Maybe a full turn for one PSI or so.
Road Runner
Reviewed in the United States on October 16, 2010
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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