Holley 12-804 Chrome Carbureted Fuel Pressure Regulator

Needed a fuel regulator for my 1406 Edelbrock to turn down gas getting to it. It works great. I have put others on and they wouldn't hold the fuel pressure it was set at or hard to adjust. This is easy to adjust and stays where you put it. Easy to install depending where you put it. It hasn't leaked yet. I also put a gauge on it. Kinda pricey but it was name brand and it was way better than the turn and click ones. Happy with the purchase

Nice looking and functional!! Just what I needed to reduce my fuel pressure to the level needed for the carburetors - AND still keep that pressure up when I stomp on the gas pedal.I use 3.5 PSI, and a quick throttle hit causes a dip down to 2.5 PSI (fully acceptable!!) with a quick recovery ( < 1 second).I'm pleased with it.

This little guy cleared up fuel issues with an aftermarket carburetor on a Willys Jeep. I was able to dial down the 7psi fuel pump to 2 psi and tune the carb correctly.Once I got the fuel pressure confirmed, I removed the gauge (sold separately) and installed 3/8"-18 NPT Industrial Magnetic Drain Plug (Internal Head) IP-03 on the second outlet port.Adding 3/8" Stainless Steel (316) Mini Ball Valve - FxM NPT to the inlet allowed me to use a fuel shut off.The 3/8" inlets were problematic for my application (1/8" on the vehicle) but I found the fittings I needed on Grainger's site.

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

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

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.

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.

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.]