This will keep your pressure steady and have instant pressure change when adjusting. It feeds fuel directly from the tank to the carburettor. I now think that what was happening was that there was sufficient heat in the carburettor to boil the fuel, the vapor from the boiling increased the pressure above the float preventing it from rising and shutting off the supply. It will get you close. Reviewed in the United States on January 15, 2021. The higher the RVP, the greater the tendency to vaporize or vapor lock. You would'nt just be reading the inlet pressure would you? As you can see from what it replaces - it is "hot" solvent - but not quite as hot as acetone in its ability to dissolve other things. . I tried to bring the 0-140 pressure feed regulator down to 30 by adjusting the two - to up the return flow and lower the feed pressure - but the 15 psi reg I had just worked on started to climb past 9. Gasoline was so light if you left the cap off a gallon can it would all evaporate in a few days. The BALL shuts off the fuel flow until the pressure on the other side of it lets fuel get past it to keep the pressure constant. This Holley FPR (12-804) use to be a perfect choice to solve the "too much fuel pressure" produced by the aftermarket fuel pumps on vintage VW. Octane is an actual chemical which would be at the light end of the scale for gas, kerosene would be at the heavy end. Holley Carburetor Fuel Pressure Regulator 1 To 4 Psi Bottom Inlet Sides Are Outlets from Pacific Customs Unlimited your best source for Street, Off Road, Sandrail, Dune Buggy, Manx, Rock Crawler, Volksrod, or Mud Buggy VW Parts. The ethyl acetate in the IMCT loosens hydrogen bonds on the gasoline making it easier to light to burn, but the "oil" - heavier hydro-carbon nature keeps the vapor point higher and flash point still low enough to give good performance. Copyright 2023, Antique Automobile Club of America. It works but not as well as some of the off brands like spectre. Please choose a different delivery location. Adjustable Fuel Regulation From 1 To 4 PSI .220 Inch 7/32 Inch Restriction. 10 in stock. If the carbs are drawing fuel and you lower the pressure at the reg, it should show on the gauge. Gasoline at the pump is a blend of different chemicals. So - you cannot just say whether it will work or not. 12-804 : Quantity: Share : . This part is legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles. Holley 26-137 Adjustable Secondary Idle Lever 90127547045 | eBay 03-28-2012, 03:04 AM. Worked well out of the box. Copyright 2008-2023 OReilly WARNING: Operating, servicing and maintaining a passenger vehicle or off-road vehicle can expose you to chemicals including engine exhaust, carbon monoxide, phthalates, and lead, which are known to the State of California to cause cancer and birth defects or other reproductive harm. Fuel Pressure Regulator - Walmart.com near you Brands like MSD, Flowmaster, Hurst, Accel and many more make up the offering of enthusiast-driven products to deliver robust, complete performance solutions for builders, racers, and drivers. Each Holley fuel pressure regulator is fully adjustable so regulating the fuel pressure to your engines needs is a simple task. Q: The regulator is a Holley 12-804, I was told it went down to 1 psi and I have a stock mechanical fuel pump. One must understand the chemical reactions and interactions of blending other hydrocarbons into what we call gasoline and then still have it able to have the same properties desired of the product called gasoline. Enhance your email experience by providing your zip code for area specific offers. TURNING THE ADJUSTMENT SCREW ALL THE WAY IN WILL RESULT IN EXCESSIVE FUEL PRESSURE . TURNING THE ADJUSTMENT SCREW ALL THE WAY IN WILL RESULT IN EXCESSIVE FUEL PRESSURE . Part Number: HLY-12-803. Q: Got a gauge on the FPR to monitor, and at first it was great. In the later 1960s, it was somewhat common for people who were going on vacation, in the summer, to add a gallon or two of diesel to a full tank of gasoline for their trip. Most regulators need to be flowing to set pressure. Holley 12-807 Fuel Pressure Regulator Diaphragm Repair Kit No mention of vapor lock issues, but engine de-carbon activities. Fuel pressure regulator includes mounting bracket with 2 each self-tapping screws for regulator to bracket installation purposes and 3 screws for bracket to vehicle installation.Regulatorhas a 3/8" NPT tapped fuel pressure gauge port and requires reducer 617-6157 to install the gauge. Great feedback from a knowledgeable group, guys! Depending on what kind of electric fuel pump you used you will need a regulator - or series of regulators to step down the pressure getting to the carburetor like a Holley 12-803 type at the very least. A vapor lock condition would be caused. Volatility is a measure of the gasolines tendency to vaporize under a given set of conditions. In some areas, according to the map, RVP can vary from about 7.0 to 9.0 in some of the fuels. Brief content visible, double tap to read full content. I have just this Spring started taking temp. Terms of Service. LOW PRESSURE REGULATOR 12-804 - Allstate Carburetor But, . However the part number on the box was 12-804 which should be a 1-4 psi regulator BUT the Part number etched on the unit was 12-804 4.5-9 psi which doesnt exist. 3/8 Inch NPT Ports 1 Inch 2 Out. I had a chrome dial regulator, which leaked gas everywhere but luckily didn't actually burn down my ride. Wont be good for a finicky carb. All Holley regulators are pre-set at the factory at 2.8 PSI so there is no guesswork when first installing the regulator. Holley 12-804 fuel press regulator what pressure out of box? Use with standard pump only - not recommended for maximum pressure pumps. In fact I can completely remove the adjusting screw and it still does not go down to 3psi. I have a holley low pressure reg. For more information go to www.P65Warnings.ca.gov. I still suspect the flooding was due at least in part to fuel boiling in the carburettor bowl and venting the vapor above the float could assist. Joined: Apr 7, 2008 Posts: 1,727. By the way, I had an excellent service from this seller (5 stars!). They use gravity feed from vacuum tank mounted under the hood and directly over the exhaust manifold. Too much fuel pressure for a given needle and seat assembly can overload the needle and seat and may cause flooding or drivability problems. I ordered the 12-804 regulator online because I couldn't find one locally, this is for an engine on a piece of equipment that I make my living with. I realize this is an old post - but when people write things that are WRONG - it leaves the next Joe who comes along thinking that is the correct answer when especially in this case - it is NOT. The thinner, lighter products are at the light end of the scale the thicker heavier products are at heavy end. The 12-804 is made from durable aluminum and has a satin chrome finish that is extremely resilient to corrosion and abrasive chemicals. A long time ago it was in use in the oil business. We encountered an error while updating this page. So this thread has been a great find for me particularly at this time. You could arrange them on a scale from naptha gas, gasoline, kerosene, stove oil, diesel fuel, light lubricating oil, heavy lubricating oil, grease, asphalt. Our payment security system encrypts your information during transmission. The Holley 12-804 fuel pressure regulator features 3/8" NPT in/out ports. May God's grace bless you in the Lord Jesus Christ. . 2023 Holley Performance Products, Inc. All Rights Reserved. Shiny Finish. Too much fuel pressure for a given needle and seat . Too much anti-freeze - (typically ethylene glycol) causes the opposite effect even under pressure of the cooling system. Fuel Pressure Regulator Holley 12-804 for sale online | eBay