To avoid extra back pressure on the pump, and to keep cool fuel flow past the lowest pressure point in the fuel system; a by-pass line should be used and it should NOT "dead head" to the carburetor - that is put the return line as close to the carburetor inlet as possible. This will keep your pressure steady and have instant pressure change when adjusting. In answer to Rusty's comment about adding anti freeze to water, the difference is that water is only one material, H2O, with a single boiling point (varied only by pressure). 2-Port Carbureted Fuel Pressure Regulator (12-804) by Holley. Holley 12-840 4.5-9 PSI Adjustable Billet Fuel Pressure Regulator with 3/8" NTP Ports,Black Anodized Brand: Holley 24 ratings | 11 answered questions $10902 & FREE Returns The package length is 9.652 centimeters The package height is 6.604 centimeters The package width is 9.144 centimeters Package Weight : 0.2 pounds See more product details Exclusive, high-quality Global Featured Holley Transmission Kickdown CALIFORNIA WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov. if you were packing them in boxes they would look identical. Note also that PURE ethylene glycol is also flammable but also miscible with water. Holley 12-803 Holley Fuel Pressure Regulators | Summit Racing When it burns however, it is an eye and throat irritant, even though it raises octane, burns hotter, easier, and cleaner. Features: Adjustable from 4.5-9 psi for precise fuel pressure adjustments Constructed of billet aluminum with a black anodized base and clear anodize top for good looks Used in systems where a return line is not needed Use with electric or mechanical pumps . I got all of my supplies in the Home Depot fittings section. Includes initial monthly payment and selected options. Lower octane will not hurt your car if the compression is low. . They sold more gas than coal oil. #1 Holley 12-803 Fuel Pressure Regulator January 16, 2011, 11:41 AM Can it be mounted upside down (adjustment screw pointing down) and still work properly? 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. The 12-803 4.5-9 psi spring is plain, (just the gold colored plating) the spring is accessible and replacable The cheap dial units are terrible. Holley 12-804 Fuel Pressure Regulator - amazon.ca The higher the RVP, the greater the tendency to vaporize or vapor lock. Please make sure that you are posting in the form of a question. loyalty program Might have been along the same lines as adding a quart of atf to the engine oil to help quiet noisy hydraulic valve lifters, or for "sludge clean-up" activities? It feeds fuel directly from the tank to the carburettor. 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. Holley Performance Products has been the undisputed leader in fuel systems for over 100 years. The Holley 12-804 is one of the most popular low fuel pressure regulators that works perfectly for setups that require 1 to 4 PSI. Just open the hood and let things cool. Then I got this good one, to try to get 1.5 PSI to the Kadrons. Now, Holley EFI is dominating the performance world as well as our products for GM's LS engine. It's a diaphram with a spring. http://www.jalopyjournal.com/forum/showthread.php?t=386155, Kingman, Arizona - The place on the way to other p, http://www.holley.com/types/Fuel%20Pressure%20Regulators%20-%20Carbureted.asp, (You must log in or sign up to reply here. 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. Rusty said any heavier hydrocarbon WILL raise the boiling point - and I said Rusty is correct and OD is wrong. I have adjusted a 6-9 lbs pump down. Privacy Policy. One common problem is when you have an abnormally warm day in the winter, and the low vapor pressure gasoline in the car will vapor lock on that hot day. Some Holley 12-803 4.5-9 psi and 12-804 1-4 psi regulators mislabeled from factory. Overview. Seems like the first "RFG" was closer to the old "winter" blend, which had more higher-end distillates so it'd vaporize nicely in cooler weather. If your having pressure controll issues with the Holley regulators you can eliminate most problems with stability by installing a by pass line back to the tank and usualy a street car can use 1/8 copper. No issues. However I would welcome you advice on the following. To minimize exposure, avoid breathing exhaust, do not idle the engine except as necessary, service your vehicle in a well-ventilated area and wear gloves or wash your hands frequently when servicing your vehicle. In refining crude oil they distill it to separate out the different products. A: OD says the Boiling point of gasoline cannot be raised by adding a heavier hydrocarbon - such as kerosene or diesel - and points to a high school chemistry class experiment as his proof. It takes a lot to hurt today's stainless steel valves, but in an older car be careful - and an exhaust gas temperature gauge is not a bad idea to invest in. Refineries have been doing this for decades. It is not all the same. The BP article does not address how to re-blend your own fuel, and indeed - each batch of gasoline - and even how long it has been sitting in a tank will change it's properties as certain things evaporate out of the fuel changing it's properties if in a vented tank. Posts: 32372. Holley low pressure reg woes #12-804 | The H.A.M.B. Steve_Mack_CT 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. Great feedback from a knowledgeable group, guys! . Profile Page . Starting in 1970 leaded gas was taken off the market resulting in the gas we have today. Contact Us - DO NOT EMAIL CAR QUESTIONS. Holley 804 fuel pressure regulator install - YouTube 0:00 / 5:58 Holley 804 fuel pressure regulator install Schnebs Garage 2.42K subscribers Join Subscribe 72 Share Save 15K views 3 years ago. 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.Regulator has a 3/8" NPT . neglect, accident, improper installation or adjustment, dirt or other contaminants, water, corrosion or faulty repair, or used in applications other than . The seller gratefully sent me a replacement part but the result was the same. It works but not as well as some of the off brands like spectre. Easy to read. te4cmCbGnt]&~`N@RPyBTa$=~fo:/T 92YE)3Uofo4Ou].-zowDt*ae^qf9z/?. Troubleshooting Carburetor Problems and Vaporlock Blues Revisited - Hagerty Lifestyle. Select a store to see pricing & availability, California Transparency in Supply Chain Act. Each Holley fuel pressure regulator is fully adjustable so regulating the fuel pressure to your engines needs is a simple task. So if you're looking for a FPR to get 1-4 psi, then the 12-804 is no longer your best choice. I wanted to upload the map, but at 2.73mb, it was too big. ESPECIALLY a 10% ethanol blend - once generically called the gasohol summer blend in that vapor system would really be a problem. How much should I add to every gallon of gas.I believe they are adding about 5% ethanol to the fuel here. So in an open cup the boiling points would also appear the same as water but under pressure the boiling point is different. [endif]--> Many thanks for taking the time to clarify this interesting subject . If yes what size should I, A: . Show details Hydrogen Power Central | The true source for powering engines with Hydrogen - not "HHO", Standard conditions for temperature and pressure - Wikipedia, the free encyclopedia, https://www.holley.com/data/Products/Technical/199R7914-3rev3.pdf. Please use a different way to share. Holley 12-807 Fuel Pressure Regulator Diaphragm Repair Kit This will ensure that the pump will not continue to operate after the engine is . I turned into a side street and opened the hood. . One needs to have studied Chemistry as I have to actually know how this works. ${cardName} unavailable for quantities greater than ${maxQuantity}. Error posting question. I have no idea - you are in uncharted territory. That was in the 1990s, so you can project to more current times and suspect we have something more sophisticated now. Decrease pressure by turning the adjustment screw counter-clockwise. Driving on a warm day in heavy stop start traffic it started vapor locking on a climb - using 10% ethanol fuel with no additive . Can you adjust the fuel pressure? 1996-2023, Amazon.com, Inc. or its affiliates, Select a location to see product availability, Holley HOL 12-804 12-804 Fuel Pressure Regulator. Ships from and sold by Performance Guarantee. Rusty, thanks so much for this information. Two 3/8" nipples/hose connections and a 3/8" to 1/8" reducer. 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 can start my car instantly after sitting in a cool garage at about 75 deg F. Drive 30 miles and then park for 20 minutes. Then, we got what was loosely described as winter gas, all year round, with RFG. Holley 12-840 HP Billet Carbureted Fuel Pressure Regulator Quick & Hassle Free. 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Boy am I glad to have happened on this thread. Among other places on the web - you will find a fairly good dissertation of the issue at => Evergreen Performance Systems, Inc. and Hydrogen Power Central | The true source for powering engines with Hydrogen - not "HHO". Reviewed in the United States on June 5, 2022. One is a deadhead and one is a by-pass. Holley part number for the kit is 12-807; Summit sells it for about $6. I appreciate it. US $57.76 Finish:Gold Zinc billet aluminum bracket that conveniently mounts a 12-803 Black anodized 12-804 or 12-803BP fuel pressure regulator utilizing the passenger side carb studs on any 4150 / 4160 style carburetor. The check ball is held shut with the diaphragm and spring and once the desired fuel pressure builds up it opens that valve and allows fuel to go back to the tank. Also I fitted a modern soft seat to the carburettor to assist in shutting off the higher pressure from the pump - the original shut off is a brass tapered needle on a brass seat. . . Holley 12-804 Holley Fuel Pressure Regulators | Summit Racing Full content visible, double tap to read brief content. At first it seemed fine, set it to 1.5 PSI and away we go. Lots of Chinese Holley 12-803, 804 etc knock-offs are available. The only difference that the Holley tech told me between the two springs is the color. Copyright 2008-2023 OReilly Post in the forum instead. Conversely if you go too high and it knocks - you can bring it down with kerosene or the paint thinner family. Yes, you will need to buy the type of connection you want to use such as hose barb, compre. Holley fuel pressure regulators are designed to precisely control the fuel pressure from the fuel pump to the carburetor. Vapor lock was just a fact of life for the Fords. So - you cannot just say whether it will work or not. Depending what your compression is you could add 5% kerosene up to 25% for cars from the 20s with very low compression, like 5:1 or less. 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. Join Date: Nov 2007 Posts: 22035 Share Tweet #2 Like many others, I have been considering what to do recently. . If this is true, how come adding antifreeze to water raises the boiling point? [endif]-->,