Unfortunately, these FPR are now made in Korea and they no longer include an alternate spring. Copyright 2023, Antique Automobile Club of America. 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 Use with standard pump only - not recommended for maximum pressure pumps. For any further assistance please feel free to call us at: 1-877-238-2623 or visit the nearest Advance Auto store and one of our representatives will gladly assist you with any questions or concerns you may have. In fractional distillation (the refining of oil) - what we call "mineral spirits", "paint thinner", "kerosene" and "diesel fuel" all ALL "heavier" hydrocarbons (pretty much in that order) than what we call gasoline - in that they occur lower in the distillation tower and condense at lower temperatures back into liquid before what we call "gasoline" does. There is supposed to a marking on the spring with the correct color, red or gold if it is the low pressure spring. Is there a brand name? Too much fuel pressure for a given needle and seat assembly can overload the needle and seat and may cause flooding or drivability problems. Once these chemicals are blended - the over-all resulting chemical properties - especially boiling point under pressure is changed - they are NO LONGER SEPARATE boiling points in play. Vapor lock is caused by usually a fuel that vaporizes too easily at too low a pressure (in the line) due to under-hood heat and not enough pressure on it - which would run great if it could make it to the combustion chamber first. All Holley regulators are pre-set at the factory so there is no guesswork when first installing the regulator. Shopping Cart 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. Thanks for the comments, I am aware of the need for a regulating valve to reduce the pump pressure and would have fitted one except that I was advised by the owner of an identical car to mine that his car does not flood using the same electric pump without a regulator, it is only a 2.5 -4 psi pump. Quick & Hassle Free. $12.15: ac000400: Front Axle Beam Bushing Reamer For 1.34 Up To 1.50 Diameter . I will be trying one of these but am curious what is the active ingredient(s). I did, works great & looks beautiful. As a single solution, or partnered with products from other Holley companies - Hooker Headers(R), Flowtech(R) Exhaust, NOS(R) Nitrous, Weiand(R), Earl's Performance Plumbing(R), or Diablosport(R)- Holley products can give you the edge you need over the competition. 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. So this thread has been a great find for me particularly at this time. 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. As an example water would boil and thus "vapor lock" at a really low temperature without ethylene glycol. Brief content visible, double tap to read full content. How much should I add to every gallon of gas.I believe they are adding about 5% ethanol to the fuel here. Show details Post in the forum instead. . I adjust it up to 2.5 pounds and clean my hands. on this design the adjusting screw all the way out should decrease the pressure the most - IF the ball valve will seat TIGHT, When I adjusted pressure below 30 - it would not seat any longer even with the adjustment screw all the way out. Fuel pressure regulators are used to adjust for fuel pressure requirements of various carburetors. ***The inlet pressure limitation is 7 psi. I installed this on my Onan 7000 generator as part of a project to resolve vapor lock issues in hot weather and high altitudes. Reviewed in the United States on April 2, 2022. But the heavier elements will raise the boiling point of the mixture. 3/8Inch Npt Ports 1 Inch 2 Out. The carburettor was flooding, the electric pump was still running. The regulator that was shipped to me has an internal spring from a different model of regulator, the spring should be red. It's a diaphram with a spring. Log In / Register Order Status. Octane is an actual chemical which would be at the light end of the scale for gas, kerosene would be at the heavy end. Why does this occur only under increased pressure? The other part numbers utilize an AN O-ring inlet, outlet, & return ports, and do not require any sealer on the threads. 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). (that is this one in the image below) The adjustment spring under the adjustment screw is pushing down on the diaphragm holding the ball off it's . Q: Boiling is a violent version of vaporizing. Holley Performance Products has been the undisputed leader in fuel systems for over 100 years. By the way, I had an excellent service from this seller (5 stars!). WARNING! The peak was reached in the sixties when heavily leaded gas of over 100 octane was available. With this set up, pressures throughout system varies only very slightly from atmospheric, lower up to the vacuum tank and higher in the gravity feed from the vacuum tank to the carburettor. I prefer to keep things simple but I appreciate the more correct technical approach. I have just this Spring started taking temp. Works and does the job. I look upon that effort with a heavy heart though, for I have been religious about keeping the old car original as possible. (Maybe this arrangement was intentional to assist in vaporising the fuels of the day but it is all bad in hot weather with today's fuels). Holley fuel pressure regulators are designed to precisely control the fuel pressure from the fuel pump to the carburetor. 1996-2023, Amazon.com, Inc. or its affiliates, Select a location to see product availability, Holley HOL 12-804 12-804 Fuel Pressure Regulator. the cause for your fuel pressure fluxuation is because the fuel pressure is bumping up against the regulator and the extra fuel has no where to go , the quick fix is run a return line . Holley 12-803 Two Port Chrome Fuel Pressure Regulator - 1-4 PSI. I Have problems with the fuel temp in my 1937 Buick. . Estimated Ship Date: Today. 2-Port Carbureted Fuel Pressure Regulator (12-804) by Holley. I turned into a side street and opened the hood. This Holley universal low pressure fuel regulator is factory-set to 2.7 PSI, but is fully adjustable from 1 to 4 PSI. . Regards, Mike. 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. For the best experience please upgrade or visit the site on another browser. The Holley 12-804 fuel pressure regulator features 3/8" NPT in/out ports. 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. I have used up to 20% kerosene with no discernible change and have spoken to people who told me that years ago on farms these old cars would run fine if started on gasoline then switched to 100% kerosene. As the car is parked Temperature. Just open the hood and let things cool. Each Holley fuel pressure regulator is fully adjustable so regulating the fuel pressure to your engines needs is a simple task. Adjustable Fuel Regulation From 1 To 4 PSI .220 Inch 7/32 Inch Restriction. Please make sure that you are posting in the form of a question. At first it seemed fine, set it to 1.5 PSI and away we go. The only difference that the Holley tech told me between the two springs is the color. Will rise to above 180 degrees on the Temperature gauge. Find an Automotive Service Professional and a rotary click style one here on the shelf pete, you are welcome to borrow them to troubleshoot your problem.. let me Know. Contact Us - DO NOT EMAIL CAR QUESTIONS. See also Tom Ogle's "modern" vapor fueling system - google it. You need to be a member in order to leave a comment. Reviewed in the United States on September 4, 2017. It's not the vendor's fault, these things should have been recalled, or the vendors made aware of the issue so that they could be inspected before they're sold. Plain WATER has great cooling properties, but under pressure will boil at a lower temperature than anti-freeze mixed with water - up to a certain point. bowls after each run, just to see exactly at what temperature the problems become apparent. The Holley 12-804 is a 1 to 4 range PSI regulator. Bobburns thank you for the confirmation and technical explanation. If so how? [endif]-->