Copyright 2023, Antique Automobile Club of America. Check "Reid Vapor Pressure" in Wikipedia, or similar. Free Shipping - Holley Fuel Pressure Regulators with qualifying orders of $99. Call 800.979.0122, 7am-10pm, everyday. It IS variable and a result of the various fuel blend components. Quick & Hassle Free. http://www.bp.com/liveassets/bp_internet/retail/retail_australia/STAGING/local_assets/downloads_pdfs/f/FN_modern_petro_vintage_engines.pdf, Many thanks for taking the time to clarify this interesting subject . Holley 12-804 Holley Fuel Pressure Regulators JEGS 41040 JEGS Fuel Pressure Gauges Now you need fittings. (see reg-setp.pdf), This is the same design as a Holley 12-803 or 804 knock off, so I looked up Holley's instructions. Had to reset to Zero. 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. On the Holley 12-804 fuel pressure regulator, the factory preset is supposed to be 2.8 pounds - can anyone say is Holley usually pretty accurate on these presets? But the heavier elements will raise the boiling point of the mixture. The issue is boiling points UNDER PRESSURE we are talking about here - though the BP article speaks to other issues of engine and carburetor design contributing to the vapor lock problem. $59.69 . It makes no discernible difference to power but if the conditions are sufficiently adverse it will still vapour lock and then you just have to wait until it cools. 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 only difference that the Holley tech told me between the two springs is the color. 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. Then, we got what was loosely described as winter gas, all year round, with RFG. What one is after is new "liquid" fuel which vaporizes easily in open air, lights easily and has a rapid flame spread but NOT a hot explosive one, and burns easily and completely under one atmosphere of pressure - what we call 14.7 to 1 - BUT - and this is most important; does not auto-ignite at a low temperature and WAITS to be lit by the spark after being compressed in the cylinder. This Holley universal low pressurefuel regulator is factory-setto 2.7 PSI, but is fully adjustablefrom 1 to 4 PSI. Holley fuel pressure regulators are designed to precisely control the fuel pressure from the fuel pump to the carburetor. Then I got this good one, to try to get 1.5 PSI to the Kadrons. . In some areas, according to the map, RVP can vary from about 7.0 to 9.0 in some of the fuels. This regulator is used to adjust to fuel pressure requirements of various carburetors and supplies the proper pressure to the needle and seat valve to prevent flooding or drivability problems. A larger tank might need two quarts. Most certainly it will be my plan to fully explore the possibility of "treating the Fuel", with hopes that diesel fuel will make just enough difference to avoid any re-engineering. It's easy! Does it come with the hose fittings or to be bought separately? Got a gauge on the FPR to monitor, and at first it was great. Another thing you can do is wire the fuel pump to be hot in run and start through an oil pressure switch - so if the motor shuts off or looses oil pressure the fuel pump shuts off too. . Holley carburetors have powered every NASCAR(R) Sprint(R) Cup team and nearly every NHRA(R) Pro-Stock champion for four decades. 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. Show details I had a chrome dial regulator, which leaked gas everywhere but luckily didn't actually burn down my ride. Please refresh and try again. Part Number: HLY-12-803. Is it a product that would be sold by a panel beater's supply shop? In refining crude oil they distill it to separate out the different products. He finally achieved significant improvement by fitting a vent to the carburettor top (which is routed away and under the car for safety). I like the attached simple explanation of the issue. Q: Just open the hood and let things cool. I have largely eliminated this problem with all fuel system components rebuilt, and an electric fuel pump but will get occasional stumble with a hot (after say, an hour run) engine idling or in traffic if it is say, 80 or hotter out. Note also that PURE ethylene glycol is also flammable but also miscible with water. Each Holley fuel pressure regulator is fully adjustable so regulating the fuel pressure to your engines needs is a simple task. This satin finish regulator feature 3/8 pipe thread . Chemistry does NOT work that way - just like adding more any one ingredient to a cake mix will make the cake better. As the car is parked Temperature. 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. Regulator Box showed signs of being opened and clumsily closed and the advertised Rubber Gasket or Gaskets that were mentioned in the instructions were missing. Takes a little time to peel back the rubber case then remove the glass with a fine blade screwdriver, reset to zero. However I would welcome you advice on the following. WARNING! Yes. The lower I can get with this pressure is 3.5 psi (at max adjustment). For more information go to www.P65Warnings.ca.gov. Powered by Invision Community, http://www.bp.com/liveassets/bp_internet/retail/retail_australia/STAGING/local_assets/downloads_pdfs/f/FN_modern_petro_vintage_engines.pdf. For more information go to www.P65Warnings.ca.gov/passenger-vehicle, WARNING: This product can expose you to chemicals including Styrene which is known to the State of California to cause cancer. To ensure this condition, the installation of a Holley 12-810 oil pressure safety switch is recommended Usually, just runs really lean for a couple of minutes, and will not go above idle until fresh fuel finally clears through. I've had some luck using LeadMax2000 but it's not a 100% cure. Estimated Ship Date: Today. The Holley 12-804 fuel pressure regulator features 3/8" NPT in/out ports. $12.15: ac000400: Front Axle Beam Bushing Reamer For 1.34 Up To 1.50 Diameter . . A vapor lock condition would be caused. 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. As Raywith pointed out, you need to let the pressure go somewhere. What if any additives would do this and why? 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. None of these contain lead and so should not damage a catalytic converter if you have one, HOWEVER too much IMCT will prolong the burn and may result in unburnt - STILL burning HOT gas being exhausted in the exhaust cycle. For cars that require 4.5 to 9 PSI, the Holley 12-803 is the right model. 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). store It will get you close. You can do a Google search for it, though. Adding heavier weight hydrocarbons WILL raise the vapor point under pressure - usually enough to keep the fuel from vaporizing in the line or boiling off in the carburetor bowl while flowing. Click here to find a 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. bowls after each run, just to see exactly at what temperature the problems become apparent. Two 3/8" nipples/hose connections and a 3/8" to 1/8" reducer. I mix Industrial Maintenance Coating Thinner (IMCT) around 1 oz per gallon - which is basically a blend of petroleum distillate in the paint thinner / mineral spirits (once called also "white gas") family and ethyl acetate and not only does it cure vapor lock it increases octane because you can feel it in the power and acceleration. None of them worked. Holley 12-804 1-4 Psi Carbureted Two Port Fuel Pressure Regulator: Item #: HLY12-804 : Quantity: Price: $53.99 Add to cart . The point is the 0-140 regulators (they are all coming out of China now-a-days) will not regulate lower than about 20 reliably so you need a staged system - and even Holley says so on the 803BP design set up. . This item can be returned in its original condition for a full refund or replacement within 30 days of receipt. Ships from and sold by Performance Guarantee. The Holley 12-804 is a 1 to 4 range PSI regulator. Sign up for a new account in our community. That's where the pressure was going. I wanted to upload the map, but at 2.73mb, it was too big. Is there a brand name? Reasonable . Terms of Service. I put it . I have no idea - you are in uncharted territory. In theory the vapor carburetor was the way to go in that day - with lower flash point fuels like poor grade fuels that all pretty much resembled the weight of kerosene in that early day of motor fuels. Each Holley fuel pressure regulator is fully adjustable so regulating the fuel pressure to your engines needs is a simple task. The summer gasoline vaporizes in the line and the heat soak is quicker and longer on hot day's. Could you explain a little more about how you would run the bypass? I think we have hijacked Steve's thread where he asked the question about raising the boiling point of gas which hopefully has been fully answered by these side issues. If the carbs are drawing fuel and you lower the pressure at the reg, it should show on the gauge. I have found IMCT is a happy medium that does both in the right quantities - raise boiling point and octane just enough to be a "goldie-locks" kind of additive to help prevent vapor lock.
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