Interesting theory. Vapor lock was just a fact of life for the Fords. Now, Holley EFI is dominating the performance world as well as our products for GM's LS engine. I switched on the electric pump and it instantly picked up and ran for a few seconds then reverted to the classic vapor lock symptoms. 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. A: I have a holley low pressure reg. This item can be returned in its original condition for a full refund or replacement within 30 days of receipt. I have adjusted a 6-9 lbs pump down. If so how? The Holley 12-840 fuel pressure regulator features 3/8" NPT in/out ports. May God's grace bless you in the Lord Jesus Christ. The peak was reached in the sixties when heavily leaded gas of over 100 octane was available. That work continues today through Holleys EFI products as well as through Holleys family of brands. . Today's fuel is made for high compression engines - and it has an intentionally lower vapor point, with a higher flash point and autoignition point. There is no "chemistry set" method to measure fuel vapor points. Decrease pressure by turning the adjustment screw counter-clockwise. 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. I had a chrome dial regulator, which leaked gas everywhere but luckily didn't actually burn down my ride. No issues. But the heavier elements will raise the boiling point of the mixture. Volatility is a measure of the gasolines tendency to vaporize under a given set of conditions. Adjustable fuel regulation from 1 to 4 psi, 1965 and older U.S. manufactured California Certified vehicles, 1967 and older U.S. manufactured Federally Certified vehicles, 1967 and older Foreign manufactured vehicle, 1966 and newer U.S. manufactured California Certified vehicles, 1968 and newer U.S. manufactured Federally Certified vehicles, 1968 and newer Foreign manufactured vehicle. Holley Manufacturer Part Number 12-804 Manufacturer Holley Assembled Product Dimensions (L x W x H) 3.50 x 3.50 x 2.50 Inches Warranty Warranty information 90 DAY REPLACEMENT IF DEFECTIVE Warnings Warning Text proposition 65 reasons:titanium dioxide, other chemicals WARNING - California Proposition 65 None Report incorrect product information I've had some luck using LeadMax2000 but it's not a 100% cure. Enhancements you chose aren't available for this seller. It is not all the same. The only difference that the Holley tech told me between the two springs is the color. I do wish there were some stamped values on the adjustment screw like other models I have seen. Free Shipping - Holley Fuel Pressure Regulators with qualifying orders of $99. YES the boiling point of gasoline can be raised (or lowered) by an additive - depending on what it is - as can the autoignition temperature which will increase "knock" - using the right additive for the fuel you just bought and put in your tank is the trick and it is always going to be hit and miss - depending on what refinery produced the gasoline in the first place. Steve_Mack_CT 2023 Holley Performance Products, Inc. All Rights Reserved. [endif]-->. [{"displayPrice":"$58.17","priceAmount":58.17,"currencySymbol":"$","integerValue":"58","decimalSeparator":".","fractionalValue":"17","symbolPosition":"left","hasSpace":false,"showFractionalPartIfEmpty":true,"offerListingId":"UhTnfcw7IZxaNntXlJwDKCZdMn2swwW9Qa8PxzrWBz%2By8RC0ilxVsHIj8toGUO%2FPmmF8b2HD1iNYooZ7n4ER0XuKiQsQQvJG86lgqsni6KYZs%2FdLcIOIE0Ukulbz%2BJYBuUOC820ciUZxU2UEL9sUjtoq8gdk8bOPIZ3QChg8zpgyIZxlTaXQEA%3D%3D","locale":"en-US","buyingOptionType":"NEW"}]. He finally achieved significant improvement by fitting a vent to the carburettor top (which is routed away and under the car for safety). A: We are sorry. Holley part number for the kit is 12-807; Summit sells it for about $6. Too much fuel pressure for a given needle and seat . On occasions here in NZ, we get extreme heat and old cars vaporlock. So, I take the reg apart to see if it is all clean and looks good. A vapor lock condition would be caused. 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. 12-804) is a Low Pressure (1-4 PSI) regulator. Please try again later. From that time on octane ratings slowly rose, helped by the addition of more and more tetraethyl lead. The vapor lock issues that I have are with 1920's Packards where the fuel system is essentially at atmospheric pressure throughout. Unfortunately, these FPR are now made in Korea and they no longer include an alternate spring. The Holley 12-804 fuel pressure regulator features 3/8" NPT in/out ports. '92 Ford Mustang GT: 385"/6.3L SBF, Dart SHP 8.2 block, forged steel crankshaft & H-beam rods, forged pistons, Trick Flow Twisted Wedge . Please use a different way to share. It is an experimental thing and MORE IS NOT BETTER - less is better until you find the happy medium based the fuel you buy or have in the tank already. This approach is not recommended for higher compression cars made from the mid fifties onwards. That is why fuel injection systems push usually 45 to 60 psi on the fuel at all times with a by-pass line - to keep it liquid and keep it moving - so it cannot turn to vapor in the lines. You would'nt just be reading the inlet pressure would you? 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. Once the fuel fills up the float bowls in the carburetor and the needles and seats shut, it starts to build pressure, pushing the diaphragm against the adjustment spring under the adjustment screw and allowing the ball to go "up" against the seat, effectively shutting off fuel flow to the carb. Too much anti-freeze - (typically ethylene glycol) causes the opposite effect even under pressure of the cooling system. 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 long time ago it was in use in the oil business. Each Holley fuel pressure regulator is fully adjustable so regulating the fuel pressure to your engines needs is a simple task. Reviewed in the United States on June 5, 2022. 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. "Pure" Ethyl Acetate could be called an "alcohol" as Ethyl acetate is the ester of ethanol and acetic acid; and it is manufactured on a large scale for use as a solvent. I have used kerosene to avoid vapor lock and there is no doubt it helps, the more the better up to 20% in a low compression 1920's car. Adding some additives can raise the AVERGE boiling point but cannot remove the lower-boiling components, so regardless of what higher ends are present, the initial boiling point will remain that of the most volatile components. #2. 3 0 obj <>stream We will have the previous answer corrected. It was about this time that car makers lowered the compression ratios, went to long stroke motors, and developed hot spots and vaporizers on their intakes to burn the new low grade or low octane gas. All Holley regulators are pre-set at the factory so there is no guesswork when first installing the regulator. For more information go to www.P65Warnings.ca.gov. Free shipping for many products! . There was a problem adding this item to Cart. 03-28-2012, 03:04 AM. Applications. September 21, 2010 in Technical. Second, you adjust this regulator by turning the hex screw on top - does anyone happen to know how many pounds one or more full turns would produce etc? Starting in 1970 leaded gas was taken off the market resulting in the gas we have today. There is clearance around the needle which I would have thought would be enough to vent the increased pressure but maybe not. 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. I would welcome your advice on this - with apologies for the length of this post. Reviewed in the United Kingdom on January 31, 2016, Reviewed in Canada on January 27, 2023, Reviewed in Canada on December 18, 2019, Reviewed in Canada on November 10, 2020, Automotive Performance Fuel Injection Systems, Automotive Replacement Fuel Injection Pressure Regulators, Learn more how customers reviews work on Amazon, Holley 12-804 Reg, Fuel Press 1-4 Psi Pol. Its a bypass arrangement with non return valves to prevent reverse flow and is operated by a switch for use in event of vapor lock. In the early days of the oil business the demand was for kerosene or coal oil. So if you're looking for a FPR to get 1-4 psi, then the 12-804 is no longer your best choice. I have just this Spring started taking temp. That was in the 1990s, so you can project to more current times and suspect we have something more sophisticated now. Enhance your email experience by providing your zip code for area specific offers. A: Generally speaking if your car was made before 1953 it has low compression. You set it to the exact fuel pressure you want. #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? Octane is an actual chemical which would be at the light end of the scale for gas, kerosene would be at the heavy end. Call 800.979.0122, 7am-10pm, everyday. There are two kinds and they look the same. How much should I add to every gallon of gas.I believe they are adding about 5% ethanol to the fuel here. f9vxY"IpBQ? Did not like having to reset to zerobut I did. Today's cars are all fuel injection so it doesn't matter how easily the gas evaporates, it is under pressure in a closed system from the tank to the intake. Works and does the job. Prewar cars have very low compression and will run better on gas that has some kerosene added. Too much fuel pressure for a given needle and seat assembly can overload the needle and seat and may cause flooding or drivability problems. To ensure this condition, the installation of a Holley 12-810 oil pressure safety switch is recommended 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. 12-804 12-500 Low-Pressure Fuel Regulator (std. Add to cart. 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. Bobburns thank you for the confirmation and technical explanation. Exclusive, high-quality Global Featured Holley Transmission Kickdown Cable Bracket 20-121; Gold Zinc Steel for 700R4 . You need to be a member in order to leave a comment. From start to finish, Holley has the parts to make your dream a reality. Neither the Holley instructions nor anywhere I can find says what the maximum inlet PSI should be allowed to the regulator - but I was told it was 16 psi and one other spot on the web says something similar. THE SECOND ISSUE - the vapor system on the Packard is going to be a problem no matter what today. Is it a product that would be sold by a panel beater's supply shop? LASTLY on your first issue of understanding vapor lock and boiling point. . The point being here - you need enough steady high enough pressure on the ball to allow it to regulate down reliably too. Some cars are much more apparent to vapor locking than others, I"ve never experienced here in NJ with either of my older Packards which see all kind of hot summer driving conditions. HWYoF~Ta77[Z4"bG K=yK here's one installed,same holley low pressure regulator, line pressure in the top, one side is hooked to the fuel pressure sender, other to the line going to the fuel block. But, . Cool. Purchased the regulator from Baxter, unit arrived in 4 days.. Was actually disappointed with the quality of the regulator. Adjusting Holley & Demon Mixture Screws; Holley Specs HP Series; Edelbrock Carburetor Specs; Holley Double Pumper 4150 Specs; Carter Competition Series AFB Specs; Company Info. For cars that require 4.5 to 9 PSI, the Holley 12-803 is the right model. MFG. Takes a little time to peel back the rubber case then remove the glass with a fine blade screwdriver, reset to zero. If I could get 75-85 octane, non-ethanol, Regular gasoline that vaporized at above 180 deg F, I think my car would run fine all the time. Never had it act up while running, but since E10 fuel came along it is borderline getting started after hot shutdowns. The Holley 12-804 fuel pressure regulator features 3/8" NPT in/out ports. If the carbs are drawing fuel and you lower the pressure at the reg, it should show on the gauge. 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. fuel pressure in at the top, fuel pressure out on each side. 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. The lower I can get with this pressure is 3.5 psi (at max adjustment). A by-pass style regulator has the fuel coming in the same side of the check ball as where the fuel comes out to the carb. As an example water would boil and thus "vapor lock" at a really low temperature without ethylene glycol. Holley HOL 12-804 12-804 Fuel Pressure Regulator Brand: Holley 436 ratings | 33 answered questions Amazon's Choice in Automotive Replacement Fuel Injection Pressure Regulators by Holley $4119 FREE Returns Adjustable fuel regulation from 1 to 4 psi .220" (7/32") restriction 3/8" NPT ports ( 1 in, 2 out) Mounting bracket included Pre-set at 2.8 PSI It needed a bit of adjusting for my purpose, but other than that, it performed perfectly. Shipping was fairly fast. To add the following enhancements to your purchase, choose a different seller. Use with standard pump only - not recommended for maximum pressure pumps. Holley 12-804 Fuel Pressure Regulator 3/8 pipe thread ports 7/32 restriction Pressure ranges from 1 to 4 PSI Includes mounting bracket Satin finish 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. It looks like WhatsApp is not installed on your phone. . Full content visible, double tap to read brief content. When I got it to down to 30 - then the 0-15 psi reg would not hold anymore and climbed to 15 flooding out the engine. I turned into a side street and opened the hood. Wouldn't the water still evaporate at the same temp? You can do a Google search for it, though. 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. Lots of Chinese Holley 12-803, 804 etc knock-offs are available. 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". Shopping Cart You refer to the problem of the additive increasing the propensity for the fuel to self ignite however in my case the compression ratio of the cars is so low (around 4 : 1) that I doubt that it would be a problem. IMCT is found in the paint isle of any hardware or home improvement store usually in quart or gallon cans. Holley Fuel Pressure Regulators 12-803 HLY-12-803. 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. . 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. Holley 12-804 low pressure regulator, Weber, jeep etc. If you have it plumbed up "dead headed", lowering the pressure might not react very quickly. All Holley regulators are pre-set at the factory at 2.8 PSI so there is no guesswork when first installing the regulator. When it burns however, it is an eye and throat irritant, even though it raises octane, burns hotter, easier, and cleaner. It seemed to work fine for a while after I dialed it into 2psi at idle, but now it reads 6psi and it won't adjust down to 3psi. Discussion in 'The Hokey Ass Message Board' started by oldrelics, Oct 12, 2010. Works, don't use a liquid filled gauge in an engine compartment! By 1913 it was the other way around. Check the status of your Recommended Parts. One is a deadhead and one is a by-pass. Rusty, if you can find a cooperative local high school chemistry class, take a small amount of gasoline, split it into 2 portions, add 5% or so kerosene to one half, and have them do a fractional distillation on both. Also in Tools, Shop Equipment & Chemicals, Cataclean - Fuel and Exhaust System Cleaner, Cataclean Diesel - Fuel and Exhaust System Cleaner, Distribution Blocks, Filters, Adapters and Fittings, Microswitch and Solenoid Mounting Brackets, Mr. Gasket Fuel Pressure Gauge - 0-15 PSI - 1-1/2 Inch Diameter, Mr. Gasket Fuel Block with 0-15 PSI Liquid Filled Fuel Pressure Gauge, 25 GPH Holley Mighty Mite Electric Fuel Pump, 1.5-4 PSI, Earl's Fem.1/8" NPT to Male 3/8" NPT Pipe Bushing Reducer. Gauge looks small..it is not. Boiling is a violent version of vaporizing. . Open the unit and check the spring color, Reviewed in the United States on April 9, 2018. Lower octane will not hurt your car if the compression is low. TURNING THE ADJUSTMENT SCREW ALL THE WAY IN WILL RESULT IN EXCESSIVE FUEL PRESSURE . 100% Satisfaction Guaranteed CBPN804A Swinging Drawbar Pin Kit Ford NAA 501 600 700 800 900 2000 3000 4000 satisfaction guarantee the daily low price westernnorthndc.org, US $11.9 3000 501 Also services earlier models (1953 to 1964) using swinging drawbar: NAA 600 For Ford Tractors 2000 4000 (1965 and up) Jubilee . The '54 Bentley already has an electric SU pump back near the tank, and it's low pressure output is just about right for the two SU H6 type carbs. The regulator that was shipped to me has an internal spring from a different model of regulator, the spring should be red. Turn the screw out to lower the pressure. The Holley 12-804 is a 1 to 4 range PSI regulator. . Adjustable Fuel Regulation From 1 To 4 PSI.220 Inch 7/32 Inch Restriction. Changing the vapor pressure (and thus the boiling point) of gasoline is not new. 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 . [endif]-->