holley 12 804 adjustmentholley 12 804 adjustment

. Fuel pump regulator has 3/8" NPT inlet/outlet ports. . 9517377223. At first it seemed fine, set it to 1.5 PSI and away we go. To see our price, add these items to your cart. 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. Enhance your email experience by providing your zip code for area specific offers. 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. The float has a needle that projects through the top of the carburettor so it is possible to see whether the float is "floating" or not. 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. Brief content visible, double tap to read full content. Unfortunately, this fuel pressure regulator does not even come close to regulating the pressure and keeping the pressure down. Holley low pressure reg woes #12-804. None of them worked. This diaphragm repair kit is for 12-803 and 12-804 regulators. To keep it on simple terms, several people have confirmed that adding some kerosene, diesel fuel or stove oil will reduce the tendency to vapor lock and will NOT hurt an older model, low compression engine. They put everything they could into the coal oil including what we would consider low grade gasoline. The first opportunity to try it occurred recently. The Holley 12-804 is a 1 to 4 range PSI regulator. Troubleshooting Carburetor Problems and Vaporlock Blues Revisited - Hagerty Lifestyle. Right & left, Customer Reviews, including Product Star Ratings help customers to learn more about the product and decide whether it is the right product for them.Learn more how customers reviews work on Amazon. Privacy Policy. Refining of oil is basically heating it into vapors and then capturing those vapors various degrees of cooling - at the top is "propane" - at the bottom is "pitch" or "road or roof tar". Post in the forum instead. Posts: 32372. This product is intended only for the thinning of industrial maintenance coatings. It's unlikely that anything's stuck. Was actually disappointed with the quality of the regulator. 3/8 Inch NPT Ports 1 Inch 2 Out. 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. Decrease pressure by turning the adjustment screw counter-clockwise. I would like to try IMCT, how is it sold? Usually, just runs really lean for a couple of minutes, and will not go above idle until fresh fuel finally clears through. Find many great new & used options and get the best deals for Holley 26-137 Adjustable Secondary Idle Lever at the best online prices at eBay! Pre-set at 2.8 PSI 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. A: Select a store to see pricing & availability, California Transparency in Supply Chain Act. Holley HOL 12-804 12-804 Fuel Pressure Regulator. All Holley regulators are pre-set at the factory at 2.8 PSI so there is no guesswork when first installing the regulator. It is a measure, as I understand it, of how readily the fuel will evaporate in open air. There is no "chemistry set" method to measure fuel vapor points. Much of the excess engine heat will end up soaking the fuel system under the hood. The regulator that was shipped to me has an internal spring from a different model of regulator, the spring should be red. No mention of vapor lock issues, but engine de-carbon activities. 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 All kinds of remedies were tried. . Yes the light elements will still be in there. I had hoped that the cooler fuel from the electric pump would solve the problem but it did not. finish) . Stay up to date with the latest releases, events, promotions and more. 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. May God's grace bless you in the Lord Jesus Christ. Installation was made more complicated by the absence of a port for a pressure gauge, which means 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. Going to check my VW bus fuel pump pressure. 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. 4.25 out of 5 stars. => https://www.holley.com/data/Products/Technical/199R7914-3rev3.pdf. Sign up for a new account in our community. TURNING THE ADJUSTMENT SCREW ALL THE WAY IN WILL RESULT IN EXCESSIVE FUEL PRESSURE . 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. Typically there are "winter" and "summer" blends with different vapor pressures to promote atomization at cold temps and to discourage vapor lock at hot temps. 3/8 pipe thread ports; 7/32 restriction; . This item can be returned in its original condition for a full refund or replacement within 30 days of receipt. September 21, 2010 in Technical. By the way, I had an excellent service from this seller (5 stars!). the fuel pressure gage needs to be in the line going to carbs. Vapor lock was just a fact of life for the Fords. 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. In those days before 1905 kerosene had a strong piercing odor and coal oil lamps sometimes exploded. Holley 12-804 Fuel Pressure Regulator Installation Instructions . CBPN804A Swinging Drawbar Pin Kit Ford NAA 501 600 700 800 900 2000 3000 4000. Thanks to all contributors, particularly the information from Rusty, Bob and David. Shipping was fairly fast. 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 . Each Holley fuel pressure regulator is fully adjustable so regulating the fuel pressure to your engines needs is a simple task. In fact I can completely remove the adjusting screw and it still does not go down to 3psi. Q: use a 1/16 - 1/8" restrictor in the end of your fuel line to see if you can set the pressure then. Call 800.979.0122, 7am-10pm, everyday. Takes a little time to peel back the rubber case then remove the glass with a fine blade screwdriver, reset to zero. Chemistry does NOT work that way - just like adding more any one ingredient to a cake mix will make the cake better. 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. If the carbs are drawing fuel and you lower the pressure at the reg, it should show on the gauge. In the fuel use map in the Exxon or Mobil gasoline websites, there are a few places where the Reid Vapor Pressure spec is varied from other fuels. From start to finish, Holley has the parts to make your dream a reality. Is there a brand name? I recently fitted an electric fuel pump to one of the cars. 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. Eligible for Return, Refund or Replacement within 30 days of receipt. Holley carburetors have powered every NASCAR(R) Sprint(R) Cup team and nearly every NHRA(R) Pro-Stock champion for four decades. 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. They use gravity feed from vacuum tank mounted under the hood and directly over the exhaust manifold. I prefer to keep things simple but I appreciate the more correct technical approach. 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. The Holley 12-840 fuel pressure regulator features 3/8" NPT in/out ports. Take a look at the article below. I will be fitting a pressure regulator, it can only help and will have to wait for the next vapor lock to occur to see if it overcomes the flooding. THESE INSTRUCTIONS MUST BE READ AND FULLY UNDERSTOOD BEFORE BEGINNING THE . Holley 12-807 Fuel Pressure Regulator Diaphragm Repair Kit made by Holley, for as low as $9.21. 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. Of course you may already have this setup - that is the first issue. 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. . [endif]-->. I had a chrome dial regulator, which leaked gas everywhere but luckily didn't actually burn down my ride. 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. ", So . A quart of diesel added to the gas tank solves the problem without any more in side effects than a slight smell from the exhaust. See Standard conditions for temperature and pressure - Wikipedia, the free encyclopedia. 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. I do wish there were some stamped values on the adjustment screw like other models I have seen. 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. Estimated Ship Date: Today. See also Tom Ogle's "modern" vapor fueling system - google it. So with that vapor fueling system - you are stuck "downgrading it" to a lower quality fuel. Everything does just fine, until temperatures rise above 80 degrees or so, as they are soon to do. Bobburns thank you for the confirmation and technical explanation. 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. Adjustable fuel regulation from 1 to 4 psi, Holley 12-804 Reg, Fuel Press 1-4 Psi Pol. Shop Fuel Pressure Regulators at Summit Racing. It will get you close. It will meet your needs and deliver great quality at an affordable cost. Lots of Chinese Holley 12-803, 804 etc knock-offs are available. ${cardName} not available for the seller you chose. te4cmCbGnt]&~`N@RPyBTa$=~fo:/T 92YE)3Uofo4Ou].-zowDt*ae^qf9z/?. 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. Will buy again if I need another one for a different project. This will ensure that the pump will not continue to operate after the engine is . 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. Thus the "lowest boiling point are the cause of vapour lock" is also NOT CORRECT thinking. 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. The point being here - you need enough steady high enough pressure on the ball to allow it to regulate down reliably too. '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 . Adjustable Fuel Regulation From 1 To 4 PSI .220 Inch 7/32 Inch Restriction. For the best experience please upgrade or visit the site on another browser. In this document is a chart for Seasonal Gasoline Specifications. $41.19. I take this to mean that the separate boiling points of the constituents occur at atmospheric pressure but at higher pressure the resulting mix has a single boiling point. That's not to say that adding something like kersene won't help, but it can't eliminate the volatile components. Also, what is it about Kerosine, and possibly the products like LeadMx or Marvel Mystery Oil (mentioned specifically in the article) that drive some improvement? Gauge looks small..it is not. This item: Holley HOL 12-886 Regulator $13129 MEASUREMAN 1-1/2" Dial Size, 304 Stainless Steel case, Liquid Filled Fuel Pressure Gauge, 0-100Psi, 3-2-3%, 1/8"NPT Center Back Mount $2597 Moroso 65380 Fuel Line Fitting $1701 Total price: $174.27 Add all three to Cart Some of these items ship sooner than the others. . All Holley regulators are pre-set at the factory so there is no guesswork when first installing the regulator. That was in the 1990s, so you can project to more current times and suspect we have something more sophisticated now. MFG. http://www.frontieroil.com/attachments/contentmanagers/106/PrdctsSpec_UnleadGasSpecs.pdf. 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. Any thoughts on this? As Raywith pointed out, you need to let the pressure go somewhere. 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. What I would do, is with the car off, (or electric pump off), turn the screw a good ways out. If you put in too much you can return the fuel to some "kick" without knock with a small amount of acetone. 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. Add to cart. What you write in post 12 is NOT correct. In the early days of the oil business the demand was for kerosene or coal oil. . I can only say acetone will lower flash point (light easier) but also lower auto-ignition temperature and thus create knock into too much of a quantity - while a very little bit will raise octane but not lower auto-ignition - so if you go TOO low with kerosene or diesel you can bring back some kick to the fuel with SMALL amounts of acetone. We currently do not have an estimate when this item will ship. We will have the previous answer corrected. The vapor lock issues that I have are with 1920's Packards where the fuel system is essentially at atmospheric pressure throughout. FREE SHIPPING on most orders of $35+ & FREE PICKUP IN STORE. The unit however is working fine but am curious about the missing gaskets and how important they are? That work continues today through Holleys EFI products as well as through Holleys family of brands. Copyright 2023, Antique Automobile Club of America. The lower I can get with this pressure is 3.5 psi (at max adjustment). From propelling the LS-, Coyote-, and Gen 3 Hemi-swap trends, to continuously innovating late-model and vintage vehicle performance, Holleys commitment to its customers and their cars is at the core of everything we do. The reliable, albiet slower, stovebolts never suffered vapor lock because the fuel pump and lines were up front in the airstream of the engine fan. It works but not as well as some of the off brands like spectre. I appreciate it!! if you were packing them in boxes they would look identical. Too much fuel pressure for a given needle and seat . There was a problem adding this item to Cart. Lower octane will not hurt your car if the compression is low. I cannot help you - and no one can without knowing the exact make up of the gasoline being refined where you are. Reviewed in the United States on June 20, 2021. I adjust it up to 2.5 pounds and clean my hands. I Have problems with the fuel temp in my 1937 Buick. He finally achieved significant improvement by fitting a vent to the carburettor top (which is routed away and under the car for safety). Steve, gasoline isn't a single chemical compound but a mixture of hundreds of individual chemical compounds which have a large range of boiling points. Reid Vapor Pressure (RVP) is a commonly used indicator of gasoline volatility. Had to reset to Zero. Copyright 2008-2023 OReilly couple more questions, Rusty, what exactly are "heavy ends"? 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. 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. GENUINE Holley 12-804 CHROME 1-4 PSI Adjustable Fuel Pressure Regulator Kit $49.99 Free shipping Holley 12-804 Carbureted Fuel Pressure Regulator $37.07 +$14.99 shipping Holley 12-804 Chrome Street Strip Fuel Pressure Regulator 1-4 PSI $54.53 Free shipping Holley Performance 12-804 Fuel Pressure Regulator $54.53 Free shipping Holley 12-804 $55.86 1 oz per gallon - not more than 2 is usually in the right "goldie-locks" range. ). Each Holley fuel pressure regulator is fully adjustable so regulating the fuel pressure to your engines needs is a simple task. [endif]--> Many thanks for taking the time to clarify this interesting subject . . One needs to have studied Chemistry as I have to actually know how this works. Driving on a warm day in heavy stop start traffic it started vapor locking on a climb - using 10% ethanol fuel with no additive . P/N 12-803, 12-501, 12-804, 12-500, & 15812NOS Installation Instructions WARNING! 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. The BP article explains causes - not how to change fuel formulations - so for this discussion it explains nothing. I am intrigued by you statement, "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.". For over a century Holley has driven the cutting edge of fuel-system design. The peak was reached in the sixties when heavily leaded gas of over 100 octane was available. The Holley 12-804 fuel pressure regulator features 3/8" NPT in/out ports. LASTLY on your first issue of understanding vapor lock and boiling point. Enhancements you chose aren't available for this seller. Contact Us - DO NOT EMAIL CAR QUESTIONS. Check the status of your This is another vexing problem with Ethanol mix, which is about all you can get here in CT. The seller gratefully sent me a replacement part but the result was the same. Please try again. The fuel pressure is at 1 - 3 psig since the pump is not running. The fuel pump and fuel line setting top center of the engine was not only in the hottest ambient temp, except for the exhaust manifolds, under the hood they acted as a heat sink transferring heat from the block to the air. You would'nt just be reading the inlet pressure would you? This part is Backordered. Free Shipping - Holley Fuel Pressure Regulators with qualifying orders of $99. I have just this Spring started taking temp. 12-804) is a Low Pressure (1-4 PSI) regulator. I turned into a side street and opened the hood. Gasoline vaporizes according to fuel system pressure. Copyright 2023, Antique Automobile Club of America. It looks like WhatsApp is not installed on your phone. Can anyone speak to the validity of this or is anyone currently using an additive for this? Fuel pressure regulators are used to adjust for fuel pressure requirements of various carburetors. and a rotary click style one here on the shelf pete, you are welcome to borrow them to troubleshoot your problem.. let me Know. Profile Page . [endif]-->