holley 12 804 adjustment

I turned into a side street and opened the hood. But the heavier elements will raise the boiling point of the mixture. 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. There is no "chemistry set" method to measure fuel vapor points. Loosening the regulator locknut and turning the adjustment screw clockwise increases the pressure. Wont be good for a finicky carb. PDF Holley Billet Fuel Pressure Regulators P/N 12-841, 12-842, 12-845, 12 . 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. See Standard conditions for temperature and pressure - Wikipedia, the free encyclopedia. Recommended Parts. I have the one I have set up in a deadhead setup. Try it, I think you will find it works. Features: Adjustable fuel regulation from 1 to 4 psi .220" (7/32") restriction 3/8" NPT ports ( 1 in, 2 out) Chrome finish Mounting bracket included Pre-set at 2.8 PSI About Holley Use with standard pump only - not recommended for maximum pressure pumps. readings of the carb. 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 . I recently fitted an electric fuel pump to one of the cars. 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. Yes you can adjust fuel pressure with this regulator. Holley HOL 12-804 12-804 Fuel Pressure Regulator. 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. . 3/8 Inch NPT Ports 1 Inch 2 Out. At first it seemed fine, set it to 1.5 PSI and away we go. $59.69 . Tags: None TheSilverBuick ALMOST Spidey ! should be one inlet in two outlets out, i've seen very smart mechanically inclined people hook the carb to one outlet and the pressure in to the other, it's easy to do, not saying anything bad but could be a a possibility. Some parts are not legal for use in California or other states with similar regulations. Fuel pump regulator has 3/8" NPT inlet/outlet ports. I commented that it was already vented by the clearance around where the float needle projects through the top but he advised that this was not enough and the vent needed to be at least a 1/4" tube and that he could see it venting vapor. PDF Holley 12-804 Fuel Pressure Regulator Installation Instructions - JEGS The other part numbers utilize an AN O-ring inlet, outlet, & return ports, and do not require any sealer on the threads. Sign up for a new account in our community. #2. Holley Carburetor Fuel Pressure Regulator 1 To 4 Psi Bottom Inlet Sides Rich boys replaced their 216 stovebolt 6's with GMC 270 or 302 sixes with a performance "full race" cam. Holley HOL 12-886 Regulator, Pressure Regulators - Amazon Canada Generally speaking if your car was made before 1953 it has low compression. LOW PRESSURE REGULATOR 12-804 - Allstate Carburetor Adjustable Fuel Regulation From 1 To 4 PSI.220 Inch 7/32 Inch Restriction. 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. 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. May God's grace bless you in the Lord Jesus Christ. Much of the excess engine heat will end up soaking the fuel system under the hood. near you You'll find they both have the same initial boiling point - been there and done it. It IS variable and a result of the various fuel blend components. 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. 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. Holley 12-804 Holley Fuel Pressure Regulators JEGS 41040 JEGS Fuel Pressure Gauges Now you need fittings. Fuel Pressure Regulator Holley 12-804 for sale online | eBay 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. This item can be returned in its original condition for a full refund or replacement within 30 days of receipt. Q: 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. Unfortunately, these FPR are now made in Korea and they no longer include an alternate spring. ${cardName} not available for the seller you chose. Now, Holley EFI is dominating the performance world as well as our products for GM's LS engine. Worked well out of the box. 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. Holley 12-803 Holley Fuel Pressure Regulators | Summit Racing I had a chrome dial regulator, which leaked gas everywhere but luckily didn't actually burn down my ride. Fuel Pressure Regulator - Walmart.com Auto Parts v 6c02f45cd (2fvgn) cv1440. One must understand the chemical reactions and interactions of blending other hydrocarbons into what we call gasoline and then still have it able to have the same properties desired of the product called gasoline. Did not like having to reset to zerobut I did. Log In / Register Order Status. It appears this one needs 40 to 50 minimum. I still suspect the flooding was due at least in part to fuel boiling in the carburettor bowl and venting the vapor above the float could assist. Unfortunately, this fuel pressure regulator does not even come close to regulating the pressure and keeping the pressure down. The regulator that was shipped to me has an internal spring from a different model of regulator, the spring should be red. A: Check "Reid Vapor Pressure" in Wikipedia, or similar. Please refresh and try again. Holley 12 803 instructions - United States manuals Step-by-step Tutorials 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. If yes what size should I, A: I have heard true lead (LeadMax2000 or simillar) may do this as well? 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. We work hard to protect your security and privacy. Holley 12-840 4.5-9 PSI Adjustable Billet Fuel Pressure Regulator with 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. 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? Brief content visible, double tap to read full content. Each Holley fuel pressure regulator is fully adjustable so regulating the fuel pressure to your engines needs is a simple task. Holley part number for the kit is 12-807; Summit sells it for about $6. The intent being to get "cool" fuel to the carburettor bypassing the areas where the system heats the fuel. The issue is simple that one is seeking to "re-blend" their own gasoline from one already sold. Troubleshooting Carburetor Problems and Vaporlock Blues Revisited - Hagerty Lifestyle. %PDF-1.4 The engine was running. I look upon that effort with a heavy heart though, for I have been religious about keeping the old car original as possible. LASTLY on your first issue of understanding vapor lock and boiling point. Holley Fuel Pressure Regulator 12-804 - Advance Auto Parts There's always a catch with bargains, Reviewed in the United States on July 9, 2022. Too much fuel pressure for a given needle and seat assembly can overload the needle and seat and may cause flooding or drivability problems. The following vehicles are considered Uncontrolled (Non-Emissions Controlled) Vehicles: WARNING: It is against the law to install this part on an Emissions Controlled Vehicle. CALIFORNIA WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov. Find an Automotive Service Professional . 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. Please try again. Adjustable fuel regulation from 1 to 4 psi, Holley 12-804 Reg, Fuel Press 1-4 Psi Pol. No mention of vapor lock issues, but engine de-carbon activities. The Holley 12-804 is a 1 to 4 range PSI regulator. One is a deadhead and one is a by-pass. Holley 12-840 HP Billet Carbureted Fuel Pressure Regulator Thus the "lowest boiling point are the cause of vapour lock" is also NOT CORRECT thinking. All petroleum distillates have different chemical properties which change depending on what you mix them with. If you put in too much you can return the fuel to some "kick" without knock with a small amount of acetone. I would welcome your advice on this - with apologies for the length of this post. Privacy Policy. In a deadhead design the fuel comes into the regulator from the bottom past a check ball which is held open by a pin on the diaphragm. Reid Vapor Pressure (RVP) is a commonly used indicator of gasoline volatility. Gasoline vaporizes according to fuel system pressure. 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. 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. [endif]--> Many thanks for taking the time to clarify this interesting subject . The peak was reached in the sixties when heavily leaded gas of over 100 octane was available. All Holley regulators are pre-set at the factory at 2.8 PSI so there is no guesswork when first installing the regulator. For now, in 70 degrees ambient, the bowls are 100 F. at shut-down and after 15 minutes they rise to 115 F. At these temperatures the engine starts back up fine, but I believe another ten degrees will be in the problem zone. Gauge looks small..it is not. wrapped around the fuel lines. I like the attached simple explanation of the issue. Holley carburetors have powered every NASCAR(R) Sprint(R) Cup team and nearly every NHRA(R) Pro-Stock champion for four decades. None of them worked. You can do a Google search for it, though. => https://www.holley.com/data/Products/Technical/199R7914-3rev3.pdf. 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. Reviewed in the United States on June 5, 2022. 4.25 out of 5 stars. He asked about issues and thoughts of what causes vapor lock, so it is just answered in more detail and suggested solutions on how to fix vapor lock. Chrome Finish. This Holley universal low pressurefuel regulator is factory-setto 2.7 PSI, but is fully adjustablefrom 1 to 4 PSI. order I realize this is an old post - but when people write things that are WRONG - it leaves the next Joe who comes along thinking that is the correct answer when especially in this case - it is NOT. But, . 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. It feeds fuel directly from the tank to the carburettor. 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? 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 Note also that PURE ethylene glycol is also flammable but also miscible with water. Learn more about our Some Holley 12-803 4.5-9 psi and 12-804 1-4 psi regulators mislabeled from factory. BP cannot by law tell you what you can blend into fuel to change its properties - but any petroleum distillate can be used - and the ester family - many of the alcohols we call them - can also be used. f9vxY"IpBQ? Mr. Gasket 1561 Fuel Pressure Gauge 1.500 in. Pre-set at 2.8 PSI 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. 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. This part is legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles. Fuel Pressure Regulators Instruction Sheet (42712804), Designed to be used with standard pump only, Measures 2-1/2" wide and 1-1/2" tall and deep, This low pressure fuel regulator is factory-set to 2.7 PSI, but is fully adjustable from 1 to 4 PSI, It includes mounting bracket with 2 each self-tapping screws for regulator to bracket installation purposes and 3 screws for bracket to vehicle installation, 1-3/4" hole spacing to mount the regulator to the bracket. I have a electric pump at the tank to try and speed up the fuel cooling process but if you have a 100 deg F day you may have fuel near 100 deg F in the tank. There is supposed to a marking on the spring with the correct color, red or gold if it is the low pressure spring. . 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 When it burns however, it is an eye and throat irritant, even though it raises octane, burns hotter, easier, and cleaner. It works but not as well as some of the off brands like spectre. We are sorry. 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 got all of my supplies in the Home Depot fittings section. 03-28-2012, 03:04 AM. These cars have the carburettor mounted in "V" of the engine with exhaust manifolds running along each side of the carburettor which combined with under hood engine heat makes these cars very susceptible to vapor lock. The seller gratefully sent me a replacement part but the result was the same. . Two 3/8" nipples/hose connections and a 3/8" to 1/8" reducer. FREE SHIPPING on most orders of $35+ & FREE PICKUP IN STORE. 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. Turn the screw out to lower the pressure. . Too much anti-freeze - (typically ethylene glycol) causes the opposite effect even under pressure of the cooling system. Holley 12-804 Fuel Pressure Regulator Brand: Holley 415 ratings -11% $6614 Was: $73.94 3/8" pipe thread ports 7/32" restriction Pressure ranges from 1 to 4 PSI Includes mounting bracket Satin finish See more product details + + Total price: $115.81 Add all three to Cart These items are shipped from and sold by different sellers. Wouldn't the water still evaporate at the same temp? The owner had tried all practical means to reduce the heat gain of the fuel system but with little improvement. Please try again. Cool. Holley 12-804 Fuel Pressure Regulator - amazon.ca In this document is a chart for Seasonal Gasoline Specifications. From that time on octane ratings slowly rose, helped by the addition of more and more tetraethyl lead. As you can see in the photo it's gold, (the same colour as what's in the model 12-803) I called Holley directly and customer service is acting like they're unaware of the issue, even though I've read threads online going as far back as 2018 mentioning this. 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. 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. 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 unit however is working fine but am curious about the missing gaskets and how important they are? Holley low pressure reg woes #12-804. Copyright 1995-2021 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. I will be trying one of these but am curious what is the active ingredient(s). Chemistry does NOT work that way - just like adding more any one ingredient to a cake mix will make the cake better. In fact I can completely remove the adjusting screw and it still does not go down to 3psi. This is the complex world of Chemistry - which is far too complex to go into here. Then I got this good one, to try to get 1.5 PSI to the Kadrons. Copyright 2023, Antique Automobile Club of America. [endif]-->