holley 12 804 adjustment

1 oz per gallon - not more than 2 is usually in the right "goldie-locks" range. Recommended Parts. Open the unit and check the spring color, Reviewed in the United States on April 9, 2018. It needed a bit of adjusting for my purpose, but other than that, it performed perfectly. It is as said - of the "paint thinner" family in weight with ehtyl acetate blended in to make it's solvency properties a little "hotter " and stronger. Why does this occur only under increased pressure? The chemistry class experiment you are referring to will yield the approximate boiling (vapor) point at STP - Standard Temperature and Pressure ONLY. See also Tom Ogle's "modern" vapor fueling system - google it. 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. All Holley regulators are pre-set at the factory at 2.8 PSI so there is no guesswork when first installing the regulator. 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. Full content visible, double tap to read brief content. I look upon that effort with a heavy heart though, for I have been religious about keeping the old car original as possible. 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. I Have problems with the fuel temp in my 1937 Buick. I recently fitted an electric fuel pump to one of the cars. So with that vapor fueling system - you are stuck "downgrading it" to a lower quality fuel. What we call gasoline - as Rusty showed; is blended today - and the various chemicals blended into it for the various regions and state laws make it a special product where you BUY it. Reviewed in the United States on January 15, 2021. 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. Gasoline at the pump is a blend of different chemicals. 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. To avoid extra back pressure on the pump, and to keep cool fuel flow past the lowest pressure point in the fuel system; a by-pass line should be used and it should NOT "dead head" to the carburetor - that is put the return line as close to the carburetor inlet as possible. No issues. 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. Use with standard pump only - not recommended for maximum pressure pumps. This ensures that it's set too low. 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. Lots of Chinese Holley 12-803, 804 etc knock-offs are available. They sold more gas than coal oil. Somewhat of an inconvenience but that's why it's probably cheaper than other places selling the same part number. The carb should not flood even with the pump running unless it is putting out enough pressure to over come the float bowl shut off mannerism mechanism of the carb. 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. Regards, Mike. Reasonable . Did not like having to reset to zerobut I did. 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. 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. Holley recommends applying PTFE paste to the NPT thread of the fittings before installation on these applications. The two will be very close to the same just as would Water and Anti-Freeze boiled in an open pot. However the part number on the box was 12-804 which should be a 1-4 psi regulator BUT the Part number etched on the unit was 12-804 4.5-9 psi which doesnt exist. This item cannot be shipped to your selected delivery location. 2-Port Carbureted Fuel Pressure Regulator (12-804) by Holley. At first it seemed fine, set it to 1.5 PSI and away we go. 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. Any of these heavier than gasoline petroleum distillates above will raise the vapor point of gasoline if mixed into it. Error posting question. Changing the vapor pressure (and thus the boiling point) of gasoline is not new. ***The inlet pressure limitation is 7 psi. [endif]-->. It will get you close. The reg takes 3/8" fittings and the gauge takes 1/8" fittings. Chemistry does NOT work that way - just like adding more any one ingredient to a cake mix will make the cake better. Putting kerosene into gasoline - while both are hydrocarbons - and they will blend - the lighter oil nature of the kerosene to the solvent of gasoline; in an amount of 5% is not enough to change the STP vapor point of the gasoline, but it will weaken the octane rating of the gasoline enough to feel it under acceleration AND under pressure will raise the vapor point enough to perhaps prevent vapor lock depending on the ambient and under hood temperatures of where one is located. 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. Product very good. 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. Worked well out of the box. Two 3/8" nipples/hose connections and a 3/8" to 1/8" reducer. It's easy! Is it a product that would be sold by a panel beater's supply shop? Each Holley fuel pressure regulator is fully adjustable so regulating the fuel pressure to your engines needs is a simple task. ***The inlet pressure limitation is 7 psi. What you write in post 12 is NOT correct. Got a gauge on the FPR to monitor, and at first it was great. 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. . Sign up for a new account in our community. 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. Adjusting Holley & Demon Mixture Screws; Holley Specs HP Series; Edelbrock Carburetor Specs; Holley Double Pumper 4150 Specs; Carter Competition Series AFB Specs; Company Info. Exclusive, high-quality Global Featured Holley Transmission Kickdown Cable Bracket 20-121; Gold Zinc Steel for 700R4 . Adjustable Fuel Regulation From 1 To 4 PSI.220 Inch 7/32 Inch Restriction. Two Port Bobburns thank you for the confirmation and technical explanation. Terms of Service. Boiling is a violent version of vaporizing. I have no idea - you are in uncharted territory. Unfortunately, these FPR are now made in Korea and they no longer include an alternate spring. Privacy Policy. 10 in stock. The check ball is held shut with the diaphragm and spring and once the desired fuel pressure builds up it opens that valve and allows fuel to go back to the tank. But it is not the ethyl acetate alone that causes the effect to raise the vapor temperature point of fuel. 3 0 obj <>stream I'm suggesting to raise the boiling point by adding heavier or oilier substances such as kerosene. So the goal is to raise the vapor point temperature without lowering the auto-ignition temperature or flash point or flame spread speed - or increasing the flame spread speed too much. To see our price, add these items to your cart. What I would do, is with the car off, (or electric pump off), turn the screw a good ways out. Can i install a fuel pressure guage on the unit itself? A long time ago it was in use in the oil business. (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). Never tried it with my old Model A Ford but I heard that they will actually run on Kerosene.. 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. 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. ;b DK%*DO[%A IPd?Q~]=n1)E1D*q`D fF-"4N3i4\1uOn(@%c0IHQg`~uKVf{/r0d2}XVXi1-tpE1K[T*3"IS0v27UfTajff`"(dJD0fFlvryT{?:VUusSqD?R$LlalK&@$8q'qbSEv All kinds of remedies were tried. But, . As the car is parked Temperature. So, I take the reg apart to see if it is all clean and looks good. Will rise to above 180 degrees on the Temperature gauge. $12.15: ac000400: Front Axle Beam Bushing Reamer For 1.34 Up To 1.50 Diameter . Most certainly also, should that be successful, I will then experiment with IMCT as well. Of course you may already have this setup - that is the first issue. store Holley Performance Products has been the undisputed leader in fuel systems for over 100 years. There is a light spring that helps push the ball against the the seat in the direction of the fuel flow. Rich boys replaced their 216 stovebolt 6's with GMC 270 or 302 sixes with a performance "full race" cam. Thanks again fellows, for such informative posts. Log In / Register Order Status. LASTLY on your first issue of understanding vapor lock and boiling point. The issue is simple that one is seeking to "re-blend" their own gasoline from one already sold. Talk to the experts. Turn the screw out to lower the pressure. I recall when Texaco used to advertise their "customized for your area" gasoline, in the earlier 1960s. The Holley Fuel Pressure Regulator (Part No. We dont share your credit card details with third-party sellers, and we dont sell your information to others. I cannot help you - and no one can without knowing the exact make up of the gasoline being refined where you are. No mention of vapor lock issues, but engine de-carbon activities. Then I got this good one, to try to get 1.5 PSI to the Kadrons. Holley Bracket Secondary Adjusting Lever Kit Steel Gold Iridited Holley 4150. 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. Interesting that the writer suggests certain additives can raise boiling point of gas in the first section. 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. The pressure regulator works fine when mounted flat, but should work ok when mounted on it. Much of the excess engine heat will end up soaking the fuel system under the hood. That's where the pressure was going. 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. The peak was reached in the sixties when heavily leaded gas of over 100 octane was available. The regulator is a Holley 12-804, I was told it went down to 1 psi and I have a stock mechanical fuel pump. So in an open cup the boiling points would also appear the same as water but under pressure the boiling point is different. The vapor lock issues that I have are with 1920's Packards where the fuel system is essentially at atmospheric pressure throughout. Holley's instructions say, ". 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. 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. 1996-2023, Amazon.com, Inc. or its affiliates, Select a location to see product availability, Holley HOL 12-804 12-804 Fuel Pressure Regulator. 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! Had to reset to Zero. Fuel pump regulator has 3/8" NPT inlet/outlet ports. . On occasions here in NZ, we get extreme heat and old cars vaporlock. I've had some luck using LeadMax2000 but it's not a 100% cure. The 12-803 BP is a By-Pass design of the same style. It IS variable and a result of the various fuel blend components. Shipping cost, delivery date, and order total (including tax) shown at checkout. This will keep your pressure steady and have instant pressure change when adjusting. 12-804) is a Low Pressure (1-4 PSI) regulator. near you None of them worked. 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. 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. Average for the last 12 months. . 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. If so how? Rusty said any heavier hydrocarbon WILL raise the boiling point - and I said Rusty is correct and OD is wrong. Purchased the regulator from Baxter, unit arrived in 4 days.. September 21, 2010 in Technical. Holley Fuel Pressure Regulator Rebuild 12-804 - YouTube 0:00 / 37:53 Holley Fuel Pressure Regulator Rebuild 12-804 DurocShark 309 subscribers Subscribe 10K views 3 years ago I walk through. #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? Does this need to be mounted upright or is it ok on its side? Point and secure it into a clean container Inlet pressure of 7 psi limitation means your pump can not put out more than 7 psi to the regulator for it to properly operate.