I've had some luck using LeadMax2000 but it's not a 100% cure. 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. 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. Refineries have been doing this for decades. 4.9. ). Add some heavy ends. 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. Never had it act up while running, but since E10 fuel came along it is borderline getting started after hot shutdowns. 9517377223. Reviewed in the United States on June 20, 2021. Discussion in 'The Hokey Ass Message Board' started by oldrelics, Oct 12, 2010. Great feedback from a knowledgeable group, guys! ", So . Holley 804 fuel pressure regulator install - YouTube 0:00 / 5:58 Holley 804 fuel pressure regulator install Schnebs Garage 2.42K subscribers Join Subscribe 72 Share Save 15K views 3 years ago. The regulator is a Holley 12-804, I was told it went down to 1 psi and I have a stock mechanical fuel pump. 12-804 Part Type: Fuel Pressure Regulators Product Line: Holley Fuel Pressure Regulators Summit Racing Part Number: HLY-12-804 UPC: 090127020234 Regulator Pressure (psi): 1-4 Regulator Style: Non-return Regulator Location: Inline Boost/Vacuum Reference Port: No Gauge Port: No Inlet Quantity: 1 Regulator Inlet Size: 3/8 in. By => https://www.holley.com/data/Products/Technical/199R7914-3rev3.pdf. #2. All Holley regulators are pre-set at the factory at 2.8 PSI so there is no guesswork when first installing the regulator. Holley low pressure reg woes #12-804. This satin finish regulator feature 3/8 pipe thread . order Kerosene diesel fuel or stove oil will work. 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. I had hoped that the cooler fuel from the electric pump would solve the problem but it did not. 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). Learn more about our Each Holley fuel pressure regulator is fully adjustable so regulating the fuel pressure to your engines needs is a simple task. The Holley 12-804 is a 1 to 4 range PSI regulator. Decrease pressure by turning the adjustment screw counter-clockwise. What if any additives would do this and why? Please refresh and try again. We work hard to protect your security and privacy. 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. From start to finish, Holley has the parts to make your dream a reality. A: . Interesting theory. Yes the light elements will still be in there. 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. 3/8Inch Npt Ports 1 Inch 2 Out. 12-804 12-500 Low-Pressure Fuel Regulator (std. Lots of Chinese Holley 12-803, 804 etc knock-offs are available. The two will be very close to the same just as would Water and Anti-Freeze boiled in an open pot. The other part numbers utilize an AN O-ring inlet, outlet, & return ports, and do not require any sealer on the threads. The ethyl acetate in the IMCT loosens hydrogen bonds on the gasoline making it easier to light to burn, but the "oil" - heavier hydro-carbon nature keeps the vapor point higher and flash point still low enough to give good performance. Rusty, thanks so much for this information. The reg takes 3/8" fittings and the gauge takes 1/8" fittings. The following vehicles are considered Emissions Controlled Vehicles: *Free Shipping & Handling only offered to the contiguous US on orders over $100, excludes clearance parts and oversized packages. If you have it plumbed up "dead headed", lowering the pressure might not react very quickly. Holley 12-807 Fuel Pressure Regulator Diaphragm Repair Kit made by Holley, for as low as $9.21. Rusty said any heavier hydrocarbon WILL raise the boiling point - and I said Rusty is correct and OD is wrong. Seems like the first "RFG" was closer to the old "winter" blend, which had more higher-end distillates so it'd vaporize nicely in cooler weather. Enhancements you chose aren't available for this seller. 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. Worked well out of the box. Holley 12-840 4.5-9 PSI Adjustable Billet Fuel Pressure Regulator with 3/8" NTP Ports,Black Anodized Brand: Holley 24 ratings | 11 answered questions $10902 & FREE Returns The package length is 9.652 centimeters The package height is 6.604 centimeters The package width is 9.144 centimeters Package Weight : 0.2 pounds See more product details A long time ago it was in use in the oil business. 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. Please make sure that you are posting in the form of a question. [endif]--> Many thanks for taking the time to clarify this interesting subject . If youre looking to dial it in accurately its not going to do it. 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 This part is legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles. The issue is simple that one is seeking to "re-blend" their own gasoline from one already sold. At first it seemed fine, set it to 1.5 PSI and away we go. Holley fuel pressure regulators are designed to precisely control the fuel pressure from the fuel pump to the carburetor. On occasions here in NZ, we get extreme heat and old cars vaporlock. 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. Can you adjust the fuel pressure? Try it, I think you will find it works. I have a holley low pressure reg. 2023 Holley Performance Products, Inc. All Rights Reserved. The regulator that was shipped to me has an internal spring from a different model of regulator, the spring should be red. The Holley 12-804 fuel pressure regulator features 3/8" NPT in/out ports. (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. Holley Fuel Pressure Regulators 12-803 HLY-12-803. The intent being to get "cool" fuel to the carburettor bypassing the areas where the system heats the fuel. Thus the "lowest boiling point are the cause of vapour lock" is also NOT CORRECT thinking. loyalty program Note also that PURE ethylene glycol is also flammable but also miscible with water. The Holley Fuel Pressure Regulator (Part No. My bypass line has a shut-off valve that I can use to manually adjust the pressure, but when air bubbles develop within the input fuel line, this valve requires adjustment to maintain the fuel pressure. Spring clothes pins, aluminium foil, wet burlap, etc. Depending what your compression is you could add 5% kerosene up to 25% for cars from the 20s with very low compression, like 5:1 or less. The regulator that was shipped to me has an internal spring from a different model of regulator, the spring should be red. do you have a picture of it hooked up? 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. The summer gasoline vaporizes in the line and the heat soak is quicker and longer on hot day's. Ships from and sold by Performance Guarantee. Adjustable Fuel Regulation From 1 To 4 PSI .220 Inch 7/32 Inch Restriction. Some of these items ship sooner than the others. wrapped around the fuel lines. The other possibility is that it is due to the higher pump pressure. CALIFORNIA WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov. You could arrange them on a scale from naptha gas, gasoline, kerosene, stove oil, diesel fuel, light lubricating oil, heavy lubricating oil, grease, asphalt. I recently fitted an electric fuel pump to one of the cars. Driving on a warm day in heavy stop start traffic it started vapor locking on a climb - using 10% ethanol fuel with no additive . 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. Holley part number for the kit is 12-807; Summit sells it for about $6. Now, Holley EFI is dominating the performance world as well as our products for GM's LS engine. NOTE: P/Ns 12-841, 12-842, & 12-879 utilize 3/8" NPT inlets and outlets. Holley's instructions say, ". 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. 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. 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. Free shipping for many products! ***The inlet pressure limitation is 7 psi. Privacy Policy. Could you explain a little more about how you would run the bypass? The 12-803 BP is a By-Pass design of the same style. I turned into a side street and opened the hood. Can anyone speak to the validity of this or is anyone currently using an additive for this? 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. Copyright 2023, Antique Automobile Club of America. IMCT is found in the paint isle of any hardware or home improvement store usually in quart or gallon cans. I have the one I have set up in a deadhead setup. Most regulators need to be flowing to set pressure. Then I got this good one, to try to get 1.5 PSI to the Kadrons. . 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. A larger tank might need two quarts. I cannot help you - and no one can without knowing the exact make up of the gasoline being refined where you are. What you write in post 12 is NOT correct. Easy to read. If this is true, how come adding antifreeze to water raises the boiling point? f9vxY"IpBQ? This ensures that it's set too low. 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. 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". How much should I add to every gallon of gas.I believe they are adding about 5% ethanol to the fuel here. A vapor lock condition would be caused. . . 10 in stock. I installed this on my Onan 7000 generator as part of a project to resolve vapor lock issues in hot weather and high altitudes. Reasonable . 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 . 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. For any further assistance please feel free to call us at: 1-877-238-2623 or visit the nearest Advance Auto store and one of our representatives will gladly assist you with any questions or concerns you may have. Your question might be answered by sellers, manufacturers, or customers who bought this product. Generally speaking if your car was made before 1953 it has low compression. ESPECIALLY a 10% ethanol blend - once generically called the gasohol summer blend in that vapor system would really be a problem. I do not have a pressure regulating valve to reduce the pressure from the pump but it works fine with no flooding under normal conditions and I have fitted a modern soft seat to the float cut off needle. 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. 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. Holley's products include carburetors, fuel pumps, fuel injection, intake manifolds, and much more. Keep in mind that when there is pressure in the line, backing off on the adjustment isn't going to make the pressure go down. Our payment security system encrypts your information during transmission. 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. Product very good. See Standard conditions for temperature and pressure - Wikipedia, the free encyclopedia. The fuel pressure is at 1 - 3 psig since the pump is not running. It does however produce an irritating fume that irritates the eyes and mucous membranes when burning in gasoline. [endif]-->