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.". Product very good. But, . I do not think we hi-jacked the thread - the article is not even available anymore online to read. Takes a little time to peel back the rubber case then remove the glass with a fine blade screwdriver, reset to zero. Adjusting Holley & Demon Mixture Screws; Holley Specs HP Series; Edelbrock Carburetor Specs; Holley Double Pumper 4150 Specs; Carter Competition Series AFB Specs; Company Info. Unfortunately, this fuel pressure regulator does not even come close to regulating the pressure and keeping the pressure down. Yes. Gasoline vaporizes according to fuel system pressure. One is a deadhead and one is a by-pass. readings of the carb. ESPECIALLY a 10% ethanol blend - once generically called the gasohol summer blend in that vapor system would really be a problem. 12-804 12-500 Low-Pressure Fuel Regulator (std. So they started putting more of the low grade gas, or high grade kerosene into the gas. Accurate description. 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. Browse In Stock and Ready to Ship Alternatives, Universal Fit, 1-4 Fuel Pressure Rating (psi), Aluminum. The Holley Fuel Pressure Regulator (Part No. #2. My car runs and idles fine with no flooding when running with the electric pump, the flooding only occurred once when it vapor locked. The Holley 12-804 fuel pressure regulator features 3/8" NPT in/out ports. ***The inlet pressure limitation is 7 psi. 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. 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. Is it a product that would be sold by a panel beater's supply shop? May God's grace bless you in the Lord Jesus Christ. 1996-2023, Amazon.com, Inc. or its affiliates, Select a location to see product availability, Holley HOL 12-804 12-804 Fuel Pressure Regulator. 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. I had a chrome dial regulator, which leaked gas everywhere but luckily didn't actually burn down my ride. 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. From that time on octane ratings slowly rose, helped by the addition of more and more tetraethyl lead. Holley recommends applying PTFE paste to the NPT thread of the fittings before installation on these applications. 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". I am having problems understanding why you say OD is wrong and Rusty is correct, it seems to me you are all saying much the same and that is that gasoline is made up of many components each having different boiling points and the components with the lowest boiling point are the cause of vapour lock. IMCT is found in the paint isle of any hardware or home improvement store usually in quart or gallon cans. We dont share your credit card details with third-party sellers, and we dont sell your information to others. bowls after each run, just to see exactly at what temperature the problems become apparent. The Holley 12-804 is a 1 to 4 range PSI regulator. 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. The seller gratefully sent me a replacement part but the result was the same. This part is Backordered. FREE SHIPPING on most orders of $35+ & FREE PICKUP IN STORE. Changing the vapor pressure (and thus the boiling point) of gasoline is not new. Some parts are not legal for use in California or other states with similar regulations. Any thoughts on this? If you have it plumbed up "dead headed", lowering the pressure might not react very quickly. It appears this one needs 40 to 50 minimum. To see our price, add these items to your cart. '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 . By 1913 it was the other way around. 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. 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. 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. 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. CALIFORNIA WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov. I installed this on my Onan 7000 generator as part of a project to resolve vapor lock issues in hot weather and high altitudes. So with that vapor fueling system - you are stuck "downgrading it" to a lower quality fuel. . Click here to find a 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. I have just this Spring started taking temp. Discussion in 'The Hokey Ass Message Board' started by oldrelics, Oct 12, 2010. I have heard true lead (LeadMax2000 or simillar) may do this as well? On occasions here in NZ, we get extreme heat and old cars vaporlock. All Holley regulators are pre-set at the factory at 2.8 PSI so there is no guesswork when first installing the regulator. Use with standard pump only -not recommended for maximum pressure pumps. I am not going to quote all you said, but the flooding from the electric pump was caused by too much fuel pressure over coming the needle seat (or whatever kind of seat it has for the bowl) of the carburetor. 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. I have adjusted a 6-9 lbs pump down. Though I once has it working with only two 0-140 regulators, and since I had messed with the 0-140 regulator on the carb feed side trying to get it to work previously - it popped up to 50 psi - but the 15 psi reg held at 9 psi to the carb - for about 5 minutes, until I tried to reduce the 0-140 below 50 psi. This item can be returned in its original condition for a full refund or replacement within 30 days of receipt. 2023 Holley Performance Products, Inc. All Rights Reserved. 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. We currently do not have an estimate when this item will ship. Of course you may already have this setup - that is the first issue. This Holley universal low pressure fuel regulator is factory-set to 2.7 PSI, but is fully adjustable from 1 to 4 PSI. Your question might be answered by sellers, manufacturers, or customers who bought this product. Spring clothes pins, aluminium foil, wet burlap, etc. Quadrajets should have 6 to 9 at the inlet or they flood past the needle seats. Boiling is a violent version of vaporizing. 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. WARNING! If the carbs are drawing fuel and you lower the pressure at the reg, it should show on the gauge. 3/8 Inch NPT Ports 1 Inch 2 Out. Reviewed in the United States on April 2, 2022. 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. 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. (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. . Never tried it with my old Model A Ford but I heard that they will actually run on Kerosene.. 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. With this set up, pressures throughout system varies only very slightly from atmospheric, lower up to the vacuum tank and higher in the gravity feed from the vacuum tank to the carburettor. Stay up to date with the latest releases, events, promotions and more. 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 Adjustable Fuel Regulation From 1 To 4 PSI.220 Inch 7/32 Inch Restriction. P/N 12-803, 12-501, 12-804, 12-500, & 15812NOS Installation Instructions WARNING! Starting in 1970 leaded gas was taken off the market resulting in the gas we have today. 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. We are sorry. I do wish there were some stamped values on the adjustment screw like other models I have seen. Note also that PURE ethylene glycol is also flammable but also miscible with water. A: Mr. Gasket 1561 Fuel Pressure Gauge 1.500 in. Otherwise it's good. Reid Vapor Pressure (RVP) is a commonly used indicator of gasoline volatility. Troubleshooting Carburetor Problems and Vaporlock Blues Revisited - Hagerty Lifestyle. The BALL shuts off the fuel flow until the pressure on the other side of it lets fuel get past it to keep the pressure constant. 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. 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. Error posting question. I would welcome your advice on this - with apologies for the length of this post. 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. ${cardName} unavailable for quantities greater than ${maxQuantity}. At first it seemed fine, set it to 1.5 PSI and away we go. Quick & Hassle Free. The chemistry class experiment you are referring to will yield the approximate boiling (vapor) point at STP - Standard Temperature and Pressure ONLY. [endif]-->