Like many others, I have been considering what to do recently. Holley's products include carburetors, fuel pumps, fuel injection, intake manifolds, and much more. This is another vexing problem with Ethanol mix, which is about all you can get here in CT. This went on until they developed the cracking process which allowed more flexibility in what they got out of the crude. I do not think we hi-jacked the thread - the article is not even available anymore online to read. Enhancements you chose aren't available for this seller. Reviewed in the United Kingdom on January 31, 2016, Reviewed in Canada on January 27, 2023, Reviewed in Canada on December 18, 2019, Reviewed in Canada on November 10, 2020, Automotive Performance Fuel Injection Systems, Automotive Replacement Fuel Injection Pressure Regulators, Learn more how customers reviews work on Amazon, Holley 12-804 Reg, Fuel Press 1-4 Psi Pol. 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. Designed using state-of-the-art technology and with customers in mind. Check "Reid Vapor Pressure" in Wikipedia, or similar. The vapor lock issues that I have are with 1920's Packards where the fuel system is essentially at atmospheric pressure throughout. f9vxY"IpBQ? Will buy again if I need another one for a different project. Call 800.979.0122, 7am-10pm, everyday. They put everything they could into the coal oil including what we would consider low grade gasoline. 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. Reviewed in the United States on September 4, 2017. Kerosene diesel fuel or stove oil will work. 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. . . Was actually disappointed with the quality of the regulator. 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. [{"displayPrice":"$58.17","priceAmount":58.17,"currencySymbol":"$","integerValue":"58","decimalSeparator":".","fractionalValue":"17","symbolPosition":"left","hasSpace":false,"showFractionalPartIfEmpty":true,"offerListingId":"UhTnfcw7IZxaNntXlJwDKCZdMn2swwW9Qa8PxzrWBz%2By8RC0ilxVsHIj8toGUO%2FPmmF8b2HD1iNYooZ7n4ER0XuKiQsQQvJG86lgqsni6KYZs%2FdLcIOIE0Ukulbz%2BJYBuUOC820ciUZxU2UEL9sUjtoq8gdk8bOPIZ3QChg8zpgyIZxlTaXQEA%3D%3D","locale":"en-US","buyingOptionType":"NEW"}]. 0 Click here to find a But, . 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. The unit however is working fine but am curious about the missing gaskets and how important they are? When it does light - the flame spread is faster but not so fast as to "knock" or be a violent explosive hard burn of the fuel. You set it to the exact fuel pressure you want. 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. This part is Backordered. It's not the vendor's fault, these things should have been recalled, or the vendors made aware of the issue so that they could be inspected before they're sold. The peak was reached in the sixties when heavily leaded gas of over 100 octane was available. The fuel pressure is at 1 - 3 psig since the pump is not running. Our payment security system encrypts your information during transmission. I had a chrome dial regulator, which leaked gas everywhere but luckily didn't actually burn down my ride. Product very good. I installed this on my Onan 7000 generator as part of a project to resolve vapor lock issues in hot weather and high altitudes. Lots of Chinese Holley 12-803, 804 etc knock-offs are available. Some parts are not legal for use in California or other states with similar regulations. Two Port By These will raise the boiling point of the fuel but reduce the octane. Wouldn't the water still evaporate at the same temp? See Standard conditions for temperature and pressure - Wikipedia, the free encyclopedia. This product is made of high-quality materials to serve you for years to come. 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. Can anyone speak to the validity of this or is anyone currently using an additive for this? . 2-Port Carbureted Fuel Pressure Regulator (12-804) by Holley. The seller gratefully sent me a replacement part but the result was the same. if you run a holley blue pump it is set at 14psi from the factory and you must run the regulator that came with the pump . For cars that require 4.5 to 9 PSI, the Holley 12-803 is the right model. Brief content visible, double tap to read full content. It was not. 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. . To ensure this condition, the installation of a Holley 12-810 oil pressure safety switch is recommended 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. I installed this on my Onan 7000 generator as part of a project to resolve vapor lock issues in hot weather and high altitudes. Adjustable from 1 to 4 PSI. I did, works great & looks beautiful. 12-804 12-500 Low-Pressure Fuel Regulator (std. Hi Bob, I can get a hold of some 99.7% pure ethyl acetate cheap. I'm suggesting to raise the boiling point by adding heavier or oilier substances such as kerosene. 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. May God's grace bless you in the Lord Jesus Christ. 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. Thinking Kerosene is probably the way I will go at this point. 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. Copyright 2023, Antique Automobile Club of America. Decrease pressure by turning the adjustment screw counter-clockwise. 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. Of course you may already have this setup - that is the first issue. store 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. ESPECIALLY a 10% ethanol blend - once generically called the gasohol summer blend in that vapor system would really be a problem. Shipping cost, delivery date, and order total (including tax) shown at checkout. P/N 12-803, 12-803BP, & 12-804 Installation Instructions 199R7914-3 NOTE: 12-803BP IS NOT TO BE USED WITH MECHANICAL FUEL PUMPS! 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. wrapped around the fuel lines. 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. I feel I am 95% there, and a slight improvement would be all I need - for now, that is unless the ethanal mix changes (your tax dollars at work). If you put in too much you can return the fuel to some "kick" without knock with a small amount of acetone. ***The inlet pressure limitation is 7 psi. Bobburns thank you for the confirmation and technical explanation. Q: 9517377223. 12-804) is a Low Pressure (1-4 PSI) regulator. 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. By the way, I had an excellent service from this seller (5 stars!). . Generally speaking if your car was made before 1953 it has low compression. Most regulators need to be flowing to set pressure. MFG. Use with standard pump only - not recommended for maximum pressure pumps. . All petroleum distillates have different chemical properties which change depending on what you mix them with. Two 3/8" nipples/hose connections and a 3/8" to 1/8" reducer. Reid Vapor Pressure (RVP) is a commonly used indicator of gasoline volatility. Terms of Service. What if any additives would do this and why? 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 . This will ensure that the pump will not continue to operate after the engine is . Holley Bracket Secondary Adjusting Lever Kit Steel Gold Iridited Holley 4150. The reg takes 3/8" fittings and the gauge takes 1/8" fittings. ***The inlet pressure limitation is 7 psi. holley blue fuelpump pressure erratic. A vapor lock condition would be caused. The Holley 12-804 fuel pressure regulator features 3/8" NPT in/out ports. There is no hard and fast cutoff for any of these. Octane is an actual chemical which would be at the light end of the scale for gas, kerosene would be at the heavy end. It is no different than mixing water with ethylene glycol to make what we call anti freeze or with methanol to make windshield washer fluid - you get a completely different product - it is not just water any more; and nor can you separate them back into their original separate entities - so you cannot think of them that way any more either. 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. Interesting that the writer suggests certain additives can raise boiling point of gas in the first section. Somewhat of an inconvenience but that's why it's probably cheaper than other places selling the same part number. [endif]-->. 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 $41.19. 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. They sold more gas than coal oil. The term heavy ends may be old fashioned and obsolete. That was in the 1990s, so you can project to more current times and suspect we have something more sophisticated now. 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. Copyright 2008-2023 OReilly Wont be good for a finicky carb. Some of these items ship sooner than the others. A: 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. I got all of my supplies in the Home Depot fittings section. A: Recommended Parts. Reasonable . Holley fuel pressure regulators are designed to precisely control the fuel pressure from the fuel pump to the carburetor. 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. 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. NPT Inlet Attachment: Learn more about our Does this mean that we are back to the situation described by OD where the lower boiling point additive reduces only the average boiling point? 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. Did not like having to reset to zerobut I did. The other possibility is that it is due to the higher pump pressure. Then I got this good one, to try to get 1.5 PSI to the Kadrons. FREE SHIPPING on most orders of $35+ & FREE PICKUP IN STORE. Part Number: HLY-12-803. 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. Loosening the regulator locknut and turning the adjustment screw clockwise increases the pressure. Gasoline was so light if you left the cap off a gallon can it would all evaporate in a few days. "Pure" Ethyl Acetate could be called an "alcohol" as Ethyl acetate is the ester of ethanol and acetic acid; and it is manufactured on a large scale for use as a solvent. WARNING: Operating, servicing and maintaining a passenger vehicle or off-road vehicle can expose you to chemicals including engine exhaust, carbon monoxide, phthalates, and lead, which are known to the State of California to cause cancer and birth defects or other reproductive harm. One needs to have studied Chemistry as I have to actually know how this works. ${cardName} unavailable for quantities greater than ${maxQuantity}. This item can be returned in its original condition for a full refund or replacement within 30 days of receipt. Exclusive, high-quality Global Featured Holley Transmission Kickdown Cable Bracket 20-121; Gold Zinc Steel for 700R4 . 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. Browse In Stock and Ready to Ship Alternatives, Universal Fit, 1-4 Fuel Pressure Rating (psi), Aluminum. A long time ago it was in use in the oil business. You need to be a member in order to leave a comment. I tried to bring the 0-140 pressure feed regulator down to 30 by adjusting the two - to up the return flow and lower the feed pressure - but the 15 psi reg I had just worked on started to climb past 9. It appears this one needs 40 to 50 minimum. . Try it, I think you will find it works. If the carbs are drawing fuel and you lower the pressure at the reg, it should show on the gauge. Street/Strip Carbureted Applications 2023 Holley Performance Products, Inc. All Rights Reserved. Check the status of your 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. Holley Fuel Pressure Regulators 12-803 HLY-12-803. Overview. I put it . A small amount of IMCT in gasoline - depending on whether it is the winter or summer blend - depending on what that is as a fuel where you are - raises the boiling point like kerosene or diesel - but also raises or maintains the octane level slightly as ethyl acetate tends to loosen the hydrogen bonds and lets mixture burn more completely without causing pre-ignition we call "detonation" - which is really simply a slight lowering of the "autoignition temperature". if you were packing them in boxes they would look identical. Carb Part, 14 PSI Fuel Pressure Regulator Set 3/8in NPT Port 12804 for Holley : Amazon.com.au: Automotive Yes the light elements will still be in there. Too much anti-freeze - (typically ethylene glycol) causes the opposite effect even under pressure of the cooling system. So they started putting more of the low grade gas, or high grade kerosene into the gas. 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. If this is true, how come adding antifreeze to water raises the boiling point? Works, don't use a liquid filled gauge in an engine compartment! Then, we got what was loosely described as winter gas, all year round, with RFG. This is the complex world of Chemistry - which is far too complex to go into here. The 12-804 is made from durable aluminum and has a satin chrome finish that is extremely resilient to corrosion and abrasive chemicals. 9 really is max. near you The owner had tried all practical means to reduce the heat gain of the fuel system but with little improvement. Holley's products also include performance fuel pumps, intake manifolds and engine dress-up products for street performance, race and marine applications. In refining crude oil they distill it to separate out the different products. 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. Steve_Mack_CT (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). This part is legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles. Some Holley 12-803 4.5-9 psi and 12-804 1-4 psi regulators mislabeled from factory. 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 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. 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. Copyright 1995-2021 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. (that is this one in the image below) The adjustment spring under the adjustment screw is pushing down on the diaphragm holding the ball off it's seat. Gauge looks small..it is not. [endif]-->