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. [endif]-->. couple more questions, Rusty, what exactly are "heavy ends"? fuel pressure in at the top, fuel pressure out on each side. Reasonable . Thanks again fellows, for such informative posts. CALIFORNIA WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov. Holley fuel pressure regulators are designed to precisely control the fuel pressure from the fuel pump to the carburetor. Each Holley fuel pressure regulator is fully adjustable so regulating the fuel pressure to your engines needs is a simple task. . If this is true, how come adding antifreeze to water raises the boiling point? Rich boys replaced their 216 stovebolt 6's with GMC 270 or 302 sixes with a performance "full race" cam. Auto Parts v 6c02f45cd (2fvgn) cv1440. When I got it to down to 30 - then the 0-15 psi reg would not hold anymore and climbed to 15 flooding out the engine. None of them worked. => https://www.holley.com/data/Products/Technical/199R7914-3rev3.pdf. 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. He finally achieved significant improvement by fitting a vent to the carburettor top (which is routed away and under the car for safety). 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. 03-28-2012, 03:04 AM. Click here to find a I adjust it up to 2.5 pounds and clean my hands. Holley 12-804 Fuel Pressure Regulator 3/8 pipe thread ports 7/32 restriction Pressure ranges from 1 to 4 PSI Includes mounting bracket Satin finish 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. 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. Fuel Pressure Regulator; Holley fuel pressure regulators are designed to precisely control the fuel pressure from the fuel pump to the carburetor. te4cmCbGnt]&~`N@RPyBTa$=~fo:/T 92YE)3Uofo4Ou].-zowDt*ae^qf9z/?. To ensure this condition, the installation of a Holley 12-810 oil pressure safety switch is recommended Like many others, I have been considering what to do recently. Quadrajets should have 6 to 9 at the inlet or they flood past the needle seats. Does this need to be mounted upright or is it ok on its side? A: 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. Copyright 2008-2023 OReilly 12-804 : Quantity: Share : . Holley part number for the kit is 12-807; Summit sells it for about $6. By the way, I had an excellent service from this seller (5 stars!). So they started putting more of the low grade gas, or high grade kerosene into the gas. 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. If so how? 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. Easy to read. Will changing the orientation change the preset pressure setting (checkball falling instead of raising)? Posts: 32372. Street/Strip Carbureted Applications Shopping Cart Thanks for the comments, I am aware of the need for a regulating valve to reduce the pump pressure and would have fitted one except that I was advised by the owner of an identical car to mine that his car does not flood using the same electric pump without a regulator, it is only a 2.5 -4 psi pump. The reg takes 3/8" fittings and the gauge takes 1/8" fittings. Had to reset to Zero. But, . TURNING THE ADJUSTMENT SCREW ALL THE WAY IN WILL RESULT IN EXCESSIVE FUEL PRESSURE . Adjustable from 1 to 4 PSI. Most certainly also, should that be successful, I will then experiment with IMCT as well. Mounting Bracket Included. Today's cars are all fuel injection so it doesn't matter how easily the gas evaporates, it is under pressure in a closed system from the tank to the intake. To see our price, add these items to your cart. 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. IMCT is a "new product" from Klean-Strip they call "Industrial Maintenance Coating Thinner" that provides good solvency and can be used in place of MEK, Toluene, Xylene and VM&P Naphtha for thinning Industrial Maintenance Coatings. Q: Free Shipping - Holley Fuel Pressure Regulators with qualifying orders of $99. 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. I would like to try IMCT, how is it sold? . I have the one I have set up in a deadhead setup. 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. In those days before 1905 kerosene had a strong piercing odor and coal oil lamps sometimes exploded. I take this to mean that the separate boiling points of the constituents occur at atmospheric pressure but at higher pressure the resulting mix has a single boiling point. [endif]--> Many thanks for taking the time to clarify this interesting subject . I had hoped that the cooler fuel from the electric pump would solve the problem but it did not. . Adjustable Fuel Regulation From 1 To 4 PSI .220 Inch 7/32 Inch Restriction. Now, Holley EFI is dominating the performance world as well as our products for GM's LS engine. . So with that vapor fueling system - you are stuck "downgrading it" to a lower quality fuel. Bobburns thank you for the confirmation and technical explanation. The issue is simple that one is seeking to "re-blend" their own gasoline from one already sold. Check the status of your I've had some luck using LeadMax2000 but it's not a 100% cure. All Holley regulators are pre-set at the factory so there is no guesswork when first installing the regulator. Too much fuel pressure for a given needle and seat assembly can overload the needle and seat and may cause flooding or drivability problems. There is supposed to a marking on the spring with the correct color, red or gold if it is the low pressure spring. There is no "chemistry set" method to measure fuel vapor points. 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. 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. 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. 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 Holley 12-804 is a 1 to 4 range PSI regulator. THESE INSTRUCTIONS MUST BE READ AND FULLY UNDERSTOOD BEFORE BEGINNING THE . 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. Shop Fuel Pressure Regulators at Summit Racing. There are two kinds and they look the same. ***The inlet pressure limitation is 7 psi. The 12-803 BP is a By-Pass design of the same style. Average for the last 12 months. By 1913 it was the other way around. Pre-set at 2.8 PSI Quick & Hassle Free. That was in the 1990s, so you can project to more current times and suspect we have something more sophisticated now. This part is legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles. 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. Takes a little time to peel back the rubber case then remove the glass with a fine blade screwdriver, reset to zero. Yes the light elements will still be in there. The higher the RVP, the greater the tendency to vaporize or vapor lock. Brands like MSD, Flowmaster, Hurst, Accel and many more make up the offering of enthusiast-driven products to deliver robust, complete performance solutions for builders, racers, and drivers. If youre looking to dial it in accurately its not going to do it. There was a problem completing your request. I would welcome your advice on this - with apologies for the length of this post. The Holley 12-804 fuel pressure regulator features 3/8" NPT in/out ports. The lower I can get with this pressure is 3.5 psi (at max adjustment). 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. Too much fuel pressure for a given needle and seat assembly can overload the needle and seat and may cause flooding or drivability problems. Could you explain a little more about how you would run the bypass? Privacy Policy. It works but not as well as some of the off brands like spectre. I remember when I was a teen in the 50's and everyone had a flathead Ford V8 or a Chevy stovebolt 6. Find an Automotive Service Professional 9517377223. You may receive a partial or no refund on used, damaged or materially different returns. Reviewed in the United States on June 20, 2021. At first it seemed fine, set it to 1.5 PSI and away we go. This item can be returned in its original condition for a full refund or replacement within 30 days of receipt. It's unlikely that anything's stuck. I prefer to keep things simple but I appreciate the more correct technical approach. 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. I had a chrome dial regulator, which leaked gas everywhere but luckily didn't actually burn down my ride. You need to be a member in order to leave a comment. Full content visible, double tap to read brief content. Applications. As a single solution, or partnered with products from other Holley companies - Hooker Headers(R), Flowtech(R) Exhaust, NOS(R) Nitrous, Weiand(R), Earl's Performance Plumbing(R), or Diablosport(R)- Holley products can give you the edge you need over the competition. Free shipping for many products! 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. All Holley regulators are pre-set at the factory at 2.8 PSI so there is no guesswork when first installing the regulator. That's not to say that adding something like kersene won't help, but it can't eliminate the volatile components. The 12-804 is made from durable aluminum and has a satin chrome finish that is extremely resilient to corrosion and abrasive chemicals. There was a problem adding this item to Cart. This Holley universal low pressurefuel regulator is factory-setto 2.7 PSI, but is fully adjustablefrom 1 to 4 PSI. Remember STILL transporting fuels was a dangerous thing - and higher grade fuel could just as easily have exploded on it's way to the fueling station or in those glass top hand operated early gas pumps on a hot day. Holley 12-804 1-4 Psi Carbureted Two Port Fuel Pressure Regulator: Item #: HLY12-804 : Quantity: Price: $53.99 Add to cart . Any of these heavier than gasoline petroleum distillates above will raise the vapor point of gasoline if mixed into it. Shipping cost, delivery date, and order total (including tax) shown at checkout. Discussion in 'The Hokey Ass Message Board' started by striper, Aug 12, 2009. You set it to the exact fuel pressure you want. The unit however is working fine but am curious about the missing gaskets and how important they are? 3/8Inch Npt Ports 1 Inch 2 Out. I turned into a side street and opened the hood. Reviewed in the United States on September 4, 2017. Please use a different way to share. In the early days of the oil business the demand was for kerosene or coal oil. Please choose a different delivery location. Show details For more information go to www.P65Warnings.ca.gov. Might have been along the same lines as adding a quart of atf to the engine oil to help quiet noisy hydraulic valve lifters, or for "sludge clean-up" activities? Somewhat of an inconvenience but that's why it's probably cheaper than other places selling the same part 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. 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. Each Holley fuel pressure regulator is fully adjustable so regulating the fuel pressure to your engines needs is a simple task. Check "Reid Vapor Pressure" in Wikipedia, or similar. This product is made of high-quality materials to serve you for years to come.
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