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. I'm suggesting to raise the boiling point by adding heavier or oilier substances such as kerosene. It's a diaphram with a spring. So this thread has been a great find for me particularly at this time. For more information go to www.P65Warnings.ca.gov, WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov, WARNING: This product can expose you to chemicals including 1,1,1,2-Tetrachloroethane which is known to the State of California to cause cancer. I feel lucky that this did not damage my generator because at one point I saw 30lbs of pressure while trying to start the generator. Full content visible, double tap to read brief content. There is no "chemistry set" method to measure fuel vapor points. 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. 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. 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. Each Holley fuel pressure regulator is fully adjustable so regulating the fuel pressure to your engines needs is a simple task. I have the one I have set up in a deadhead setup. 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. Amazon has encountered an error. I'm still looking for the reg in this pic. 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 . Each Holley fuel pressure regulator is fully adjustable so regulating the fuel pressure to your engines needs is a simple task. Yes the light elements will still be in there. 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. 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. Great feedback from a knowledgeable group, guys! Applications. 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. Then I got this good one, to try to get 1.5 PSI to the Kadrons. Open the unit and check the spring color, Reviewed in the United States on April 9, 2018. the installation of a Holley 12-810 oil pressure safety switch is recommended for installation into the wiring circuit. Quick & Hassle Free. Includes initial monthly payment and selected options. (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). Just open the hood and let things cool. 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.". Average for the last 12 months. The issue is boiling points UNDER PRESSURE we are talking about here - though the BP article speaks to other issues of engine and carburetor design contributing to the vapor lock problem. He asked about issues and thoughts of what causes vapor lock, so it is just answered in more detail and suggested solutions on how to fix vapor lock. CBPN804A Swinging Drawbar Pin Kit Ford NAA 501 600 700 800 900 2000 3000 4000. 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. Second, you adjust this regulator by turning the hex screw on top - does anyone happen to know how many pounds one or more full turns would produce etc? The first opportunity to try it occurred recently. 1996-2023, Amazon.com, Inc. or its affiliates, Select a location to see product availability, Holley HOL 12-804 12-804 Fuel Pressure Regulator. Free shipping for many products! . Regards, Mike. Please try again later. There was a problem adding this item to Cart. 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. This satin finish regulator feature 3/8 pipe thread . 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. There's always a catch with bargains, Reviewed in the United States on July 9, 2022. That is why fuel injection systems push usually 45 to 60 psi on the fuel at all times with a by-pass line - to keep it liquid and keep it moving - so it cannot turn to vapor in the lines. [endif]-->. Copyright 2023, Antique Automobile Club of America. Yes you can adjust fuel pressure with this regulator. . 3/8 pipe thread ports; 7/32 restriction; . 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. Please choose a different delivery location. Had to reset to Zero. There is clearance around the needle which I would have thought would be enough to vent the increased pressure but maybe not. 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. I had a chrome dial regulator, which leaked gas everywhere but luckily didn't actually burn down my ride. If you have it plumbed up "dead headed", lowering the pressure might not react very quickly. 03-28-2012, 03:04 AM. You set it to the exact fuel pressure you want. I have a holley low pressure reg. ${cardName} not available for the seller you chose. Designed using state-of-the-art technology and with customers in mind. 3/8Inch Npt Ports 1 Inch 2 Out. Usually, just runs really lean for a couple of minutes, and will not go above idle until fresh fuel finally clears through. Mounting Bracket Included. I will be fitting a pressure regulator, it can only help and will have to wait for the next vapor lock to occur to see if it overcomes the flooding. It will meet your needs and deliver great quality at an affordable cost. 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. Holley Manufacturer Part Number 12-804 Manufacturer Holley Assembled Product Dimensions (L x W x H) 3.50 x 3.50 x 2.50 Inches Warranty Warranty information 90 DAY REPLACEMENT IF DEFECTIVE Warnings Warning Text proposition 65 reasons:titanium dioxide, other chemicals WARNING - California Proposition 65 None Report incorrect product information We are sorry. OD says the Boiling point of gasoline cannot be raised by adding a heavier hydrocarbon - such as kerosene or diesel - and points to a high school chemistry class experiment as his proof. This item can be returned in its original condition for a full refund or replacement within 30 days of receipt. Find an Automotive Service Professional The regulator that was shipped to me has an internal spring from a different model of regulator, the spring should be red. fuel pressure in at the top, fuel pressure out on each side. I look upon that effort with a heavy heart though, for I have been religious about keeping the old car original as possible. Use with standard pump only -not recommended for maximum pressure pumps. 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. the fuel pressure gage needs to be in the line going to carbs. 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. The other possibility is that it is due to the higher pump pressure. 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. 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. Any thoughts on this? Easier said than done - especially without a "chemistry set", OD says a simple high school chemistry experiment will show this - BUT I said the boiling points will appear the same under STP (Standard Temperature and Pressure - which is one atmosphere of pressure at 77 degrees F - commonly room temperature ) - BUT under pressure in a fuel line the boiling point (vapor point) will be raised enough to prevent vapor lock at higher temperatures. To see our price, add these items to your cart. Please try again later. ). Does it come with the hose fittings or to be bought separately? These will raise the boiling point of the fuel but reduce the octane. 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. I still think they sent you the high pressure one. Steve_Mack_CT 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. I have adjusted a 6-9 lbs pump down. Spring clothes pins, aluminium foil, wet burlap, etc. The engine was running. This part is Backordered. . It was not. . A vapor lock condition would be caused. This approach is not recommended for higher compression cars made from the mid fifties onwards. September 21, 2010 in Technical. Reviewed in the United States on June 5, 2022. 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. 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. To ensure this condition, the installation of a Holley 12-810 oil pressure safety switch is recommended Does this need to be mounted upright or is it ok on its side? The '54 Bentley already has an electric SU pump back near the tank, and it's low pressure output is just about right for the two SU H6 type carbs. #2. 1 oz per gallon - not more than 2 is usually in the right "goldie-locks" range. I installed this on my Onan 7000 generator as part of a project to resolve vapor lock issues in hot weather and high altitudes. The Holley 12-804 fuel pressure regulator features 3/8" NPT in/out ports. P/N 12-803, 12-501, 12-804, 12-500, & 15812NOS Installation Instructions WARNING! So if you're looking for a FPR to get 1-4 psi, then the 12-804 is no longer your best choice. Could you explain a little more about how you would run the bypass? That's not to say that adding something like kersene won't help, but it can't eliminate the volatile components. Octane is an actual chemical which would be at the light end of the scale for gas, kerosene would be at the heavy end. Gauge looks small..it is not. So in an open cup the boiling points would also appear the same as water but under pressure the boiling point is different. You would'nt just be reading the inlet pressure would you? Gasoline at the pump is a blend of different chemicals. The unit however is working fine but am curious about the missing gaskets and how important they are? Some of these items ship sooner than the others. I have found IMCT is a happy medium that does both in the right quantities - raise boiling point and octane just enough to be a "goldie-locks" kind of additive to help prevent vapor lock. Yes. Too much fuel pressure for a given needle and seat . Generally speaking if your car was made before 1953 it has low compression. Thus the "lowest boiling point are the cause of vapour lock" is also NOT CORRECT thinking. Did not like having to reset to zerobut I did. I cannot help you - and no one can without knowing the exact make up of the gasoline being refined where you are. That's where the pressure was going. You may receive a partial or no refund on used, damaged or materially different returns. 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. (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. 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. 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. This will ensure that the pump will not continue to operate after the engine is . [endif]--> Many thanks for taking the time to clarify this interesting subject . As an example water would boil and thus "vapor lock" at a really low temperature without ethylene glycol. I suspect as the article suggests even with all these steps you can still get the crap gas to boil if it is hot enough under the hood. 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). CALIFORNIA WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov. Auto Parts v 6c02f45cd (2fvgn) cv1440. I have used kerosene to avoid vapor lock and there is no doubt it helps, the more the better up to 20% in a low compression 1920's car. 12-804 12-500 Low-Pressure Fuel Regulator (std. We work hard to protect your security and privacy. This item cannot be shipped to your selected delivery location. From start to finish, Holley has the parts to make your dream a reality.