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. [endif]--> Many thanks for taking the time to clarify this interesting subject . . Lower octane will not hurt your car if the compression is low. Holley 12-804 1-4 Psi Carbureted Two Port Fuel Pressure Regulator: Item #: HLY12-804 : Quantity: Price: $53.99 Add to cart . P/N 12-803, 12-803BP, & 12-804 Installation Instructions 199R7914-3 NOTE: 12-803BP IS NOT TO BE USED WITH MECHANICAL FUEL PUMPS! I had a chrome dial regulator, which leaked gas everywhere but luckily didn't actually burn down my ride. So - you cannot just say whether it will work or not. Holley(R) has been the undisputed leader in fuel systems for over 100 years. 2-Port Carbureted Fuel Pressure Regulator (12-804) by Holley. 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. 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. Going to check my VW bus fuel pump pressure. It is a measure, as I understand it, of how readily the fuel will evaporate in open air. All petroleum distillates have different chemical properties which change depending on what you mix them with. ***The inlet pressure limitation is 7 psi. I have heard true lead (LeadMax2000 or simillar) may do this as well? 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. the fuel pressure gage needs to be in the line going to carbs. Octane is an actual chemical which would be at the light end of the scale for gas, kerosene would be at the heavy end. MFG. The regulator that was shipped to me has an internal spring from a different model of regulator, the spring should be red. This Holley universal low pressure fuel regulator is factory-set to 2.7 PSI, but is fully adjustable from 1 to 4 PSI. 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 Holley 12-804 is a 1 to 4 range PSI regulator. Your question might be answered by sellers, manufacturers, or customers who bought this product. 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. This went on until they developed the cracking process which allowed more flexibility in what they got out of the crude. 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. I have a holley low pressure reg. finish) . Please make sure that you are posting in the form of a question. The carburettor was flooding, the electric pump was still running. (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. 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 have just this Spring started taking temp. 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.". (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 . Turn the screw out to lower the pressure. It will meet your needs and deliver great quality at an affordable cost. Mounting Bracket Included. The only difference that the Holley tech told me between the two springs is the color. Discussion in 'The Hokey Ass Message Board' started by striper, Aug 12, 2009. Prewar cars have very low compression and will run better on gas that has some kerosene added. 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. Then I got this good one, to try to get 1.5 PSI to the Kadrons. Installation was made more complicated by the absence of a port for a pressure gauge, which means 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. #1 Holley 12-803 Fuel Pressure Regulator January 16, 2011, 11:41 AM Can it be mounted upside down (adjustment screw pointing down) and still work properly? It feeds fuel directly from the tank to the carburettor. Regards, Mike. Thanks to all contributors, particularly the information from Rusty, Bob and David. 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. 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. Cool. 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. Changing the vapor pressure (and thus the boiling point) of gasoline is not new. Joined: Apr 7, 2008 Posts: 1,727. The other possibility is that it is due to the higher pump pressure. Applications. 4.9. Holley Carburetor Fuel Pressure Regulator 1 To 4 Psi Bottom Inlet Sides Are Outlets from Pacific Customs Unlimited your best source for Street, Off Road, Sandrail, Dune Buggy, Manx, Rock Crawler, Volksrod, or Mud Buggy VW Parts. 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. 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. 9 really is max. Unfortunately, this fuel pressure regulator does not even come close to regulating the pressure and keeping the pressure down. Yes. Please try again later. Free shipping for many products! Starting in 1970 leaded gas was taken off the market resulting in the gas we have today. 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. Daily newspaper from Sapulpa, Oklahoma that includes local, state, and national news along with advertising. 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. Use with standard pump only -not recommended for maximum pressure pumps. All Holley regulators are pre-set at the factory at 2.8 PSI so there is no guesswork when first installing the regulator. I turned into a side street and opened the hood. Accurate description. 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. 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. But it is not the ethyl acetate alone that causes the effect to raise the vapor temperature point of fuel. It IS variable and a result of the various fuel blend components. So if you're looking for a FPR to get 1-4 psi, then the 12-804 is no longer your best choice. It needed a bit of adjusting for my purpose, but other than that, it performed perfectly. This item cannot be shipped to your selected delivery location. I had a chrome dial regulator, which leaked gas everywhere but luckily didn't actually burn down my ride. The chemistry class experiment you are referring to will yield the approximate boiling (vapor) point at STP - Standard Temperature and Pressure ONLY. Two 3/8" nipples/hose connections and a 3/8" to 1/8" reducer. 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. Will buy again if I need another one for a different project. THESE INSTRUCTIONS MUST BE READ AND FULLY UNDERSTOOD BEFORE BEGINNING THE . neglect, accident, improper installation or adjustment, dirt or other contaminants, water, corrosion or faulty repair, or used in applications other than . . Steve, gasoline isn't a single chemical compound but a mixture of hundreds of individual chemical compounds which have a large range of boiling points. Never had it act up while running, but since E10 fuel came along it is borderline getting started after hot shutdowns. 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. 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. 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. Did not like having to reset to zerobut I did. Purchased the regulator from Baxter, unit arrived in 4 days.. Google ethyl acetate and pay attention to it's "pure" boiling point, and remember IMCT is a blend of a white gas family of a petroleum distillate and ethyl acetate. A long time ago it was in use in the oil business. 2023 Holley Performance Products, Inc. All Rights Reserved. IMCT is found in the paint isle of any hardware or home improvement store usually in quart or gallon cans. Please use a different way to share. Now my equipment sits idle while I wait for a response from the vendor. Holley Fuel Pressure Regulators 12-803 HLY-12-803. 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. You set it to the exact fuel pressure you want. They sold more gas than coal oil. $59.69 . Shopping Cart For over a century Holley has driven the cutting edge of fuel-system design. 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? 0 12-804 12-500 Low-Pressure Fuel Regulator (std. Is there a brand name? 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. I remember when I was a teen in the 50's and everyone had a flathead Ford V8 or a Chevy stovebolt 6. 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). At first it seemed fine, set it to 1.5 PSI and away we go. The Holley 12-804 fuel pressure regulator features 3/8" NPT in/out ports. 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. 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. 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. 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. Part Number: HLY-12-803. [endif]--> http://www.bp.com/liveassets/bp_internet/retail/retail_australia/STAGING/local_assets/downloads_pdfs/f/FN_modern_petro_vintage_engines.pdf,