THE SECOND ISSUE - the vapor system on the Packard is going to be a problem no matter what today. 9517377223. . There is clearance around the needle which I would have thought would be enough to vent the increased pressure but maybe not. 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. So the goal is to raise the vapor point temperature without lowering the auto-ignition temperature or flash point or flame spread speed - or increasing the flame spread speed too much. 3/8 Inch NPT Ports 1 Inch 2 Out. 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 any further assistance please feel free to call us at: 1-877-238-2623 or visit the nearest Advance Auto store and one of our representatives will gladly assist you with any questions or concerns you may have. Usually, just runs really lean for a couple of minutes, and will not go above idle until fresh fuel finally clears through. I can start my car instantly after sitting in a cool garage at about 75 deg F. Drive 30 miles and then park for 20 minutes. 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. Holley 12-804 low pressure regulator, Weber, jeep etc. The pressure regulator works fine when mounted flat, but should work ok when mounted on it. Purchased the regulator from Baxter, unit arrived in 4 days.. I had a chrome dial regulator, which leaked gas everywhere but luckily didn't actually burn down my ride. 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. Gasoline at the pump is a blend of different chemicals. Lots of Chinese Holley 12-803, 804 etc knock-offs are available. Features: Adjustable fuel regulation from 1 to 4 psi .220" (7/32") restriction 3/8" NPT ports ( 1 in, 2 out) Chrome finish Mounting bracket included Pre-set at 2.8 PSI About Holley 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. Everything does just fine, until temperatures rise above 80 degrees or so, as they are soon to do. The 12-803 BP is a By-Pass design of the same style. I like the attached simple explanation of the issue. You set it to the exact fuel pressure you want. Adjusting Holley & Demon Mixture Screws; Holley Specs HP Series; Edelbrock Carburetor Specs; Holley Double Pumper 4150 Specs; Carter Competition Series AFB Specs; Company Info. The float has a needle that projects through the top of the carburettor so it is possible to see whether the float is "floating" or not. No mention of vapor lock issues, but engine de-carbon activities. The reliable, albiet slower, stovebolts never suffered vapor lock because the fuel pump and lines were up front in the airstream of the engine fan. That work continues today through Holleys EFI products as well as through Holleys family of brands. Depending on what kind of electric fuel pump you used you will need a regulator - or series of regulators to step down the pressure getting to the carburetor like a Holley 12-803 type at the very least. You'll find they both have the same initial boiling point - been there and done it. So - you cannot just say whether it will work or not. From that time on octane ratings slowly rose, helped by the addition of more and more tetraethyl lead. . This item can be returned in its original condition for a full refund or replacement within 30 days of receipt. For cars that require 4.5 to 9 PSI, the Holley 12-803 is the right model. . The engine was running. 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. 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. However I would welcome you advice on the following. The reg takes 3/8" fittings and the gauge takes 1/8" fittings. Will changing the orientation change the preset pressure setting (checkball falling instead of raising)? I cannot help you - and no one can without knowing the exact make up of the gasoline being refined where you are. May God's grace bless you in the Lord Jesus Christ. Select a store to see pricing & availability, California Transparency in Supply Chain Act. Too much fuel pressure for a given needle and seat assembly can overload the needle and seat and may cause flooding or drivability problems. It feeds fuel directly from the tank to the carburettor. Contact Us - DO NOT EMAIL CAR QUESTIONS. This diaphragm repair kit is for 12-803 and 12-804 regulators. 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? Recommended Parts. Inlet from fuel pump is at bottom. This item: Holley HOL 12-886 Regulator $13129 MEASUREMAN 1-1/2" Dial Size, 304 Stainless Steel case, Liquid Filled Fuel Pressure Gauge, 0-100Psi, 3-2-3%, 1/8"NPT Center Back Mount $2597 Moroso 65380 Fuel Line Fitting $1701 Total price: $174.27 Add all three to Cart Some of these items ship sooner than the others. Too much anti-freeze - (typically ethylene glycol) causes the opposite effect even under pressure of the cooling system. A quart of diesel added to the gas tank solves the problem without any more in side effects than a slight smell from the exhaust. and a rotary click style one here on the shelf pete, you are welcome to borrow them to troubleshoot your problem.. let me Know. Stay up to date with the latest releases, events, promotions and more. 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 Installation was made more complicated by the absence of a port for a pressure gauge, which means 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 . Holley HOL 12-804 12-804 Fuel Pressure Regulator. I have heard true lead (LeadMax2000 or simillar) may do this as well? It is not all the same. Please try again later. 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. If I wait a hour for the system to cool to ambient temperature then it starts easy. You need to be a member in order to leave a comment. I have adjusted a 6-9 lbs pump down. 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. Joined: Apr 7, 2008 Posts: 1,727. 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. Yes the light elements will still be in there. 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. To see our price, add these items to your cart. Tags: None TheSilverBuick ALMOST Spidey ! 03-28-2012, 03:04 AM. It is as said - of the "paint thinner" family in weight with ehtyl acetate blended in to make it's solvency properties a little "hotter " and stronger. 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. The regulator that was shipped to me has an internal spring from a different model of regulator, the spring should be red. Never tried it with my old Model A Ford but I heard that they will actually run on Kerosene.. I've had some luck using LeadMax2000 but it's not a 100% cure. I got all of my supplies in the Home Depot fittings section. CALIFORNIA WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov. Gauge looks small..it is not. [endif]-->. Octane is an actual chemical which would be at the light end of the scale for gas, kerosene would be at the heavy end. 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. There is no "chemistry set" method to measure fuel vapor points. Reviewed in the United States on June 5, 2022. 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. Find many great new & used options and get the best deals for Holley 26-137 Adjustable Secondary Idle Lever at the best online prices at eBay! So if you're looking for a FPR to get 1-4 psi, then the 12-804 is no longer your best choice. 1 oz per gallon - not more than 2 is usually in the right "goldie-locks" range. do you have a picture of it hooked up? IMCT is found in the paint isle of any hardware or home improvement store usually in quart or gallon cans. 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. Part Number: HLY-12-803. I remember when I was a teen in the 50's and everyone had a flathead Ford V8 or a Chevy stovebolt 6. 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. Too much fuel pressure for a given needle and seat assembly can overload the needle and seat and may cause flooding or drivability problems. At first it seemed fine, set it to 1.5 PSI and away we go. Many thanks for taking the time to clarify this interesting subject . 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. By 1913 it was the other way around. Show details In the early days of the oil business the demand was for kerosene or coal oil. Two 3/8" nipples/hose connections and a 3/8" to 1/8" reducer. 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. It makes no discernible difference to power but if the conditions are sufficiently adverse it will still vapour lock and then you just have to wait until it cools. 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). That's not to say that adding something like kersene won't help, but it can't eliminate the volatile components. The other part numbers utilize an AN O-ring inlet, outlet, & return ports, and do not require any sealer on the threads. All petroleum distillates have different chemical properties which change depending on what you mix them with. Walk back over and looked again, 9lbs. Holley 12-804 Holley Fuel Pressure Regulators JEGS 41040 JEGS Fuel Pressure Gauges Now you need fittings. As Raywith pointed out, you need to let the pressure go somewhere. It's unlikely that anything's stuck. If you put in too much you can return the fuel to some "kick" without knock with a small amount of acetone. 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. The term heavy ends may be old fashioned and obsolete. No issues. Just open the hood and let things cool. Holley 12-804 Fuel Pressure Regulator Installation Instructions . Overview. 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. For over a century Holley has driven the cutting edge of fuel-system design. We encountered an error while updating this page. FREE SHIPPING on most orders of $35+ & FREE PICKUP IN STORE. The Holley 12-804 fuel pressure regulator features 3/8" NPT in/out ports. Vapor lock was just a fact of life for the Fords. If you purchased April gas when you take your Antique out of winter storage it is only a month until the switch from 124 deg F to 140 deg F. This might explain a lot of problems in early summer. This satin finish regulator feature 3/8 pipe thread . Powered by Invision Community, http://www.bp.com/liveassets/bp_internet/retail/retail_australia/STAGING/local_assets/downloads_pdfs/f/FN_modern_petro_vintage_engines.pdf. 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). Refineries have been doing this for decades. MFG. Gasoline was so light if you left the cap off a gallon can it would all evaporate in a few days. 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 . Adjustable fuel regulation from 1 to 4 psi, 1965 and older U.S. manufactured California Certified vehicles, 1967 and older U.S. manufactured Federally Certified vehicles, 1967 and older Foreign manufactured vehicle, 1966 and newer U.S. manufactured California Certified vehicles, 1968 and newer U.S. manufactured Federally Certified vehicles, 1968 and newer Foreign manufactured vehicle. How much should I add to every gallon of gas.I believe they are adding about 5% ethanol to the fuel here. Cool. Open the unit and check the spring color, Reviewed in the United States on April 9, 2018. Enhancements you chose aren't available for this seller. Applications. 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. Privacy Policy. Once the fuel fills up the float bowls in the carburetor and the needles and seats shut, it starts to build pressure, pushing the diaphragm against the adjustment spring under the adjustment screw and allowing the ball to go "up" against the seat, effectively shutting off fuel flow to the carb. 10 in stock. [endif]-->,