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Joined: Apr 7, 2008 Posts: 1,727. Each Holley fuel pressure regulator is fully adjustable so regulating the fuel pressure to your engines needs is a simple task. We tend to speak of pressure as higher or lower than atmospheric however it is a relative measure and pressure applies under all conditions. Wouldn't the water still evaporate at the same temp? Everything does just fine, until temperatures rise above 80 degrees or so, as they are soon to do. HWYoF~Ta77[Z4"bG K=yK Just open the hood and let things cool. I look upon that effort with a heavy heart though, for I have been religious about keeping the old car original as possible. Is it a product that would be sold by a panel beater's supply shop? Does it come with the hose fittings or to be bought separately? WARNING! Talk to the experts. There is no hard and fast cutoff for any of these. The Holley 12-840 fuel pressure regulator features 3/8" NPT in/out ports. 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. NOTE: P/Ns 12-841, 12-842, & 12-879 utilize 3/8" NPT inlets and outlets. THE SECOND ISSUE - the vapor system on the Packard is going to be a problem no matter what today. I still think they sent you the high pressure one. Features: Adjustable from 4.5-9 psi for precise fuel pressure adjustments Constructed of billet aluminum with a black anodized base and clear anodize top for good looks Used in systems where a return line is not needed Use with electric or mechanical pumps On the Holley 12-804 fuel pressure regulator, the factory preset is supposed to be 2.8 pounds - can anyone say is Holley usually pretty accurate on these presets? ***The inlet pressure limitation is 7 psi. Never tried it with my old Model A Ford but I heard that they will actually run on Kerosene.. Enhancements you chose aren't available for this seller. The lower I can get with this pressure is 3.5 psi (at max adjustment). 4.25 out of 5 stars. Boy am I glad to have happened on this thread. Walk back over and looked again, 9lbs. Browse In Stock and Ready to Ship Alternatives, Universal Fit, 1-4 Fuel Pressure Rating (psi), Aluminum. . If you put in too much you can return the fuel to some "kick" without knock with a small amount of acetone. Got a gauge on the FPR to monitor, and at first it was great. Mounting Bracket Included. Lower octane will not hurt your car if the compression is low. (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. 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. I do wish there were some stamped values on the adjustment screw like other models I have seen. What Rusty writes IS correct. The seller gratefully sent me a replacement part but the result was the same. But, . We dont share your credit card details with third-party sellers, and we dont sell your information to others. I appreciate it. Hi Bob, I can get a hold of some 99.7% pure ethyl acetate cheap. use a 1/16 - 1/8" restrictor in the end of your fuel line to see if you can set the pressure then. We will have the previous answer corrected. 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. By 1913 it was the other way around. I appreciate it!! . I'm suggesting to raise the boiling point by adding heavier or oilier substances such as kerosene. Check the status of your Usually, just runs really lean for a couple of minutes, and will not go above idle until fresh fuel finally clears through. This satin finish regulator feature 3/8 pipe thread . 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. This experience ties with that the owner of a very early Twin Six Packard. Loosening the regulator locknut and turning the adjustment screw clockwise increases the pressure. couple more questions, Rusty, what exactly are "heavy ends"? 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. Regards, Mike. The unit however is working fine but am curious about the missing gaskets and how important they are? Add some heavy ends. #2. $59.69 . Wont be good for a finicky carb. 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. A larger tank might need two quarts. Worked well out of the box. I have just this Spring started taking temp. It's easy! Purchased the regulator from Baxter, unit arrived in 4 days.. 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 It feeds fuel directly from the tank to the carburettor. Some have reported more power, easier starting and cooler running especially in very low compression cars of the twenties and early 30s. If I wait a hour for the system to cool to ambient temperature then it starts easy. The summer gasoline vaporizes in the line and the heat soak is quicker and longer on hot day's. Some of these items ship sooner than the others. At first it seemed fine, set it to 1.5 PSI and away we go. 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. The BP article does not address how to re-blend your own fuel, and indeed - each batch of gasoline - and even how long it has been sitting in a tank will change it's properties as certain things evaporate out of the fuel changing it's properties if in a vented tank. . It appears this one needs 40 to 50 minimum. I would welcome your advice on this - with apologies for the length of this post. As an example water would boil and thus "vapor lock" at a really low temperature without ethylene glycol. There is no "chemistry set" method to measure fuel vapor points. Adjustable from 1 to 4 PSI. the cause for your fuel pressure fluxuation is because the fuel pressure is bumping up against the regulator and the extra fuel has no where to go , the quick fix is run a return line . May God's grace bless you in the Lord Jesus Christ. Copyright 2023, Antique Automobile Club of America. 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. Call 800.979.0122, 7am-10pm, everyday. 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. Part #: 12-807. . None of them worked. I would like to try IMCT, how is it sold? LOW PRESSURE REGULATOR 12-804 quantity. Will buy again if I need another one for a different project. Please choose a different delivery location. Adjusting Holley & Demon Mixture Screws; Holley Specs HP Series; Edelbrock Carburetor Specs; Holley Double Pumper 4150 Specs; Carter Competition Series AFB Specs; Company Info. Learn more about our It is a measure, as I understand it, of how readily the fuel will evaporate in open air. Needs you to make/tap your own threads for screws, Reviewed in the United States on February 4, 2023. Any thoughts on this? Chrome Finish. Mr. Gasket 1561 Fuel Pressure Gauge 1.500 in. Installation was made more complicated by the absence of a port for a pressure gauge, which means Accurate description. For more information go to www.P65Warnings.ca.gov. Street/Strip Carbureted Applications Yes. The regulator that was shipped to me has an internal spring from a different model of regulator, the spring should be red. Holley recommends applying PTFE paste to the NPT thread of the fittings before installation on these applications. 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. 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. ESPECIALLY a 10% ethanol blend - once generically called the gasohol summer blend in that vapor system would really be a problem. I found this document on my local Oil Refinery's web site and it may help explain some of the problems with vapor lock and hard start. [{"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"}]. Driving on a warm day in heavy stop start traffic it started vapor locking on a climb - using 10% ethanol fuel with no additive . This is the complex world of Chemistry - which is far too complex to go into here. In the later 1960s, it was somewhat common for people who were going on vacation, in the summer, to add a gallon or two of diesel to a full tank of gasoline for their trip. Full content visible, double tap to read brief content. The BP article explains causes - not how to change fuel formulations - so for this discussion it explains nothing. $12.15: ac000400: Front Axle Beam Bushing Reamer For 1.34 Up To 1.50 Diameter . I adjust it up to 2.5 pounds and clean my hands. 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. Works and does the job. Our payment security system encrypts your information during transmission. TURNING THE ADJUSTMENT SCREW ALL THE WAY IN WILL RESULT IN EXCESSIVE FUEL PRESSURE . 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. Holley fuel pressure regulators are designed to precisely control the fuel pressure from the fuel pump to the carburetor. Adding some additives can raise the AVERGE boiling point but cannot remove the lower-boiling components, so regardless of what higher ends are present, the initial boiling point will remain that of the most volatile components. ***The inlet pressure limitation is 7 psi. From propelling the LS-, Coyote-, and Gen 3 Hemi-swap trends, to continuously innovating late-model and vintage vehicle performance, Holleys commitment to its customers and their cars is at the core of everything we do. 12-804) is a Low Pressure (1-4 PSI) regulator. 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. If you have it plumbed up "dead headed", lowering the pressure might not react very quickly. Too much fuel pressure for a given needle and seat assembly can overload the needle and seat and may cause flooding or drivability problems. Holley Performance Products has been the undisputed leader in fuel systems for over 100 years. 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. By There's always a catch with bargains, Reviewed in the United States on July 9, 2022. 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. 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 . I remember when I was a teen in the 50's and everyone had a flathead Ford V8 or a Chevy stovebolt 6. They sold more gas than coal oil. This part is Backordered. P/N 12-803, 12-803BP, & 12-804 Installation Instructions 199R7914-3 NOTE: 12-803BP IS NOT TO BE USED WITH MECHANICAL FUEL PUMPS! [endif]-->,