Fuel pump regulator has 3/8" NPT inlet/outlet ports. 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. Holley 804 fuel pressure regulator install - YouTube The Holley 12-804 fuel pressure regulator features 3/8" NPT in/out ports. But the heavier elements will raise the boiling point of the mixture. "Pure" Ethyl Acetate could be called an "alcohol" as Ethyl acetate is the ester of ethanol and acetic acid; and it is manufactured on a large scale for use as a solvent. Quadrajets should have 6 to 9 at the inlet or they flood past the needle seats. The point being here - you need enough steady high enough pressure on the ball to allow it to regulate down reliably too. Can anyone speak to the validity of this or is anyone currently using an additive for this? Part #: 12-807. . Each Holley fuel pressure regulator is fully adjustable so regulating the fuel pressure to your engines needs is a simple task. Everything does just fine, until temperatures rise above 80 degrees or so, as they are soon to do. Open the unit and check the spring color, Reviewed in the United States on April 9, 2018. For the best experience please upgrade or visit the site on another browser. With this set up, pressures throughout system varies only very slightly from atmospheric, lower up to the vacuum tank and higher in the gravity feed from the vacuum tank to the carburettor. Typically there are "winter" and "summer" blends with different vapor pressures to promote atomization at cold temps and to discourage vapor lock at hot temps. 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. near you Can Boiling Point of Gas Be Raised? - Discussion Forums the fuel pressure gage needs to be in the line going to carbs. This went on until they developed the cracking process which allowed more flexibility in what they got out of the crude. $12.15: ac000400: Front Axle Beam Bushing Reamer For 1.34 Up To 1.50 Diameter . . It does however produce an irritating fume that irritates the eyes and mucous membranes when burning in gasoline. Today's fuel is made for high compression engines - and it has an intentionally lower vapor point, with a higher flash point and autoignition point. I prefer to keep things simple but I appreciate the more correct technical approach. HOLLEY pressure reg. PROBLEMS | The H.A.M.B. Holley 12-804 1-4 Psi Carbureted Two Port Fuel Pressure Regulator TURNING THE ADJUSTMENT SCREW ALL THE WAY IN WILL RESULT IN EXCESSIVE FUEL PRESSURE . Purchased the regulator from Baxter, unit arrived in 4 days.. The two will be very close to the same just as would Water and Anti-Freeze boiled in an open pot. ;b DK%*DO[%A IPd?Q~]=n1)E1D*q`D fF-"4N3i4\1uOn(@%c0IHQg`~uKVf{/r0d2}XVXi1-tpE1K[T*3"IS0v27UfTajff`"(dJD0fFlvryT{?:VUusSqD?R$LlalK&@$8q'qbSEv Reviewed in the United States on September 4, 2017. If yes what size should I, 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. P/N 12-803, 12-501, 12-804, 12-500, & 15812NOS Installation Instructions WARNING! If I could get 75-85 octane, non-ethanol, Regular gasoline that vaporized at above 180 deg F, I think my car would run fine all the time. 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. ${cardName} unavailable for quantities greater than ${maxQuantity}. Click here to find a 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. fuel pressure problem - holley blue pump & reg | Hot Rod Forum Fuel Pressure Regulator Holley 12-804 for sale online | eBay Copyright 2023, Antique Automobile Club of America. The lower I can get with this pressure is 3.5 psi (at max adjustment). Refining of oil is basically heating it into vapors and then capturing those vapors various degrees of cooling - at the top is "propane" - at the bottom is "pitch" or "road or roof tar". Holley 12-807 Fuel Pressure Regulator Diaphragm Repair Kit made by Holley, for as low as $9.21. What one is after is new "liquid" fuel which vaporizes easily in open air, lights easily and has a rapid flame spread but NOT a hot explosive one, and burns easily and completely under one atmosphere of pressure - what we call 14.7 to 1 - BUT - and this is most important; does not auto-ignite at a low temperature and WAITS to be lit by the spark after being compressed in the cylinder. The ethyl acetate in the IMCT loosens hydrogen bonds on the gasoline making it easier to light to burn, but the "oil" - heavier hydro-carbon nature keeps the vapor point higher and flash point still low enough to give good performance. (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. Driving on a warm day in heavy stop start traffic it started vapor locking on a climb - using 10% ethanol fuel with no additive . Steve_Mack_CT Fuel Pressure Regulator; Holley fuel pressure regulators are designed to precisely control the fuel pressure from the fuel pump to the carburetor. Holley low pressure reg woes #12-804 | The H.A.M.B. Exclusive, high-quality Global Featured Holley Transmission Kickdown LASTLY on your first issue of understanding vapor lock and boiling point. (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 seat. Holley 12-804 - 2-Port Carbureted Fuel Pressure Regulator How much should I add to every gallon of gas.I believe they are adding about 5% ethanol to the fuel here. But it is not the ethyl acetate alone that causes the effect to raise the vapor temperature point of fuel. Average for the last 12 months. Holley 12-804 Fuel Pressure Regulator | Fuel Pump Shop Point and secure it into a clean container Inlet pressure of 7 psi limitation means your pump can not put out more than 7 psi to the regulator for it to properly operate. Designed using state-of-the-art technology and with customers in mind. December - February gas mixture begins to vaporize at 11-15psi at 105 deg F, April gasoline is 9-11.5 psi at 124 deg F. If you had winter gasoline in your Antique car on a 100 deg day you would only be about 5 degrees from vapor bubbles in the fuel. Holley Fuel Pressure Regulator Rebuild 12-804 - YouTube But, . Does this mean that we are back to the situation described by OD where the lower boiling point additive reduces only the average boiling point? Mounting Bracket Included. 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. The chemistry class experiment you are referring to will yield the approximate boiling (vapor) point at STP - Standard Temperature and Pressure ONLY. Please refresh and try again. 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. Carb Part, 14 PSI Fuel Pressure Regulator Set 3/8in NPT Port 12804 for Holley : Amazon.com.au: Automotive 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. When it burns however, it is an eye and throat irritant, even though it raises octane, burns hotter, easier, and cleaner. All Holley regulators are pre-set at the factory so there is no guesswork when first installing the regulator. The summer gasoline vaporizes in the line and the heat soak is quicker and longer on hot day's. Interesting theory. You'll find they both have the same initial boiling point - been there and done it. 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. . Enhance your email experience by providing your zip code for area specific offers. 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. It IS variable and a result of the various fuel blend components. I recall when Texaco used to advertise their "customized for your area" gasoline, in the earlier 1960s. In some areas, according to the map, RVP can vary from about 7.0 to 9.0 in some of the fuels. So, I take the reg apart to see if it is all clean and looks good. Installation was made more complicated by the absence of a port for a pressure gauge, which means Rusty said any heavier hydrocarbon WILL raise the boiling point - and I said Rusty is correct and OD is wrong. Rich boys replaced their 216 stovebolt 6's with GMC 270 or 302 sixes with a performance "full race" cam. That work continues today through Holleys EFI products as well as through Holleys family of brands. Please try again later. Adjustable from 1 to 4 PSI. Could you explain a little more about how you would run the bypass? As you can see from what it replaces - it is "hot" solvent - but not quite as hot as acetone in its ability to dissolve other things. [endif]--> Many thanks for taking the time to clarify this interesting subject . Decrease pressure by turning the adjustment screw counter-clockwise. Amazon has encountered an error. Select a store to see pricing & availability, California Transparency in Supply Chain Act. Generally speaking if your car was made before 1953 it has low compression. Find an Automotive Service Professional fuel pressure in at the top, fuel pressure out on each side. The other part numbers utilize an AN O-ring inlet, outlet, & return ports, and do not require any sealer on the threads. It's a diaphram with a spring. Kerosene diesel fuel or stove oil will work. 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. FREE SHIPPING on most orders of $35+ & FREE PICKUP IN STORE. Yes the light elements will still be in there. 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. 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. Reasonable . Fuel Pressure Regulator - Walmart.com I commented that it was already vented by the clearance around where the float needle projects through the top but he advised that this was not enough and the vent needed to be at least a 1/4" tube and that he could see it venting vapor. 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. Will changing the orientation change the preset pressure setting (checkball falling instead of raising)? We will have the previous answer corrected. => https://www.holley.com/data/Products/Technical/199R7914-3rev3.pdf. . I mix Industrial Maintenance Coating Thinner (IMCT) around 1 oz per gallon - which is basically a blend of petroleum distillate in the paint thinner / mineral spirits (once called also "white gas") family and ethyl acetate and not only does it cure vapor lock it increases octane because you can feel it in the power and acceleration. Thinking Kerosene is probably the way I will go at this point. finish) . Did not like having to reset to zerobut I did. What I would do, is with the car off, (or electric pump off), turn the screw a good ways out. Prewar cars have very low compression and will run better on gas that has some kerosene added. The term heavy ends may be old fashioned and obsolete. However the part number on the box was 12-804 which should be a 1-4 psi regulator BUT the Part number etched on the unit was 12-804 4.5-9 psi which doesnt exist. Post in the forum instead. 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. . The Holley 12-804 fuel pressure regulator features 3/8" NPT in/out ports. 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. THE SECOND ISSUE - the vapor system on the Packard is going to be a problem no matter what today. Like many others, I have been considering what to do recently. We dont share your credit card details with third-party sellers, and we dont sell your information to others. I have just this Spring started taking temp. '92 Ford Mustang GT: 385"/6.3L SBF, Dart SHP 8.2 block, forged steel crankshaft & H-beam rods, forged pistons, Trick Flow Twisted Wedge . Q: We encountered an error while updating this page. Too much fuel pressure for a given needle and seat . Shiny Finish. P/N 12-803, 12-803BP, & 12-804 Installation Instructions 199R7914-3 NOTE: 12-803BP IS NOT TO BE USED WITH MECHANICAL FUEL PUMPS! . . 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. Part Number: HLY-12-803. 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. Holley's products also include performance fuel pumps, intake manifolds and engine dress-up products for street performance, race and marine applications. I turned into a side street and opened the hood. I switched on the electric pump and it instantly picked up and ran for a few seconds then reverted to the classic vapor lock symptoms. Shop Fuel Pressure Regulators at Summit Racing. The following vehicles are considered Uncontrolled (Non-Emissions Controlled) Vehicles: WARNING: It is against the law to install this part on an Emissions Controlled Vehicle. Holley HOL 12-804 12-804 Fuel Pressure Regulator Please try again. Shipping was fairly fast. The Holley 12-804 fuel pressure regulator is adjustable from 1-4 psi. Wouldn't the water still evaporate at the same temp? Among other places on the web - you will find a fairly good dissertation of the issue at => Evergreen Performance Systems, Inc. and Hydrogen Power Central | The true source for powering engines with Hydrogen - not "HHO". . So in an open cup the boiling points would also appear the same as water but under pressure the boiling point is different. Vapor lock was just a fact of life for the Fords. Terms of Service. Inlet from fuel pump is at bottom. From that time on octane ratings slowly rose, helped by the addition of more and more tetraethyl lead. This approach is not recommended for higher compression cars made from the mid fifties onwards. Unfortunately, this fuel pressure regulator does not even come close to regulating the pressure and keeping the pressure down. Will buy again if I need another one for a different project. 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. Note also that PURE ethylene glycol is also flammable but also miscible with water. We currently do not have an estimate when this item will ship. ). GENUINE Holley 12-804 CHROME 1-4 PSI Adjustable Fuel Pressure Regulator Kit $49.99 Free shipping Holley 12-804 Carbureted Fuel Pressure Regulator $37.07 +$14.99 shipping Holley 12-804 Chrome Street Strip Fuel Pressure Regulator 1-4 PSI $54.53 Free shipping Holley Performance 12-804 Fuel Pressure Regulator $54.53 Free shipping Holley 12-804 $55.86 Holley Fuel Pressure Regulator 12-804 - Advance Auto Parts store Adjustable Fuel Regulation From 1 To 4 PSI.220 Inch 7/32 Inch Restriction. Please try again. The only difference that the Holley tech told me between the two springs is the color. Join Date: Nov 2007 Posts: 22035 Share Tweet #2 Also, what is it about Kerosine, and possibly the products like LeadMx or Marvel Mystery Oil (mentioned specifically in the article) that drive some improvement? (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). %PDF-1.4 Holley Bracket Secondary Adjusting Lever Kit Steel Gold Iridited Holley 4150. [endif]-->