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. Copyright 2023, Antique Automobile Club of America. Also in Tools, Shop Equipment & Chemicals, Cataclean - Fuel and Exhaust System Cleaner, Cataclean Diesel - Fuel and Exhaust System Cleaner, Distribution Blocks, Filters, Adapters and Fittings, Microswitch and Solenoid Mounting Brackets, Mr. Gasket Fuel Pressure Gauge - 0-15 PSI - 1-1/2 Inch Diameter, Mr. Gasket Fuel Block with 0-15 PSI Liquid Filled Fuel Pressure Gauge, 25 GPH Holley Mighty Mite Electric Fuel Pump, 1.5-4 PSI, Earl's Fem.1/8" NPT to Male 3/8" NPT Pipe Bushing Reducer. Like many others, I have been considering what to do recently. Show details #2. Shiny Finish. ). Use with standard pump only -not recommended for maximum pressure pumps. The two will be very close to the same just as would Water and Anti-Freeze boiled in an open pot. The first opportunity to try it occurred recently. 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 part number for the kit is 12-807; Summit sells it for about $6. For cars that require 4.5 to 9 PSI, the Holley 12-803 is the right model. If the carbs are drawing fuel and you lower the pressure at the reg, it should show on the gauge. The BP article explains causes - not how to change fuel formulations - so for this discussion it explains nothing. Does this need to be mounted upright or is it ok on its side? 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. Yes you can adjust fuel pressure with this regulator. We encountered an error while updating this page. order The regulator that was shipped to me has an internal spring from a different model of regulator, the spring should be red. Somewhat of an inconvenience but that's why it's probably cheaper than other places selling the same part number. The issue is simple that one is seeking to "re-blend" their own gasoline from one already sold. Regards, Mike. I prefer to keep things simple but I appreciate the more correct technical approach. Decrease pressure by turning the adjustment screw counter-clockwise. Recommended Parts. Thanks to all contributors, particularly the information from Rusty, Bob and David. Cool. 4.25 out of 5 stars. Reviewed in the United States on June 5, 2022. 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. But the heavier elements will raise the boiling point of the mixture. readings of the carb. finish) . 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. => https://www.holley.com/data/Products/Technical/199R7914-3rev3.pdf. Reid Vapor Pressure (RVP) is a commonly used indicator of gasoline volatility. 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I take this to mean that the separate boiling points of the constituents occur at atmospheric pressure but at higher pressure the resulting mix has a single boiling point. Each Holley fuel pressure regulator is fully adjustable so regulating the fuel pressure to your engines needs is a simple task. Lots of Chinese Holley 12-803, 804 etc knock-offs are available. For more information go to www.P65Warnings.ca.gov. I appreciate it. What you write in post 12 is NOT correct. There is a light spring that helps push the ball against the the seat in the direction of the fuel flow. $41.19. Fuel Pressure Regulators Instruction Sheet (42712804), Designed to be used with standard pump only, Measures 2-1/2" wide and 1-1/2" tall and deep, This low pressure fuel regulator is factory-set to 2.7 PSI, but is fully adjustable from 1 to 4 PSI, It includes mounting bracket with 2 each self-tapping screws for regulator to bracket installation purposes and 3 screws for bracket to vehicle installation, 1-3/4" hole spacing to mount the regulator to the bracket. Error posting question. The engine was running. 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. Yes, you will need to buy the type of connection you want to use such as hose barb, compre. near you 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. I've had some luck using LeadMax2000 but it's not a 100% cure. 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. So with that vapor fueling system - you are stuck "downgrading it" to a lower quality fuel. 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. . 03-28-2012, 03:04 AM. 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. 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. Q: But, . Too much anti-freeze - (typically ethylene glycol) causes the opposite effect even under pressure of the cooling system. . Rusty, if you can find a cooperative local high school chemistry class, take a small amount of gasoline, split it into 2 portions, add 5% or so kerosene to one half, and have them do a fractional distillation on both. Average for the last 12 months. I had a chrome dial regulator, which leaked gas everywhere but luckily didn't actually burn down my ride. There is no hard and fast cutoff for any of these. For the best experience please upgrade or visit the site on another browser. The summer gasoline vaporizes in the line and the heat soak is quicker and longer on hot day's. store A: This is the complex world of Chemistry - which is far too complex to go into here. I do wish there were some stamped values on the adjustment screw like other models I have seen. Octane is an actual chemical which would be at the light end of the scale for gas, kerosene would be at the heavy end. Another thing you can do is wire the fuel pump to be hot in run and start through an oil pressure switch - so if the motor shuts off or looses oil pressure the fuel pump shuts off too. 2023 Holley Performance Products, Inc. All Rights Reserved. September 21, 2010 in Technical. the installation of a Holley 12-810 oil pressure safety switch is recommended for installation into the wiring circuit. Volatility is a measure of the gasolines tendency to vaporize under a given set of conditions. Ships from and sold by Performance Guarantee. 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. That's where the pressure was going. Shipping was fairly fast. Includes initial monthly payment and selected options. By 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. 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. I have adjusted a 6-9 lbs pump down. Adjusting Holley & Demon Mixture Screws; Holley Specs HP Series; Edelbrock Carburetor Specs; Holley Double Pumper 4150 Specs; Carter Competition Series AFB Specs; Company Info. So this thread has been a great find for me particularly at this time. You could arrange them on a scale from naptha gas, gasoline, kerosene, stove oil, diesel fuel, light lubricating oil, heavy lubricating oil, grease, asphalt. See also Tom Ogle's "modern" vapor fueling system - google it. Boiling is a violent version of vaporizing. Please try again later. Can i install a fuel pressure guage on the unit itself? Quick & Hassle Free. 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. 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". 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. HWYoF~Ta77[Z4"bG K=yK Everything does just fine, until temperatures rise above 80 degrees or so, as they are soon to do. do you have a picture of it hooked up? Full content visible, double tap to read brief content. See Standard conditions for temperature and pressure - Wikipedia, the free encyclopedia. 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. I'm suggesting to raise the boiling point by adding heavier or oilier substances such as kerosene. here's one installed,same holley low pressure regulator, line pressure in the top, one side is hooked to the fuel pressure sender, other to the line going to the fuel block. Was actually disappointed with the quality of the regulator. 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. Join Date: Nov 2007 Posts: 22035 Share Tweet #2 Chemistry does NOT work that way - just like adding more any one ingredient to a cake mix will make the cake better. Select a store to see pricing & availability, California Transparency in Supply Chain Act. Holley 12-804 1-4 Psi Carbureted Two Port Fuel Pressure Regulator: Item #: HLY12-804 : Quantity: Price: $53.99 Add to cart . This part is Backordered. Yes. 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 will be trying one of these but am curious what is the active ingredient(s). I had a chrome dial regulator, which leaked gas everywhere but luckily didn't actually burn down my ride. So in an open cup the boiling points would also appear the same as water but under pressure the boiling point is different. 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. I look upon that effort with a heavy heart though, for I have been religious about keeping the old car original as possible. 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. 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. 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. Post in the forum instead. 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. One is a deadhead and one is a by-pass. Usually, just runs really lean for a couple of minutes, and will not go above idle until fresh fuel finally clears through. 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. Loosening the regulator locknut and turning the adjustment screw clockwise increases the pressure. Never had it act up while running, but since E10 fuel came along it is borderline getting started after hot shutdowns. The reg takes 3/8" fittings and the gauge takes 1/8" fittings. Prewar cars have very low compression and will run better on gas that has some kerosene added. The Holley 12-804 is a 1 to 4 range PSI regulator. All Holley regulators are pre-set at the factory at 2.8 PSI so there is no guesswork when first installing the regulator. Each Holley fuel pressure regulator is fully adjustable so regulating the fuel pressure to your engines needs is a simple task. Purchased the regulator from Baxter, unit arrived in 4 days.. 9 really is max. 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. Tags: None TheSilverBuick ALMOST Spidey ! That work continues today through Holleys EFI products as well as through Holleys family of brands. 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. If so how? Please use a different way to share. 1996-2023, Amazon.com, Inc. or its affiliates, Select a location to see product availability, Holley HOL 12-804 12-804 Fuel Pressure Regulator. (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. Copyright 2008-2023 OReilly 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. In fractional distillation (the refining of oil) - what we call "mineral spirits", "paint thinner", "kerosene" and "diesel fuel" all ALL "heavier" hydrocarbons (pretty much in that order) than what we call gasoline - in that they occur lower in the distillation tower and condense at lower temperatures back into liquid before what we call "gasoline" does. Boy am I glad to have happened on this thread. 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. 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. For now, in 70 degrees ambient, the bowls are 100 F. at shut-down and after 15 minutes they rise to 115 F. At these temperatures the engine starts back up fine, but I believe another ten degrees will be in the problem zone. This will keep your pressure steady and have instant pressure change when adjusting. Going to check my VW bus fuel pump pressure. [endif]-->.
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