Designed using state-of-the-art technology and with customers in mind. 1996-2023, Amazon.com, Inc. or its affiliates, Select a location to see product availability, Holley HOL 12-804 12-804 Fuel Pressure Regulator. Holley(R) has been the undisputed leader in fuel systems for over 100 years. Shipping cost, delivery date, and order total (including tax) shown at checkout. 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. 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. Sorry, we were unable to perform your search at this time. The only difference that the Holley tech told me between the two springs is the color. Regulator Box showed signs of being opened and clumsily closed and the advertised Rubber Gasket or Gaskets that were mentioned in the instructions were missing. Too much fuel pressure for a given needle and seat assembly can overload the needle and seat and may cause flooding or drivability problems. Full content visible, double tap to read brief content. At first it seemed fine, set it to 1.5 PSI and away we go. You could arrange them on a scale from naptha gas, gasoline, kerosene, stove oil, diesel fuel, light lubricating oil, heavy lubricating oil, grease, asphalt. The peak was reached in the sixties when heavily leaded gas of over 100 octane was available. For the best experience please upgrade or visit the site on another browser. 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. We encountered an error while updating this page. Please make sure that you are posting in the form of a question. Each Holley fuel pressure regulator is fully adjustable so regulating the fuel pressure to your engines needs is a simple task. Works, don't use a liquid filled gauge in an engine compartment! If so how? Holley carburetors have powered every NASCAR(R) Sprint(R) Cup team and nearly every NHRA(R) Pro-Stock champion for four decades. In fact I can completely remove the adjusting screw and it still does not go down to 3psi. I would welcome your advice on this - with apologies for the length of this post. So if you're looking for a FPR to get 1-4 psi, then the 12-804 is no longer your best choice. 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". I did, works great & looks beautiful. If the carbs are drawing fuel and you lower the pressure at the reg, it should show on the gauge. The first opportunity to try it occurred recently. Prewar cars have very low compression and will run better on gas that has some kerosene added. Will changing the orientation change the preset pressure setting (checkball falling instead of raising)? 3 0 obj <>stream 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. Decrease pressure by turning the adjustment screw counter-clockwise. You would'nt just be reading the inlet pressure would you? I adjust it up to 2.5 pounds and clean my hands. As an example water would boil and thus "vapor lock" at a really low temperature without ethylene glycol. THESE INSTRUCTIONS MUST BE READ AND FULLY UNDERSTOOD BEFORE BEGINNING THE . Lower octane will not hurt your car if the compression is low. CALIFORNIA WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov. 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 other possibility is that it is due to the higher pump pressure. . I have just this Spring started taking temp. 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. Shipping was fairly fast. In the early days of the oil business the demand was for kerosene or coal oil. What I would do, is with the car off, (or electric pump off), turn the screw a good ways out. Interesting that the writer suggests certain additives can raise boiling point of gas in the first section. Carb Part, 14 PSI Fuel Pressure Regulator Set 3/8in NPT Port 12804 for Holley : Amazon.com.au: Automotive 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. IMCT is found in the paint isle of any hardware or home improvement store usually in quart or gallon cans. Chemistry does NOT work that way - just like adding more any one ingredient to a cake mix will make the cake better. Our payment security system encrypts your information during transmission. [endif]--> Many thanks for taking the time to clarify this interesting subject . No issues. Shopping Cart There's always a catch with bargains, Reviewed in the United States on July 9, 2022. Can you adjust the fuel pressure? Loosening the regulator locknut and turning the adjustment screw clockwise increases the pressure. 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. Sign up for a new account in our community. By Interesting theory. 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. Reviewed in the United States on April 2, 2022. 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. All petroleum distillates have different chemical properties which change depending on what you mix them with. #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? [endif]-->. P/N 12-803, 12-501, 12-804, 12-500, & 15812NOS Installation Instructions WARNING! Holley Bracket Secondary Adjusting Lever Kit Steel Gold Iridited Holley 4150. should be one inlet in two outlets out, i've seen very smart mechanically inclined people hook the carb to one outlet and the pressure in to the other, it's easy to do, not saying anything bad but could be a a possibility. Open the unit and check the spring color, Reviewed in the United States on April 9, 2018. Gasoline at the pump is a blend of different chemicals. near you The other part numbers utilize an AN O-ring inlet, outlet, & return ports, and do not require any sealer on the threads. Everything does just fine, until temperatures rise above 80 degrees or so, as they are soon to do. Exclusive, high-quality Global Featured Holley Transmission Kickdown Cable Bracket 20-121; Gold Zinc Steel for 700R4 . http://www.bp.com/liveassets/bp_internet/retail/retail_australia/STAGING/local_assets/downloads_pdfs/f/FN_modern_petro_vintage_engines.pdf, ,