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Will changing the orientation change the preset pressure setting (checkball falling instead of raising)? This part is legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles. #2. 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. PDF Holley Billet Fuel Pressure Regulators P/N 12-841, 12-842, 12-845, 12 Much of the excess engine heat will end up soaking the fuel system under the hood. May God's grace bless you in the Lord Jesus Christ. The intent being to get "cool" fuel to the carburettor bypassing the areas where the system heats the fuel. Please choose a different delivery location. PDF Holley 12-803BP Fuel Pressure Regulator Installation Instructions - JEGS However I would welcome you advice on the following. If so how? Yes, you will need to buy the type of connection you want to use such as hose barb, compre. Takes a little time to peel back the rubber case then remove the glass with a fine blade screwdriver, reset to zero. ). Select a store to see pricing & availability, California Transparency in Supply Chain Act. It feeds fuel directly from the tank to the carburettor. Regards, Mike. 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. All Holley regulators are pre-set at the factory so there is no guesswork when first installing the regulator. [endif]-->. Each Holley fuel pressure regulator is fully adjustable so regulating the fuel pressure to your engines needs is a simple task. Holley 12-840 4.5-9 PSI Adjustable Billet Fuel Pressure Regulator with I cannot help you - and no one can without knowing the exact make up of the gasoline being refined where you are. All Holley regulators are pre-set at the factory at 2.8 PSI so there is no guesswork when first installing the regulator. 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. 3/8 Inch NPT Ports 1 Inch 2 Out. 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. Free shipping for many products! You can wire a by-pass switch for priming if it is really required. 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. #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? The carb should not flood even with the pump running unless it is putting out enough pressure to over come the float bowl shut off mannerism mechanism of the carb. 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. Chrome Finish. I have a holley low pressure reg. Too much fuel pressure for a given needle and seat assembly can overload the needle and seat and may cause flooding or drivability problems. 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. Exclusive, high-quality Global Featured Holley Transmission Kickdown Cable Bracket 20-121; Gold Zinc Steel for 700R4 . Its a bypass arrangement with non return valves to prevent reverse flow and is operated by a switch for use in event of vapor lock. The BP article explains causes - not how to change fuel formulations - so for this discussion it explains nothing. Could you explain a little more about how you would run the bypass? The pressure regulator works fine when mounted flat, but should work ok when mounted on it. 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. 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. Shopping Cart There is supposed to a marking on the spring with the correct color, red or gold if it is the low pressure spring. 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. 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. For over a century Holley has driven the cutting edge of fuel-system design. 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. Enhancements you chose aren't available for this seller. Yes you can adjust fuel pressure with this regulator. Please try again later. ***The inlet pressure limitation is 7 psi. There is no hard and fast cutoff for any of these. 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. The Holley Fuel Pressure Regulator (Part No. Lots of Chinese Holley 12-803, 804 etc knock-offs are available. LASTLY on your first issue of understanding vapor lock and boiling point. Discussion in 'The Hokey Ass Message Board' started by oldrelics, Oct 12, 2010. So if you're looking for a FPR to get 1-4 psi, then the 12-804 is no longer your best choice. From that time on octane ratings slowly rose, helped by the addition of more and more tetraethyl lead. In fact I can completely remove the adjusting screw and it still does not go down to 3psi. I am intrigued by you statement, "Once these chemicals are blended - the over-all resulting chemical properties - especially boiling point under pressure is changed - they are NO LONGER SEPARATE boiling points in play.". Installation was made more complicated by the absence of a port for a pressure gauge, which means The vapor lock issues that I have are with 1920's Packards where the fuel system is essentially at atmospheric pressure throughout. Holley 12-804 Holley Fuel Pressure Regulators | Summit Racing You could arrange them on a scale from naptha gas, gasoline, kerosene, stove oil, diesel fuel, light lubricating oil, heavy lubricating oil, grease, asphalt. $5 Off Your $100 Mobile App Purchase . This satin finish regulator feature 3/8 pipe thread . Any of these heavier than gasoline petroleum distillates above will raise the vapor point of gasoline if mixed into it. Overview. [endif]-->