This product is made of high-quality materials to serve you for years to come. . I have largely eliminated this problem with all fuel system components rebuilt, and an electric fuel pump but will get occasional stumble with a hot (after say, an hour run) engine idling or in traffic if it is say, 80 or hotter out. . THE SECOND ISSUE - the vapor system on the Packard is going to be a problem no matter what today. 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. It feeds fuel directly from the tank to the carburettor. Inlet from fuel pump is at bottom. Check the status of your Can you adjust the fuel pressure? Works, don't use a liquid filled gauge in an engine compartment! I have used kerosene to avoid vapor lock and there is no doubt it helps, the more the better up to 20% in a low compression 1920's car. It's unlikely that anything's stuck. I had hoped that the cooler fuel from the electric pump would solve the problem but it did not. Rusty, thanks so much for this information. You'll find they both have the same initial boiling point - been there and done it. To see our price, add these items to your cart. As Raywith pointed out, you need to let the pressure go somewhere. 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. 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. The regulator that was shipped to me has an internal spring from a different model of regulator, the spring should be red. There is no "chemistry set" method to measure fuel vapor points. NPT Inlet Attachment: te4cmCbGnt]&~`N@RPyBTa$=~fo:/T 92YE)3Uofo4Ou].-zowDt*ae^qf9z/?. As an example water would boil and thus "vapor lock" at a really low temperature without ethylene glycol. ESPECIALLY a 10% ethanol blend - once generically called the gasohol summer blend in that vapor system would really be a problem. Show details Each Holley fuel pressure regulator is fully adjustable so regulating the fuel pressure to your engines needs is a simple task. 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. 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. Shiny Finish. 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. Please use a different way to share. At first it seemed fine, set it to 1.5 PSI and away we go. 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. Reviewed in the United States on April 2, 2022. Why does this occur only under increased pressure? You may receive a partial or no refund on used, damaged or materially different returns. 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. 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. Try it, I think you will find it works. . 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. The 12-803 BP is a By-Pass design of the same style. There is no hard and fast cutoff for any of these. 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. If so how? P/N 12-803, 12-803BP, & 12-804 Installation Instructions 199R7914-3 NOTE: 12-803BP IS NOT TO BE USED WITH MECHANICAL FUEL PUMPS! What Rusty writes IS correct. Octane is an actual chemical which would be at the light end of the scale for gas, kerosene would be at the heavy end. Product very good. Cool. Click here to find a Hydrogen Power Central | The true source for powering engines with Hydrogen - not "HHO", Standard conditions for temperature and pressure - Wikipedia, the free encyclopedia, https://www.holley.com/data/Products/Technical/199R7914-3rev3.pdf. 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. Prewar cars have very low compression and will run better on gas that has some kerosene added. One is a deadhead and one is a by-pass. Worked well out of the box. WARNING! 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. Right & left, Customer Reviews, including Product Star Ratings help customers to learn more about the product and decide whether it is the right product for them.Learn more how customers reviews work on Amazon. Holley Fuel Pressure Regulators 12-803 HLY-12-803. Holley HOL 12-804 12-804 Fuel Pressure Regulator; ; Customer reviews . The reg takes 3/8" fittings and the gauge takes 1/8" fittings. Learn more about our My car runs and idles fine with no flooding when running with the electric pump, the flooding only occurred once when it vapor locked. None of them worked. I have no idea - you are in uncharted territory. Generally speaking if your car was made before 1953 it has low compression. Q: Could you explain a little more about how you would run the bypass? http://www.frontieroil.com/attachments/contentmanagers/106/PrdctsSpec_UnleadGasSpecs.pdf. 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. We will have the previous answer corrected. Will rise to above 180 degrees on the Temperature gauge. Your question might be answered by sellers, manufacturers, or customers who bought this product. 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. Regards, Mike. Add to cart. the installation of a Holley 12-810 oil pressure safety switch is recommended for installation into the wiring circuit. 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. Unfortunately, this fuel pressure regulator does not even come close to regulating the pressure and keeping the pressure down. Is it a product that would be sold by a panel beater's supply shop? 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. It is a measure, as I understand it, of how readily the fuel will evaporate in open air. use a 1/16 - 1/8" restrictor in the end of your fuel line to see if you can set the pressure then. You need to be a member in order to leave a comment. Carb Part, 14 PSI Fuel Pressure Regulator Set 3/8in NPT Port 12804 for Holley : Amazon.com.au: Automotive 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. Too much anti-freeze - (typically ethylene glycol) causes the opposite effect even under pressure of the cooling system. Holley Bracket Secondary Adjusting Lever Kit Steel Gold Iridited Holley 4150. Interesting that the writer suggests certain additives can raise boiling point of gas in the first section. if you were packing them in boxes they would look identical. There is a light spring that helps push the ball against the the seat in the direction of the fuel flow. Log In / Register Order Status. MFG. Can i install a fuel pressure guage on the unit itself? 0 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. . In some areas, according to the map, RVP can vary from about 7.0 to 9.0 in some of the fuels. Part #: 12-807. . The higher the RVP, the greater the tendency to vaporize or vapor lock. Profile Page . Quick & Hassle Free. As the car is parked Temperature. [endif]--> http://www.bp.com/liveassets/bp_internet/retail/retail_australia/STAGING/local_assets/downloads_pdfs/f/FN_modern_petro_vintage_engines.pdf,