My bypass line has a shut-off valve that I can use to manually adjust the pressure, but when air bubbles develop within the input fuel line, this valve requires adjustment to maintain the fuel pressure. Unfortunately, these FPR are now made in Korea and they no longer include an alternate spring. The chemistry class experiment you are referring to will yield the approximate boiling (vapor) point at STP - Standard Temperature and Pressure ONLY. All kinds of remedies were tried. What if any additives would do this and why? [endif]--> Many thanks for taking the time to clarify this interesting subject . . 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. Now, Holley EFI is dominating the performance world as well as our products for GM's LS engine. 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. Turn the screw out to lower the pressure. I would welcome your advice on this - with apologies for the length of this post. Copyright 2023, Antique Automobile Club of America. Holley Fuel Pressure Regulators 12-803 HLY-12-803. IMCT is found in the paint isle of any hardware or home improvement store usually in quart or gallon cans. I put it . I'm suggesting to raise the boiling point by adding heavier or oilier substances such as kerosene. Of course you may already have this setup - that is the first issue. This product is made of high-quality materials to serve you for years to come. I recently fitted an electric fuel pump to one of the cars. Usually, just runs really lean for a couple of minutes, and will not go above idle until fresh fuel finally clears through. 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. A: Show details It does however produce an irritating fume that irritates the eyes and mucous membranes when burning in gasoline. I ordered the 12-804 regulator online because I couldn't find one locally, this is for an engine on a piece of equipment that I make my living with. The engine was running. 4.9. It will meet your needs and deliver great quality at an affordable cost. 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 . I turned into a side street and opened the hood. 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. In this document is a chart for Seasonal Gasoline Specifications. Rusty, thanks so much for this information. 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. Going to check my VW bus fuel pump pressure. All Holley regulators are pre-set at the factory at 2.8 PSI so there is no guesswork when first installing the regulator. 2-Port Carbureted Fuel Pressure Regulator (12-804) by Holley. fuel pressure in at the top, fuel pressure out on each side. I prefer to keep things simple but I appreciate the more correct technical approach. 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. This experience ties with that the owner of a very early Twin Six Packard. CALIFORNIA WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov. 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. Then I got this good one, to try to get 1.5 PSI to the Kadrons. . It's easy! Fuel pump regulator has 3/8" NPT inlet/outlet ports. Please make sure that you are posting in the form of a question. Gasoline was so light if you left the cap off a gallon can it would all evaporate in a few days. Quadrajets should have 6 to 9 at the inlet or they flood past the needle seats. Why does this occur only under increased pressure? [endif]-->
