I have heard true lead (LeadMax2000 or simillar) may do this as well? All kinds of remedies were tried. All Holley regulators are pre-set at the factory at 2.8 PSI so there is no guesswork when first installing the regulator. The Holley 12-804 is a 1 to 4 range PSI regulator. I have already been thinking about switching over to a modern fuel pump, say the Mallory 110, plumbing in a regulator just downstream of the carbs, and taking the bypass fuel back to the fuel tank. 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. Volatility is a measure of the gasolines tendency to vaporize under a given set of conditions. Will rise to above 180 degrees on the Temperature gauge. ${cardName} not available for the seller you chose. i'm trying to figure out why you are running a T when there are two outlets. Rusty said any heavier hydrocarbon WILL raise the boiling point - and I said Rusty is correct and OD is wrong. I remember when I was a teen in the 50's and everyone had a flathead Ford V8 or a Chevy stovebolt 6. Enhancements you chose aren't available for this seller. Yes, you will need to buy the type of connection you want to use such as hose barb, compre. This item cannot be shipped to your selected delivery location. [endif]-->, . Gasoline at the pump is a blend of different chemicals. We work hard to protect your security and privacy. Is there a brand name? What one is after is new "liquid" fuel which vaporizes easily in open air, lights easily and has a rapid flame spread but NOT a hot explosive one, and burns easily and completely under one atmosphere of pressure - what we call 14.7 to 1 - BUT - and this is most important; does not auto-ignite at a low temperature and WAITS to be lit by the spark after being compressed in the cylinder. There is a light spring that helps push the ball against the the seat in the direction of the fuel flow. Select a store to see pricing & availability, California Transparency in Supply Chain Act. Neither the Holley instructions nor anywhere I can find says what the maximum inlet PSI should be allowed to the regulator - but I was told it was 16 psi and one other spot on the web says something similar. This approach is not recommended for higher compression cars made from the mid fifties onwards. P/N 12-803, 12-803BP, & 12-804 Installation Instructions 199R7914-3 NOTE: 12-803BP IS NOT TO BE USED WITH MECHANICAL FUEL PUMPS! This product is universal and applies to all vehicles. In some areas, according to the map, RVP can vary from about 7.0 to 9.0 in some of the fuels. Does this need to be mounted upright or is it ok on its side? You set it to the exact fuel pressure you want. . Post in the forum instead. That work continues today through Holleys EFI products as well as through Holleys family of brands. 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. (see reg-setp.pdf), This is the same design as a Holley 12-803 or 804 knock off, so I looked up Holley's instructions. Adjustable fuel regulation from 1 to 4 psi, Holley 12-804 Reg, Fuel Press 1-4 Psi Pol. Too much fuel pressure for a given needle and seat assembly can overload the needle and seat and may cause flooding or drivability problems. See Standard conditions for temperature and pressure - Wikipedia, the free encyclopedia. MFG. FREE SHIPPING on most orders of $35+ & FREE PICKUP IN STORE. (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. Had to reset to Zero. Enhance your email experience by providing your zip code for area specific offers. readings of the carb. Note also that PURE ethylene glycol is also flammable but also miscible with water. The 12-803 BP is a By-Pass design of the same style. If this is true, how come adding antifreeze to water raises the boiling point? 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. Each Holley fuel pressure regulator is fully adjustable so regulating the fuel pressure to your engines needs is a simple task. 3/8 Inch NPT Ports 1 Inch 2 Out. Lower octane will not hurt your car if the compression is low. Holley 12-803 Two Port Chrome Fuel Pressure Regulator - 1-4 PSI.
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