Reviewed in the United States on June 20, 2021. One common problem is when you have an abnormally warm day in the winter, and the low vapor pressure gasoline in the car will vapor lock on that hot day. Open the unit and check the spring color, Reviewed in the United States on April 9, 2018. That's where the pressure was going. Please try again later. Changing the vapor pressure (and thus the boiling point) of gasoline is not new. Check the status of your NPT Inlet Attachment: Holley HOL 12-804 12-804 Fuel Pressure Regulator. ESPECIALLY a 10% ethanol blend - once generically called the gasohol summer blend in that vapor system would really be a problem. Q: OD says the Boiling point of gasoline cannot be raised by adding a heavier hydrocarbon - such as kerosene or diesel - and points to a high school chemistry class experiment as his proof. The regulator that was shipped to me has an internal spring from a different model of regulator, the spring should be red. It takes a lot to hurt today's stainless steel valves, but in an older car be careful - and an exhaust gas temperature gauge is not a bad idea to invest in. MFG. It does however produce an irritating fume that irritates the eyes and mucous membranes when burning in gasoline. It was about this time that car makers lowered the compression ratios, went to long stroke motors, and developed hot spots and vaporizers on their intakes to burn the new low grade or low octane gas. 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. The higher the RVP, the greater the tendency to vaporize or vapor lock. CALIFORNIA WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov. Reviewed in the United States on June 5, 2022. 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. Shipping cost, delivery date, and order total (including tax) shown at checkout. 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. Everything does just fine, until temperatures rise above 80 degrees or so, as they are soon to do. As Raywith pointed out, you need to let the pressure go somewhere. "Pure" Ethyl Acetate could be called an "alcohol" as Ethyl acetate is the ester of ethanol and acetic acid; and it is manufactured on a large scale for use as a solvent. Too much fuel pressure for a given needle and seat . US $57.76 Finish:Gold Zinc billet aluminum bracket that conveniently mounts a 12-803 Black anodized 12-804 or 12-803BP fuel pressure regulator utilizing the passenger side carb studs on any 4150 / 4160 style carburetor. The other part numbers utilize an AN O-ring inlet, outlet, & return ports, and do not require any sealer on the threads. A by-pass style regulator has the fuel coming in the same side of the check ball as where the fuel comes out to the carb. Holley 12-804 Fuel Pressure Regulator Brand: Holley 415 ratings -11% $6614 Was: $73.94 3/8" pipe thread ports 7/32" restriction Pressure ranges from 1 to 4 PSI Includes mounting bracket Satin finish See more product details + + Total price: $115.81 Add all three to Cart These items are shipped from and sold by different sellers. loyalty program It will get you close. Remember STILL transporting fuels was a dangerous thing - and higher grade fuel could just as easily have exploded on it's way to the fueling station or in those glass top hand operated early gas pumps on a hot day. A vapor lock condition would be caused. Use with standard pump only - not recommended for maximum pressure pumps. 3 0 obj <>stream 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. 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. GENUINE Holley 12-804 CHROME 1-4 PSI Adjustable Fuel Pressure Regulator Kit $49.99 Free shipping Holley 12-804 Carbureted Fuel Pressure Regulator $37.07 +$14.99 shipping Holley 12-804 Chrome Street Strip Fuel Pressure Regulator 1-4 PSI $54.53 Free shipping Holley Performance 12-804 Fuel Pressure Regulator $54.53 Free shipping Holley 12-804 $55.86 There was a problem completing your request. Interesting that the writer suggests certain additives can raise boiling point of gas in the first section. (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. Fuel pressure regulators are used to adjust for fuel pressure requirements of various carburetors. Got a gauge on the FPR to monitor, and at first it was great. . THE SECOND ISSUE - the vapor system on the Packard is going to be a problem no matter what today. Holley 12-804 Fuel Pressure Regulator 3/8 pipe thread ports 7/32 restriction Pressure ranges from 1 to 4 PSI Includes mounting bracket Satin finish This regulator is used to adjust to fuel pressure requirements of various carburetors and supplies the proper pressure to the needle and seat valve to prevent flooding or drivability problems. All Holley regulators are pre-set at the factory at 2.8 PSI so there is no guesswork when first installing the regulator. Use with standard pump only -not recommended for maximum pressure pumps. One needs to have studied Chemistry as I have to actually know how this works. I cannot help you - and no one can without knowing the exact make up of the gasoline being refined where you are. This approach is not recommended for higher compression cars made from the mid fifties onwards. The Holley Fuel Pressure Regulator (Part No. Putting kerosene into gasoline - while both are hydrocarbons - and they will blend - the lighter oil nature of the kerosene to the solvent of gasoline; in an amount of 5% is not enough to change the STP vapor point of the gasoline, but it will weaken the octane rating of the gasoline enough to feel it under acceleration AND under pressure will raise the vapor point enough to perhaps prevent vapor lock depending on the ambient and under hood temperatures of where one is located. [endif]-->