${cardName} not available for the seller you chose. I have heard true lead (LeadMax2000 or simillar) may do this as well? Part #: 12-807. . But it is not the ethyl acetate alone that causes the effect to raise the vapor temperature point of fuel. Reviewed in the United Kingdom on January 31, 2016, Reviewed in Canada on January 27, 2023, Reviewed in Canada on December 18, 2019, Reviewed in Canada on November 10, 2020, Automotive Performance Fuel Injection Systems, Automotive Replacement Fuel Injection Pressure Regulators, Learn more how customers reviews work on Amazon, Holley 12-804 Reg, Fuel Press 1-4 Psi Pol. I am not going to quote all you said, but the flooding from the electric pump was caused by too much fuel pressure over coming the needle seat (or whatever kind of seat it has for the bowl) of the carburetor. THESE INSTRUCTIONS MUST BE READ AND FULLY UNDERSTOOD BEFORE BEGINNING THE . Full content visible, double tap to read brief content. 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.". The Holley 12-804 fuel pressure regulator features 3/8" NPT in/out ports. I think we have hijacked Steve's thread where he asked the question about raising the boiling point of gas which hopefully has been fully answered by these side issues. 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. I switched on the electric pump and it instantly picked up and ran for a few seconds then reverted to the classic vapor lock symptoms. The other part numbers utilize an AN O-ring inlet, outlet, & return ports, and do not require any sealer on the threads. The other possibility is that it is due to the higher pump pressure. Holley fuel pressure regulator 12-803 instructions for a bad /189/ P/N 12-803, 12-501, 12-804, 12-500, & 15812NOS Installation Instructions WARNING! Ships from and sold by Performance Guarantee. Holley's products include carburetors, fuel pumps, fuel injection, intake manifolds, and much more. 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. In a deadhead design the fuel comes into the regulator from the bottom past a check ball which is held open by a pin on the diaphragm. The two will be very close to the same just as would Water and Anti-Freeze boiled in an open pot. couple more questions, Rusty, what exactly are "heavy ends"? I have the one I have set up in a deadhead setup. [endif]--> Many thanks for taking the time to clarify this interesting subject . 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. This diaphragm repair kit is for 12-803 and 12-804 regulators. There's always a catch with bargains, Reviewed in the United States on July 9, 2022. September 21, 2010 in Technical. Fuel pressure regulators are used to adjust for fuel pressure requirements of various carburetors. 4.25 out of 5 stars. 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. Regulator Box showed signs of being opened and clumsily closed and the advertised Rubber Gasket or Gaskets that were mentioned in the instructions were missing. I commented that it was already vented by the clearance around where the float needle projects through the top but he advised that this was not enough and the vent needed to be at least a 1/4" tube and that he could see it venting vapor. It's not the vendor's fault, these things should have been recalled, or the vendors made aware of the issue so that they could be inspected before they're sold. By 1913 it was the other way around. Holley 12-804 Holley Fuel Pressure Regulators JEGS 41040 JEGS Fuel Pressure Gauges Now you need fittings. Holley(R) has been the undisputed leader in fuel systems for over 100 years. I had a chrome dial regulator, which leaked gas everywhere but luckily didn't actually burn down my ride. We tend to speak of pressure as higher or lower than atmospheric however it is a relative measure and pressure applies under all conditions. TURNING THE ADJUSTMENT SCREW ALL THE WAY IN WILL RESULT IN EXCESSIVE FUEL PRESSURE . Holley Bracket Secondary Adjusting Lever Kit Steel Gold Iridited Holley 4150. I look upon that effort with a heavy heart though, for I have been religious about keeping the old car original as possible. Exclusive, high-quality Global Featured Holley Transmission Kickdown wrapped around the fuel lines. Can anyone speak to the validity of this or is anyone currently using an additive for this? When I got it to down to 30 - then the 0-15 psi reg would not hold anymore and climbed to 15 flooding out the engine. Reviewed in the United States on June 20, 2021. For more information go to www.P65Warnings.ca.gov, WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov, WARNING: This product can expose you to chemicals including 1,1,1,2-Tetrachloroethane which is known to the State of California to cause cancer. If so how? Too much anti-freeze - (typically ethylene glycol) causes the opposite effect even under pressure of the cooling system. There is supposed to a marking on the spring with the correct color, red or gold if it is the low pressure spring. What Rusty writes IS correct. For cars that require 4.5 to 9 PSI, the Holley 12-803 is the right model. To ensure this condition, the installation of a Holley 12-810 oil pressure safety switch is recommended I do not think we hi-jacked the thread - the article is not even available anymore online to read. For more information go to www.P65Warnings.ca.gov. It makes no discernible difference to power but if the conditions are sufficiently adverse it will still vapour lock and then you just have to wait until it cools. If I wait a hour for the system to cool to ambient temperature then it starts easy. Copyright 1995-2021 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. No issues. Thus the "lowest boiling point are the cause of vapour lock" is also NOT CORRECT thinking. 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. (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 . Pre-set at 2.8 PSI LASTLY on your first issue of understanding vapor lock and boiling point. There was a problem adding this item to Cart. One needs to have studied Chemistry as I have to actually know how this works. A long time ago it was in use in the oil business. Features: Adjustable fuel regulation from 1 to 4 psi .220" (7/32") restriction 3/8" NPT ports ( 1 in, 2 out) Chrome finish Mounting bracket included Pre-set at 2.8 PSI About Holley Holley 12-807 Fuel Pressure Regulator Diaphragm Repair Kit Why does this occur only under increased pressure? http://www.frontieroil.com/attachments/contentmanagers/106/PrdctsSpec_UnleadGasSpecs.pdf. Adjusting Holley Fuel Pressure Regulator? | Hot Rod Forum I have a holley low pressure reg. Octane is an actual chemical which would be at the light end of the scale for gas, kerosene would be at the heavy end. I adjust it up to 2.5 pounds and clean my hands. It seemed to work fine for a while after I dialed it into 2psi at idle, but now it reads 6psi and it won't adjust down to 3psi. The '54 Bentley already has an electric SU pump back near the tank, and it's low pressure output is just about right for the two SU H6 type carbs. What you write in post 12 is NOT correct. 2023 Holley Performance Products, Inc. All Rights Reserved. 12-804 Part Type: Fuel Pressure Regulators Product Line: Holley Fuel Pressure Regulators Summit Racing Part Number: HLY-12-804 UPC: 090127020234 Regulator Pressure (psi): 1-4 Regulator Style: Non-return Regulator Location: Inline Boost/Vacuum Reference Port: No Gauge Port: No Inlet Quantity: 1 Regulator Inlet Size: 3/8 in. Once the fuel fills up the float bowls in the carburetor and the needles and seats shut, it starts to build pressure, pushing the diaphragm against the adjustment spring under the adjustment screw and allowing the ball to go "up" against the seat, effectively shutting off fuel flow to the carb. Easy to read. Thanks to all contributors, particularly the information from Rusty, Bob and David. PDF ELECTRIC FUEL PUMPS P/N 12-801-1, 712-801-1, 12-802-1, 712-802 - Holley In those days before 1905 kerosene had a strong piercing odor and coal oil lamps sometimes exploded. IMCT is found in the paint isle of any hardware or home improvement store usually in quart or gallon cans. We will have the previous answer corrected. neglect, accident, improper installation or adjustment, dirt or other contaminants, water, corrosion or faulty repair, or used in applications other than . 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. The thinner, lighter products are at the light end of the scale the thicker heavier products are at heavy end. It looks like WhatsApp is not installed on your phone. I recently fitted an electric fuel pump to one of the cars. Chemistry does NOT work that way - just like adding more any one ingredient to a cake mix will make the cake better. Just open the hood and let things cool. $5 Off Your $100 Mobile App Purchase . I'm still looking for the reg in this pic. 1996-2023, Amazon.com, Inc. or its affiliates, Select a location to see product availability, Holley HOL 12-804 12-804 Fuel Pressure Regulator. [endif]-->. Conversely if you go too high and it knocks - you can bring it down with kerosene or the paint thinner family. Carb Part, 14 PSI Fuel Pressure Regulator Set 3/8in NPT Port 12804 . I feel I am 95% there, and a slight improvement would be all I need - for now, that is unless the ethanal mix changes (your tax dollars at work). Holley 12-804 1-4 Psi Carbureted Two Port Fuel Pressure Regulator As Raywith pointed out, you need to let the pressure go somewhere. Holley 12-804 low pressure regulator, Weber, jeep etc. IMCT is a "new product" from Klean-Strip they call "Industrial Maintenance Coating Thinner" that provides good solvency and can be used in place of MEK, Toluene, Xylene and VM&P Naphtha for thinning Industrial Maintenance Coatings.

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