";s:4:"text";s:23748:"Holley HOL 12-804 12-804 Fuel Pressure Regulator; ; Customer reviews . 3/8 Inch NPT Ports 1 Inch 2 Out. I do wish there were some stamped values on the adjustment screw like other models I have seen. Join Date: Nov 2007 Posts: 22035 Share Tweet #2 It is no different than mixing water with ethylene glycol to make what we call anti freeze or with methanol to make windshield washer fluid - you get a completely different product - it is not just water any more; and nor can you separate them back into their original separate entities - so you cannot think of them that way any more either. 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. readings of the carb. By 1913 it was the other way around. A: THESE INSTRUCTIONS MUST BE READ AND FULLY UNDERSTOOD BEFORE BEGINNING THE . It is an experimental thing and MORE IS NOT BETTER - less is better until you find the happy medium based the fuel you buy or have in the tank already. When it does light - the flame spread is faster but not so fast as to "knock" or be a violent explosive hard burn of the fuel. Can anyone speak to the validity of this or is anyone currently using an additive for this? Turn the screw out to lower the pressure. . The 12-804 is made from durable aluminum and has a satin chrome finish that is extremely resilient to corrosion and abrasive chemicals. I put it . Two 3/8" nipples/hose connections and a 3/8" to 1/8" reducer. Never tried it with my old Model A Ford but I heard that they will actually run on Kerosene.. This item cannot be shipped to your selected delivery location. I installed this on my Onan 7000 generator as part of a project to resolve vapor lock issues in hot weather and high altitudes. These cars have the carburettor mounted in "V" of the engine with exhaust manifolds running along each side of the carburettor which combined with under hood engine heat makes these cars very susceptible to vapor lock. The Holley Fuel Pressure Regulator (Part No. Can you adjust the fuel pressure? ${cardName} not available for the seller you chose. I appreciate it!! Your question might be answered by sellers, manufacturers, or customers who bought this product. 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. Open the unit and check the spring color, Reviewed in the United States on April 9, 2018. Street/Strip Carbureted Applications I will be fitting a pressure regulator, it can only help and will have to wait for the next vapor lock to occur to see if it overcomes the flooding. Much of the excess engine heat will end up soaking the fuel system under the hood. Going to check my VW bus fuel pump pressure. I've had some luck using LeadMax2000 but it's not a 100% cure. 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. In fact I can completely remove the adjusting screw and it still does not go down to 3psi. I still think they sent you the high pressure one. Just open the hood and let things cool. Is it a product that would be sold by a panel beater's supply shop? Holley Performance Products has been the undisputed leader in fuel systems for over 100 years. If youre looking to dial it in accurately its not going to do it. To avoid extra back pressure on the pump, and to keep cool fuel flow past the lowest pressure point in the fuel system; a by-pass line should be used and it should NOT "dead head" to the carburetor - that is put the return line as close to the carburetor inlet as possible. Holley part number for the kit is 12-807; Summit sells it for about $6. There are two kinds and they look the same. Holley 804 fuel pressure regulator install - YouTube 0:00 / 5:58 Holley 804 fuel pressure regulator install Schnebs Garage 2.42K subscribers Join Subscribe 72 Share Save 15K views 3 years ago. Easier said than done - especially without a "chemistry set", OD says a simple high school chemistry experiment will show this - BUT I said the boiling points will appear the same under STP (Standard Temperature and Pressure - which is one atmosphere of pressure at 77 degrees F - commonly room temperature ) - BUT under pressure in a fuel line the boiling point (vapor point) will be raised enough to prevent vapor lock at higher temperatures. That's where the pressure was going. Had to reset to Zero. It is a measure, as I understand it, of how readily the fuel will evaporate in open air. I like the attached simple explanation of the issue. Find an Automotive Service Professional For the best experience please upgrade or visit the site on another browser. Though I once has it working with only two 0-140 regulators, and since I had messed with the 0-140 regulator on the carb feed side trying to get it to work previously - it popped up to 50 psi - but the 15 psi reg held at 9 psi to the carb - for about 5 minutes, until I tried to reduce the 0-140 below 50 psi. Some Holley 12-803 4.5-9 psi and 12-804 1-4 psi regulators mislabeled from factory. The point being here - you need enough steady high enough pressure on the ball to allow it to regulate down reliably too. Unfortunately, these FPR are now made in Korea and they no longer include an alternate spring. 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. We currently do not have an estimate when this item will ship. I mix Industrial Maintenance Coating Thinner (IMCT) around 1 oz per gallon - which is basically a blend of petroleum distillate in the paint thinner / mineral spirits (once called also "white gas") family and ethyl acetate and not only does it cure vapor lock it increases octane because you can feel it in the power and acceleration. So this thread has been a great find for me particularly at this time. So they started putting more of the low grade gas, or high grade kerosene into the gas. I have heard true lead (LeadMax2000 or simillar) may do this as well? WARNING! I got all of my supplies in the Home Depot fittings section. Copyright 2008-2023 OReilly The summer gasoline vaporizes in the line and the heat soak is quicker and longer on hot day's. Shop Fuel Pressure Regulators at Summit Racing. This ensures that it's set too low. Use with standard pump only -not recommended for maximum pressure pumps. . All Holley regulators are pre-set at the factory at 2.8 PSI so there is no guesswork when first installing the regulator. LOW PRESSURE REGULATOR 12-804 quantity. 1996-2023, Amazon.com, Inc. or its affiliates, Select a location to see product availability, Holley HOL 12-804 12-804 Fuel Pressure Regulator.