bowls after each run, just to see exactly at what temperature the problems become apparent. If I could get 75-85 octane, non-ethanol, Regular gasoline that vaporized at above 180 deg F, I think my car would run fine all the time. Otherwise it's good. One must understand the chemical reactions and interactions of blending other hydrocarbons into what we call gasoline and then still have it able to have the same properties desired of the product called gasoline. Sorry, you're using a web browser that is no longer supported. If youre looking to dial it in accurately its not going to do it. Chemistry does NOT work that way - just like adding more any one ingredient to a cake mix will make the cake better. 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. As the car is parked Temperature. Shopping Cart Point and secure it into a clean container Inlet pressure of 7 psi limitation means your pump can not put out more than 7 psi to the regulator for it to properly operate. Quick & Hassle Free. Kerosene diesel fuel or stove oil will work. Just open the hood and let things cool. Please make sure that you are posting in the form of a question. 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. A quart of diesel added to the gas tank solves the problem without any more in side effects than a slight smell from the exhaust. You could arrange them on a scale from naptha gas, gasoline, kerosene, stove oil, diesel fuel, light lubricating oil, heavy lubricating oil, grease, asphalt. Reid Vapor Pressure (RVP) is a commonly used indicator of gasoline volatility. Full content visible, double tap to read brief content. I have used up to 20% kerosene with no discernible change and have spoken to people who told me that years ago on farms these old cars would run fine if started on gasoline then switched to 100% kerosene. If you put in too much you can return the fuel to some "kick" without knock with a small amount of acetone. Purchased the regulator from Baxter, unit arrived in 4 days.. To see our price, add these items to your cart. Too much fuel pressure for a given needle and seat assembly can overload the needle and seat and may cause flooding or drivability problems. For now, in 70 degrees ambient, the bowls are 100 F. at shut-down and after 15 minutes they rise to 115 F. At these temperatures the engine starts back up fine, but I believe another ten degrees will be in the problem zone. The project involved installing a 250LPH electric fuel pump on a relay system and then T off to a bypass line and a fuel pressure regulator on the fuel line going to the generator. The regulator that was shipped to me has an internal spring from a different model of regulator, the spring should be red. $59.69 . P/N 12-803, 12-501, 12-804, 12-500, & 15812NOS Installation Instructions WARNING! Your question might be answered by sellers, manufacturers, or customers who bought this product. 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. Part Number: HLY-12-803. The first opportunity to try it occurred recently. if you were packing them in boxes they would look identical. The Holley 12-804 fuel pressure regulator features 3/8" NPT in/out ports. ***The inlet pressure limitation is 7 psi. 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. The issue is simple that one is seeking to "re-blend" their own gasoline from one already sold. 4.9. 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. We work hard to protect your security and privacy. Holley 12-804 1-4 Psi Carbureted Two Port Fuel Pressure Regulator: Item #: HLY12-804 : Quantity: Price: $53.99 Add to cart . None of these contain lead and so should not damage a catalytic converter if you have one, HOWEVER too much IMCT will prolong the burn and may result in unburnt - STILL burning HOT gas being exhausted in the exhaust cycle. Adjustable Fuel Regulation From 1 To 4 PSI .220 Inch 7/32 Inch Restriction. '92 Ford Mustang GT: 385"/6.3L SBF, Dart SHP 8.2 block, forged steel crankshaft & H-beam rods, forged pistons, Trick Flow Twisted Wedge . 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 had a chrome dial regulator, which leaked gas everywhere but luckily didn't actually burn down my ride. Then I got this good one, to try to get 1.5 PSI to the Kadrons. The Holley 12-840 fuel pressure regulator features 3/8" NPT in/out ports. We are sorry. If yes what size should I, A: Amazon has encountered an error. So if you're looking for a FPR to get 1-4 psi, then the 12-804 is no longer your best choice. Holley recommends applying PTFE paste to the NPT thread of the fittings before installation on these applications. . Refining of oil is basically heating it into vapors and then capturing those vapors various degrees of cooling - at the top is "propane" - at the bottom is "pitch" or "road or roof tar". You may receive a partial or no refund on used, damaged or materially different returns. However the part number on the box was 12-804 which should be a 1-4 psi regulator BUT the Part number etched on the unit was 12-804 4.5-9 psi which doesnt exist. When it burns however, it is an eye and throat irritant, even though it raises octane, burns hotter, easier, and cleaner. 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. Call 800.979.0122, 7am-10pm, everyday. I have a holley low pressure reg. store #2. 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. In some areas, according to the map, RVP can vary from about 7.0 to 9.0 in some of the fuels. f9vxY"IpBQ? A long time ago it was in use in the oil business. In fact I can completely remove the adjusting screw and it still does not go down to 3psi. This product is intended only for the thinning of industrial maintenance coatings. So with that vapor fueling system - you are stuck "downgrading it" to a lower quality fuel. So, I take the reg apart to see if it is all clean and looks good. Some can be used for either - or. Octane is an actual chemical which would be at the light end of the scale for gas, kerosene would be at the heavy end. Holley 12-804 Carburetor Fuel Pressure Regulator 1 To 4 PSI Bottom Is Inlet Sides Are Outlets for a sandrail, rock Crawler, KOH, Ultra4, truck, UTV, side-by-side, dune buggy, mini buggy, manx, king of the hammers, 4x4, or Jeep. For the best experience please upgrade or visit the site on another browser. Yes. 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. . $41.19. Keep in mind that when there is pressure in the line, backing off on the adjustment isn't going to make the pressure go down. . There are two kinds and they look the same. HWYoF~Ta77[Z4"bG K=yK As an example water would boil and thus "vapor lock" at a really low temperature without ethylene glycol. I recently fitted an electric fuel pump to one of the cars. 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. 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. TURNING THE ADJUSTMENT SCREW ALL THE WAY IN WILL RESULT IN EXCESSIVE FUEL PRESSURE . 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. 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 do not have a pressure regulating valve to reduce the pressure from the pump but it works fine with no flooding under normal conditions and I have fitted a modern soft seat to the float cut off needle. Auto Parts v 6c02f45cd (2fvgn) cv1440. For cars that require 4.5 to 9 PSI, the Holley 12-803 is the right model. This item: Holley HOL 12-886 Regulator $13129 MEASUREMAN 1-1/2" Dial Size, 304 Stainless Steel case, Liquid Filled Fuel Pressure Gauge, 0-100Psi, 3-2-3%, 1/8"NPT Center Back Mount $2597 Moroso 65380 Fuel Line Fitting $1701 Total price: $174.27 Add all three to Cart Some of these items ship sooner than the others. Now, Holley EFI is dominating the performance world as well as our products for GM's LS engine. I will be trying one of these but am curious what is the active ingredient(s). Holley fuel pressure regulators are designed to precisely control the fuel pressure from the fuel pump to the carburetor. ). All kinds of remedies were tried. We will have the previous answer corrected. if you run a holley blue pump it is set at 14psi from the factory and you must run the regulator that came with the pump . Find an Automotive Service Professional 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. 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. A larger tank might need two quarts. Troubleshooting Carburetor Problems and Vaporlock Blues Revisited - Hagerty Lifestyle. 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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 I have largely eliminated this problem with all fuel system components rebuilt, and an electric fuel pump but will get occasional stumble with a hot (after say, an hour run) engine idling or in traffic if it is say, 80 or hotter out. Too much anti-freeze - (typically ethylene glycol) causes the opposite effect even under pressure of the cooling system. If I wait a hour for the system to cool to ambient temperature then it starts easy. Gauge looks small..it is not. Sign up for a new account in our community. Works and does the job. Holley low pressure reg woes #12-804. Easy to read. I have a electric pump at the tank to try and speed up the fuel cooling process but if you have a 100 deg F day you may have fuel near 100 deg F in the tank. Some Holley 12-803 4.5-9 psi and 12-804 1-4 psi regulators mislabeled from factory. 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. To add the following enhancements to your purchase, choose a different seller. 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. There is supposed to a marking on the spring with the correct color, red or gold if it is the low pressure spring. I'm suggesting to raise the boiling point by adding heavier or oilier substances such as kerosene. All Holley regulators are pre-set at the factory so there is no guesswork when first installing the regulator. Steve_Mack_CT I had hoped that the cooler fuel from the electric pump would solve the problem but it did not. The intent being to get "cool" fuel to the carburettor bypassing the areas where the system heats the fuel. Does it come with the hose fittings or to be bought separately? 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. Will changing the orientation change the preset pressure setting (checkball falling instead of raising)? Did not like having to reset to zerobut I did. Gasoline vaporizes according to fuel system pressure. I recall when Texaco used to advertise their "customized for your area" gasoline, in the earlier 1960s. I have adjusted a 6-9 lbs pump down. $5 Off Your $100 Mobile App Purchase . This will keep your pressure steady and have instant pressure change when adjusting. It's a diaphram with a spring. [endif]-->,