Driving on a warm day in heavy stop start traffic it started vapor locking on a climb - using 10% ethanol fuel with no additive . 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. Recommended Parts. . Most certainly it will be my plan to fully explore the possibility of "treating the Fuel", with hopes that diesel fuel will make just enough difference to avoid any re-engineering. It will meet your needs and deliver great quality at an affordable cost. This Holley universal low pressurefuel regulator is factory-setto 2.7 PSI, but is fully adjustablefrom 1 to 4 PSI. Does this need to be mounted upright or is it ok on its side? Vapor lock is caused by usually a fuel that vaporizes too easily at too low a pressure (in the line) due to under-hood heat and not enough pressure on it - which would run great if it could make it to the combustion chamber first. Brands like MSD, Flowmaster, Hurst, Accel and many more make up the offering of enthusiast-driven products to deliver robust, complete performance solutions for builders, racers, and drivers. Holley low pressure reg woes #12-804. The fuel pressure is at 1 - 3 psig since the pump is not running. Most certainly also, should that be successful, I will then experiment with IMCT as well. 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. 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. Amazon has encountered an error. I put it . te4cmCbGnt]&~`N@RPyBTa$=~fo:/T 92YE)3Uofo4Ou].-zowDt*ae^qf9z/?. Pre-set at 2.8 PSI In refining crude oil they distill it to separate out the different products. The Holley 12-804 fuel pressure regulator is adjustable from 1-4 psi. 12-804 : Quantity: Share : . (Maybe this arrangement was intentional to assist in vaporising the fuels of the day but it is all bad in hot weather with today's fuels). I am having problems understanding why you say OD is wrong and Rusty is correct, it seems to me you are all saying much the same and that is that gasoline is made up of many components each having different boiling points and the components with the lowest boiling point are the cause of vapour lock. Starting in 1970 leaded gas was taken off the market resulting in the gas we have today. This is the complex world of Chemistry - which is far too complex to go into here. The BP article does not address how to re-blend your own fuel, and indeed - each batch of gasoline - and even how long it has been sitting in a tank will change it's properties as certain things evaporate out of the fuel changing it's properties if in a vented tank. Its a bypass arrangement with non return valves to prevent reverse flow and is operated by a switch for use in event of vapor lock. Now my equipment sits idle while I wait for a response from the vendor. readings of the carb. By There is no "chemistry set" method to measure fuel vapor points. It needed a bit of adjusting for my purpose, but other than that, it performed perfectly. I look upon that effort with a heavy heart though, for I have been religious about keeping the old car original as possible. Interesting that the writer suggests certain additives can raise boiling point of gas in the first section. We work hard to protect your security and privacy. A larger tank might need two quarts. Holley HOL 12-804 12-804 Fuel Pressure Regulator Brand: Holley 436 ratings | 33 answered questions Amazon's Choice in Automotive Replacement Fuel Injection Pressure Regulators by Holley $4119 FREE Returns Adjustable fuel regulation from 1 to 4 psi .220" (7/32") restriction 3/8" NPT ports ( 1 in, 2 out) Mounting bracket included Pre-set at 2.8 PSI Chrome Finish. Note also that PURE ethylene glycol is also flammable but also miscible with water. . Among other places on the web - you will find a fairly good dissertation of the issue at => Evergreen Performance Systems, Inc. and Hydrogen Power Central | The true source for powering engines with Hydrogen - not "HHO". 4.25 out of 5 stars. Troubleshooting Carburetor Problems and Vaporlock Blues Revisited - Hagerty Lifestyle. . Each Holley fuel pressure regulator is fully adjustable so regulating the fuel pressure to your engines needs is a simple task. Adding heavier weight hydrocarbons WILL raise the vapor point under pressure - usually enough to keep the fuel from vaporizing in the line or boiling off in the carburetor bowl while flowing. Shop Fuel Pressure Regulators at Summit Racing. 12-804) is a Low Pressure (1-4 PSI) regulator. The pressure regulator works fine when mounted flat, but should work ok when mounted on it. Going to check my VW bus fuel pump pressure. 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. i'm trying to figure out why you are running a T when there are two outlets. This is another vexing problem with Ethanol mix, which is about all you can get here in CT. The peak was reached in the sixties when heavily leaded gas of over 100 octane was available. . The Holley Fuel Pressure Regulator (Part No. 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. Got a gauge on the FPR to monitor, and at first it was great. There is supposed to a marking on the spring with the correct color, red or gold if it is the low pressure spring. 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. Holley fuel pressure regulators are designed to precisely control the fuel pressure from the fuel pump to the carburetor. Adjustable from 1 to 4 PSI. But it is not the ethyl acetate alone that causes the effect to raise the vapor temperature point of fuel. Error posting question. Any thoughts on this? 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. I got all of my supplies in the Home Depot fittings section. bowls after each run, just to see exactly at what temperature the problems become apparent. Reviewed in the United States on April 2, 2022. The Holley 12-804 is a 1 to 4 range PSI regulator. Worked well out of the box. 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. Can you adjust the fuel pressure? Holley Carburetor Fuel Pressure Regulator 1 To 4 Psi Bottom Inlet Sides Are Outlets from Pacific Customs Unlimited your best source for Street, Off Road, Sandrail, Dune Buggy, Manx, Rock Crawler, Volksrod, or Mud Buggy VW Parts. Bobburns thank you for the confirmation and technical explanation. Wont be good for a finicky carb. Vapor lock was just a fact of life for the Fords. Like many others, I have been considering what to do recently. 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 . 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 So they started putting more of the low grade gas, or high grade kerosene into the gas. I suspect as the article suggests even with all these steps you can still get the crap gas to boil if it is hot enough under the hood. You'll find they both have the same initial boiling point - been there and done it. 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). No issues. If you have it plumbed up "dead headed", lowering the pressure might not react very quickly. Two Port There is clearance around the needle which I would have thought would be enough to vent the increased pressure but maybe not. You may receive a partial or no refund on used, damaged or materially different returns. What we call gasoline - as Rusty showed; is blended today - and the various chemicals blended into it for the various regions and state laws make it a special product where you BUY it. He asked about issues and thoughts of what causes vapor lock, so it is just answered in more detail and suggested solutions on how to fix vapor lock. The point is the 0-140 regulators (they are all coming out of China now-a-days) will not regulate lower than about 20 reliably so you need a staged system - and even Holley says so on the 803BP design set up. Then I got this good one, to try to get 1.5 PSI to the Kadrons. December - February gas mixture begins to vaporize at 11-15psi at 105 deg F, April gasoline is 9-11.5 psi at 124 deg F. If you had winter gasoline in your Antique car on a 100 deg day you would only be about 5 degrees from vapor bubbles in the fuel. This will ensure that the pump will not continue to operate after the engine is . Some of these items ship sooner than the others. Mr. Gasket 1561 Fuel Pressure Gauge 1.500 in. 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. [endif]--> http://www.bp.com/liveassets/bp_internet/retail/retail_australia/STAGING/local_assets/downloads_pdfs/f/FN_modern_petro_vintage_engines.pdf, . There are two kinds and they look the same. 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. Holley Manufacturer Part Number 12-804 Manufacturer Holley Assembled Product Dimensions (L x W x H) 3.50 x 3.50 x 2.50 Inches Warranty Warranty information 90 DAY REPLACEMENT IF DEFECTIVE Warnings Warning Text proposition 65 reasons:titanium dioxide, other chemicals WARNING - California Proposition 65 None Report incorrect product information The reliable, albiet slower, stovebolts never suffered vapor lock because the fuel pump and lines were up front in the airstream of the engine fan. wrapped around the fuel lines. (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. At first it seemed fine, set it to 1.5 PSI and away we go. 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. 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. Q: The lower I can get with this pressure is 3.5 psi (at max adjustment). Never had it act up while running, but since E10 fuel came along it is borderline getting started after hot shutdowns. Then I got this good one, to try to get 1.5 PSI to the Kadrons. We encountered an error while updating this page. Unfortunately, these FPR are now made in Korea and they no longer include an alternate spring. [endif]-->,