So in an open cup the boiling points would also appear the same as water but under pressure the boiling point is different. (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 . Too much fuel pressure for a given needle and seat . It's easy! You may receive a partial or no refund on used, damaged or materially different returns. 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. Note also that PURE ethylene glycol is also flammable but also miscible with water. . 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. I will be trying one of these but am curious what is the active ingredient(s). (see reg-setp.pdf), This is the same design as a Holley 12-803 or 804 knock off, so I looked up Holley's instructions. 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. The following vehicles are considered Emissions Controlled Vehicles: *Free Shipping & Handling only offered to the contiguous US on orders over $100, excludes clearance parts and oversized packages. Does this need to be mounted upright or is it ok on its side? Thanks for the comments, I am aware of the need for a regulating valve to reduce the pump pressure and would have fitted one except that I was advised by the owner of an identical car to mine that his car does not flood using the same electric pump without a regulator, it is only a 2.5 -4 psi pump. use a 1/16 - 1/8" restrictor in the end of your fuel line to see if you can set the pressure then. There was a problem completing your request. From propelling the LS-, Coyote-, and Gen 3 Hemi-swap trends, to continuously innovating late-model and vintage vehicle performance, Holleys commitment to its customers and their cars is at the core of everything we do. f9vxY"IpBQ? Q: Contact Us - DO NOT EMAIL CAR QUESTIONS. The regulator is a Holley 12-804, I was told it went down to 1 psi and I have a stock mechanical fuel pump. At first it seemed fine, set it to 1.5 PSI and away we go. As Raywith pointed out, you need to let the pressure go somewhere. No issues. Spring clothes pins, aluminium foil, wet burlap, etc. 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. Rusty, thanks so much for this information. All Holley regulators are pre-set at the factory so there is no guesswork when first installing the regulator. I appreciate it!! Second, you adjust this regulator by turning the hex screw on top - does anyone happen to know how many pounds one or more full turns would produce etc? He finally achieved significant improvement by fitting a vent to the carburettor top (which is routed away and under the car for safety). $5 Off Your $100 Mobile App Purchase . HWYoF~Ta77[Z4"bG K=yK TURNING THE ADJUSTMENT SCREW ALL THE WAY IN WILL RESULT IN EXCESSIVE FUEL PRESSURE . 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. So they started putting more of the low grade gas, or high grade kerosene into the gas. . 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. Shopping Cart The regulator that was shipped to me has an internal spring from a different model of regulator, the spring should be red. . %PDF-1.4 I have the one I have set up in a deadhead setup. Rusty said any heavier hydrocarbon WILL raise the boiling point - and I said Rusty is correct and OD is wrong. 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. Works and does the job. $12.15: ac000400: Front Axle Beam Bushing Reamer For 1.34 Up To 1.50 Diameter . It works but not as well as some of the off brands like spectre. Find an Automotive Service Professional The Holley Fuel Pressure Regulator (Part No. Please try again later. Applications. Please try again later. Shiny Finish. So - you cannot just say whether it will work or not. We will have the previous answer corrected. The point being here - you need enough steady high enough pressure on the ball to allow it to regulate down reliably too. Two Port Holley part number for the kit is 12-807; Summit sells it for about $6. 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. . Open the unit and check the spring color, Reviewed in the United States on April 9, 2018. 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. I like the attached simple explanation of the issue. In fact I can completely remove the adjusting screw and it still does not go down to 3psi. Regards, Mike. . To keep it on simple terms, several people have confirmed that adding some kerosene, diesel fuel or stove oil will reduce the tendency to vapor lock and will NOT hurt an older model, low compression engine. What Rusty writes IS correct. One needs to have studied Chemistry as I have to actually know how this works. So this thread has been a great find for me particularly at this time. 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. Everything does just fine, until temperatures rise above 80 degrees or so, as they are soon to do. 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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. Unfortunately, these FPR are now made in Korea and they no longer include an alternate spring. 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. Rusty, if you can find a cooperative local high school chemistry class, take a small amount of gasoline, split it into 2 portions, add 5% or so kerosene to one half, and have them do a fractional distillation on both. Copyright 2023, Antique Automobile Club of America. Most certainly also, should that be successful, I will then experiment with IMCT as well. Post in the forum instead. 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. The carburettor was flooding, the electric pump was still running. If I wait a hour for the system to cool to ambient temperature then it starts easy. Holley fuel pressure regulators are designed to precisely control the fuel pressure from the fuel pump to the carburetor. For over a century Holley has driven the cutting edge of fuel-system design. The owner had tried all practical means to reduce the heat gain of the fuel system but with little improvement. Q: Overview. Daily newspaper from Sapulpa, Oklahoma that includes local, state, and national news along with advertising. Please try again. IMCT is found in the paint isle of any hardware or home improvement store usually in quart or gallon cans. . A vapor lock condition would be caused. Recommended Parts. 9517377223. This item cannot be shipped to your selected delivery location. Privacy Policy. ESPECIALLY a 10% ethanol blend - once generically called the gasohol summer blend in that vapor system would really be a problem. 1 oz per gallon - not more than 2 is usually in the right "goldie-locks" range. 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. 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. $59.69 . 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). 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. order 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. 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. Adding some additives can raise the AVERGE boiling point but cannot remove the lower-boiling components, so regardless of what higher ends are present, the initial boiling point will remain that of the most volatile components. 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 ${cardName} not available for the seller you chose. The 12-803 4.5-9 psi spring is plain, (just the gold colored plating) the spring is accessible and replacable The cheap dial units are terrible. Join Date: Nov 2007 Posts: 22035 Share Tweet #2 Reviewed in the United States on January 15, 2021. Reviewed in the United States on September 4, 2017. . Accurate description. Then I got this good one, to try to get 1.5 PSI to the Kadrons. CALIFORNIA WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov. Some can be used for either - or. 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 you were packing them in boxes they would look identical. 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. To ensure this condition, the installation of a Holley 12-810 oil pressure safety switch is recommended Use with standard pump only -not recommended for maximum pressure pumps. 3 0 obj <>stream loyalty program Much of the excess engine heat will end up soaking the fuel system under the hood. [endif]-->