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. For over a century Holley has driven the cutting edge of fuel-system design. Also I fitted a modern soft seat to the carburettor to assist in shutting off the higher pressure from the pump - the original shut off is a brass tapered needle on a brass seat. Accurate description. Fuel pressure regulators are used to adjust for fuel pressure requirements of various carburetors. On occasions here in NZ, we get extreme heat and old cars vaporlock. Please try again later. Needs you to make/tap your own threads for screws, Reviewed in the United States on February 4, 2023. Will changing the orientation change the preset pressure setting (checkball falling instead of raising)? Yes. Chrome Finish. $5 Off Your $100 Mobile App Purchase . Great feedback from a knowledgeable group, guys! 3/8Inch Npt Ports 1 Inch 2 Out. te4cmCbGnt]&~`N@RPyBTa$=~fo:/T 92YE)3Uofo4Ou].-zowDt*ae^qf9z/?. P/N 12-803, 12-803BP, & 12-804 Installation Instructions 199R7914-3 NOTE: 12-803BP IS NOT TO BE USED WITH MECHANICAL FUEL PUMPS! This product is made of high-quality materials to serve you for years to come. You may receive a partial or no refund on used, damaged or materially different returns. Reviewed in the United States on June 5, 2022. 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). . I have the one I have set up in a deadhead setup. None of them worked. Some parts are not legal for use in California or other states with similar regulations. However I would welcome you advice on the following. (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). So in an open cup the boiling points would also appear the same as water but under pressure the boiling point is different. 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. As an example water would boil and thus "vapor lock" at a really low temperature without ethylene glycol. Click here to find a I have adjusted a 6-9 lbs pump down. 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LASTLY on your first issue of understanding vapor lock and boiling point. It is as said - of the "paint thinner" family in weight with ehtyl acetate blended in to make it's solvency properties a little "hotter " and stronger. It was about this time that car makers lowered the compression ratios, went to long stroke motors, and developed hot spots and vaporizers on their intakes to burn the new low grade or low octane gas. If your having pressure controll issues with the Holley regulators you can eliminate most problems with stability by installing a by pass line back to the tank and usualy a street car can use 1/8 copper. CBPN804A Swinging Drawbar Pin Kit Ford NAA 501 600 700 800 900 2000 3000 4000. Neither the Holley instructions nor anywhere I can find says what the maximum inlet PSI should be allowed to the regulator - but I was told it was 16 psi and one other spot on the web says something similar. 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. For more information go to www.P65Warnings.ca.gov/passenger-vehicle, WARNING: This product can expose you to chemicals including Styrene which is known to the State of California to cause cancer. Some cars are much more apparent to vapor locking than others, I"ve never experienced here in NJ with either of my older Packards which see all kind of hot summer driving conditions. Google ethyl acetate and pay attention to it's "pure" boiling point, and remember IMCT is a blend of a white gas family of a petroleum distillate and ethyl acetate. To minimize exposure, avoid breathing exhaust, do not idle the engine except as necessary, service your vehicle in a well-ventilated area and wear gloves or wash your hands frequently when servicing your vehicle. The Holley 12-804 fuel pressure regulator features 3/8" NPT in/out ports. . As Raywith pointed out, you need to let the pressure go somewhere. The two will be very close to the same just as would Water and Anti-Freeze boiled in an open pot. Sign up for a new account in our community. Profile Page . 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. 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. 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. Error posting question. Check the status of your 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. . The Holley 12-804 is one of the most popular low fuel pressure regulators that works perfectly for setups that require 1 to 4 PSI. ${cardName} unavailable for quantities greater than ${maxQuantity}. Any of these heavier than gasoline petroleum distillates above will raise the vapor point of gasoline if mixed into it. Mr. Gasket 1561 Fuel Pressure Gauge 1.500 in. Driving on a warm day in heavy stop start traffic it started vapor locking on a climb - using 10% ethanol fuel with no additive . ***The inlet pressure limitation is 7 psi. Plain WATER has great cooling properties, but under pressure will boil at a lower temperature than anti-freeze mixed with water - up to a certain point. . use a 1/16 - 1/8" restrictor in the end of your fuel line to see if you can set the pressure then. Shopping Cart Quadrajets should have 6 to 9 at the inlet or they flood past the needle seats. This satin finish regulator feature 3/8 pipe thread . 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. There's always a catch with bargains, Reviewed in the United States on July 9, 2022. I cannot help you - and no one can without knowing the exact make up of the gasoline being refined where you are. Features: Adjustable from 4.5-9 psi for precise fuel pressure adjustments Constructed of billet aluminum with a black anodized base and clear anodize top for good looks Used in systems where a return line is not needed Use with electric or mechanical pumps
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