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1 oz per gallon - not more than 2 is usually in the right "goldie-locks" range. What I would do, is with the car off, (or electric pump off), turn the screw a good ways out. 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 12-840 4.5-9 PSI Adjustable Billet Fuel Pressure Regulator with 3/8" NTP Ports,Black Anodized Brand: Holley 24 ratings | 11 answered questions $10902 & FREE Returns The package length is 9.652 centimeters The package height is 6.604 centimeters The package width is 9.144 centimeters Package Weight : 0.2 pounds See more product details Shop Fuel Pressure Regulators at Summit Racing. Holley 12-840 HP Billet Carbureted Fuel Pressure Regulator Holley 12-804 Fuel Pressure Regulator Brand: Holley 415 ratings -11% $6614 Was: $73.94 3/8" pipe thread ports 7/32" restriction Pressure ranges from 1 to 4 PSI Includes mounting bracket Satin finish See more product details + + Total price: $115.81 Add all three to Cart These items are shipped from and sold by different sellers. I feel lucky that this did not damage my generator because at one point I saw 30lbs of pressure while trying to start the generator. There was a problem adding this item to Cart. As the car is parked Temperature. Some can be used for either - or. Holley 12-804 fuel press regulator what pressure out of box? [endif]-->. 9 really is max. . Holley Carburetor Fuel Pressure Regulator 1 To 4 Psi Bottom Inlet Sides 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. 3/8 Inch NPT Ports 1 Inch 2 Out. on this design the adjusting screw all the way out should decrease the pressure the most - IF the ball valve will seat TIGHT, When I adjusted pressure below 30 - it would not seat any longer even with the adjustment screw all the way out. LASTLY on your first issue of understanding vapor lock and boiling point. 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. Check "Reid Vapor Pressure" in Wikipedia, or similar. They put everything they could into the coal oil including what we would consider low grade gasoline. Contact Us - DO NOT EMAIL CAR QUESTIONS. This went on until they developed the cracking process which allowed more flexibility in what they got out of the crude. Somewhat of an inconvenience but that's why it's probably cheaper than other places selling the same part number. 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. The other part numbers utilize an AN O-ring inlet, outlet, & return ports, and do not require any sealer on the threads. Find an Automotive Service Professional Now, Holley EFI is dominating the performance world as well as our products for GM's LS engine. We are sorry. 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. Holley 12-803 Two Port Chrome Fuel Pressure Regulator - 1-4 PSI. Unfortunately, these FPR are now made in Korea and they no longer include an alternate spring. For more information go to www.P65Warnings.ca.gov, WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov, WARNING: This product can expose you to chemicals including 1,1,1,2-Tetrachloroethane which is known to the State of California to cause cancer. Holley 12-804 Fuel Pressure Regulator Installation Instructions . Product very good. Our payment security system encrypts your information during transmission. Add to cart. Regards, Mike. I recall when Texaco used to advertise their "customized for your area" gasoline, in the earlier 1960s. Holley Fuel Pressure Regulator Rebuild 12-804 - YouTube 0:00 / 37:53 Holley Fuel Pressure Regulator Rebuild 12-804 DurocShark 309 subscribers Subscribe 10K views 3 years ago I walk through. FREE SHIPPING on most orders of $35+ & FREE PICKUP IN STORE. Today's fuel is made for high compression engines - and it has an intentionally lower vapor point, with a higher flash point and autoignition point. All Holley regulators are pre-set at the factory at 2.8 PSI so there is no guesswork when first installing the regulator. To see our price, add these items to your cart. Unfortunately, this fuel pressure regulator does not even come close to regulating the pressure and keeping the pressure down. So if you're looking for a FPR to get 1-4 psi, then the 12-804 is no longer your best choice. I had a chrome dial regulator, which leaked gas everywhere but luckily didn't actually burn down my ride. I have a holley low pressure reg. Easy to read. It seemed to work fine for a while after I dialed it into 2psi at idle, but now it reads 6psi and it won't adjust down to 3psi. Reid Vapor Pressure (RVP) is a commonly used indicator of gasoline volatility. Discussion in 'The Hokey Ass Message Board' started by striper, Aug 12, 2009. The two will be very close to the same just as would Water and Anti-Freeze boiled in an open pot. It's not the vendor's fault, these things should have been recalled, or the vendors made aware of the issue so that they could be inspected before they're sold. None of these contain lead and so should not damage a catalytic converter if you have one, HOWEVER too much IMCT will prolong the burn and may result in unburnt - STILL burning HOT gas being exhausted in the exhaust cycle. ;b DK%*DO[%A IPd?Q~]=n1)E1D*q`D fF-"4N3i4\1uOn(@%c0IHQg`~uKVf{/r0d2}XVXi1-tpE1K[T*3"IS0v27UfTajff`"(dJD0fFlvryT{?:VUusSqD?R$LlalK&@$8q'qbSEv finish) . 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 . 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. Any thoughts on this? Decrease pressure by turning the adjustment screw counter-clockwise. Sorry, we were unable to perform your search at this time. Fuel Pressure Regulator; Holley fuel pressure regulators are designed to precisely control the fuel pressure from the fuel pump to the carburetor. use a 1/16 - 1/8" restrictor in the end of your fuel line to see if you can set the pressure then. Amazon has encountered an error. Eligible for Return, Refund or Replacement within 30 days of receipt. You could arrange them on a scale from naptha gas, gasoline, kerosene, stove oil, diesel fuel, light lubricating oil, heavy lubricating oil, grease, asphalt. Volatility is a measure of the gasolines tendency to vaporize under a given set of conditions. Adjustable fuel regulation from 1 to 4 psi, 1965 and older U.S. manufactured California Certified vehicles, 1967 and older U.S. manufactured Federally Certified vehicles, 1967 and older Foreign manufactured vehicle, 1966 and newer U.S. manufactured California Certified vehicles, 1968 and newer U.S. manufactured Federally Certified vehicles, 1968 and newer Foreign manufactured vehicle. Show details 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. . . Check the status of your Can Boiling Point of Gas Be Raised? - Discussion Forums Worked well out of the box. There is supposed to a marking on the spring with the correct color, red or gold if it is the low pressure spring. So in an open cup the boiling points would also appear the same as water but under pressure the boiling point is different. Profile Page . near you Octane is an actual chemical which would be at the light end of the scale for gas, kerosene would be at the heavy end. Yes the light elements will still be in there. Reviewed in the United States on June 5, 2022. I got all of my supplies in the Home Depot fittings section. Copyright 2023, Antique Automobile Club of America. But the heavier elements will raise the boiling point of the mixture. September 21, 2010 in Technical. PDF Holley Billet Fuel Pressure Regulators P/N 12-841, 12-842, 12-845, 12 Adjustable fuel regulation from 1 to 4 psi, Holley 12-804 Reg, Fuel Press 1-4 Psi Pol. Holley 12-804 Carburetor Fuel Pressure Regulator 1 To 4 PSI - Kartek Once the fuel fills up the float bowls in the carburetor and the needles and seats shut, it starts to build pressure, pushing the diaphragm against the adjustment spring under the adjustment screw and allowing the ball to go "up" against the seat, effectively shutting off fuel flow to the carb. Holly Fuel pressure regulator install | Jeep Enthusiast Forums Needs you to make/tap your own threads for screws, Reviewed in the United States on February 4, 2023. Enhancements you chose aren't available for this seller. Pre-set at 2.8 PSI When it burns however, it is an eye and throat irritant, even though it raises octane, burns hotter, easier, and cleaner. The summer gasoline vaporizes in the line and the heat soak is quicker and longer on hot day's. PDF Holley 12-803BP Fuel Pressure Regulator Installation Instructions - JEGS neglect, accident, improper installation or adjustment, dirt or other contaminants, water, corrosion or faulty repair, or used in applications other than . I can start my car instantly after sitting in a cool garage at about 75 deg F. Drive 30 miles and then park for 20 minutes. The float has a needle that projects through the top of the carburettor so it is possible to see whether the float is "floating" or not. . The lower I can get with this pressure is 3.5 psi (at max adjustment). I put it . Q: You'll find they both have the same initial boiling point - been there and done it. Great feedback from a knowledgeable group, guys! It appears this one needs 40 to 50 minimum. fuel pressure problem - holley blue pump & reg | Hot Rod Forum The intent being to get "cool" fuel to the carburettor bypassing the areas where the system heats the fuel. The seller gratefully sent me a replacement part but the result was the same. Street/Strip Carbureted Applications I have just this Spring started taking temp. On occasions here in NZ, we get extreme heat and old cars vaporlock. 12-804 Part Type: Fuel Pressure Regulators Product Line: Holley Fuel Pressure Regulators Summit Racing Part Number: HLY-12-804 UPC: 090127020234 Regulator Pressure (psi): 1-4 Regulator Style: Non-return Regulator Location: Inline Boost/Vacuum Reference Port: No Gauge Port: No Inlet Quantity: 1 Regulator Inlet Size: 3/8 in. ${cardName} not available for the seller you chose. 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. Steve, gasoline isn't a single chemical compound but a mixture of hundreds of individual chemical compounds which have a large range of boiling points. 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. No issues. Works and does the job. So - you cannot just say whether it will work or not. The fuel pump and fuel line setting top center of the engine was not only in the hottest ambient temp, except for the exhaust manifolds, under the hood they acted as a heat sink transferring heat from the block to the air. That's where the pressure was going. I will be trying one of these but am curious what is the active ingredient(s). PDF ELECTRIC FUEL PUMPS P/N 12-801-1, 712-801-1, 12-802-1, 712-802 - Holley The peak was reached in the sixties when heavily leaded gas of over 100 octane was available. LOW PRESSURE REGULATOR 12-804 - Allstate Carburetor Please try again later. Reasonable . Each Holley fuel pressure regulator is fully adjustable so regulating the fuel pressure to your engines needs is a simple task. WARNING: Operating, servicing and maintaining a passenger vehicle or off-road vehicle can expose you to chemicals including engine exhaust, carbon monoxide, phthalates, and lead, which are known to the State of California to cause cancer and birth defects or other reproductive harm. ). Includes initial monthly payment and selected options. 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. They sold more gas than coal oil. 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. 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.