How to adjust Holley regulator? | Team Chevelle To ensure this condition, the installation of a Holley 12-810 oil pressure safety switch is recommended Holley Bracket Secondary Adjusting Lever Kit Steel Gold Iridited Holley 4150. Will changing the orientation change the preset pressure setting (checkball falling instead of raising)? 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. . Holley 12-804 Chrome Carbureted Fuel Pressure Regulator Joined: Apr 7, 2008 Posts: 1,727. Everything does just fine, until temperatures rise above 80 degrees or so, as they are soon to do. Somewhat of an inconvenience but that's why it's probably cheaper than other places selling the same part Great product from holley, but these do not come with the supplied tap that's suppose to be in box for the 2 machine screws that mount the regulator to the bracket. The chemistry class experiment you are referring to will yield the approximate boiling (vapor) point at STP - Standard Temperature and Pressure ONLY. Gasoline at the pump is a blend of different chemicals. Steve_Mack_CT http://www.jalopyjournal.com/forum/showthread.php?t=386155, Kingman, Arizona - The place on the way to other p, http://www.holley.com/types/Fuel%20Pressure%20Regulators%20-%20Carbureted.asp, (You must log in or sign up to reply here. . 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. There was a problem adding this item to Cart. Rich boys replaced their 216 stovebolt 6's with GMC 270 or 302 sixes with a performance "full race" cam. Rusty said any heavier hydrocarbon WILL raise the boiling point - and I said Rusty is correct and OD is wrong. As an example water would boil and thus "vapor lock" at a really low temperature without ethylene glycol. In refining crude oil they distill it to separate out the different products. 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. PDF Holley Billet Fuel Pressure Regulators P/N 12-841, 12-842, 12-845, 12 The issue is simple that one is seeking to "re-blend" their own gasoline from one already sold. For over a century Holley has driven the cutting edge of fuel-system design. I think we have hijacked Steve's thread where he asked the question about raising the boiling point of gas which hopefully has been fully answered by these side issues. The reg takes 3/8" fittings and the gauge takes 1/8" fittings. . The Holley 12-804 fuel pressure regulator features 3/8" NPT in/out ports. . It is no different than mixing water with ethylene glycol to make what we call anti freeze or with methanol to make windshield washer fluid - you get a completely different product - it is not just water any more; and nor can you separate them back into their original separate entities - so you cannot think of them that way any more either. Prewar cars have very low compression and will run better on gas that has some kerosene added. Please try again later. 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). Conversely if you go too high and it knocks - you can bring it down with kerosene or the paint thinner family. This part is Backordered. I recently fitted an electric fuel pump to one of the cars. Then, we got what was loosely described as winter gas, all year round, with RFG. Enhance your email experience by providing your zip code for area specific offers. fuel pressure problem - holley blue pump & reg | Hot Rod Forum $41.19. That's not to say that adding something like kersene won't help, but it can't eliminate the volatile components. Holley 12-804 Adjustable Fuel Pressure Regulator, 1-4 PSI - Speedway Motors As the car is parked Temperature. Depending on what kind of electric fuel pump you used you will need a regulator - or series of regulators to step down the pressure getting to the carburetor like a Holley 12-803 type at the very least. 03-28-2012, 03:04 AM. Holley Fuel Pressure Regulator Rebuild 12-804 - YouTube . Chemistry does NOT work that way - just like adding more any one ingredient to a cake mix will make the cake better. 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 Some can be used for either - or. 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. Reviewed in the United States on January 15, 2021. To see our price, add these items to your cart. Holley 12-804 Carburetor Fuel Pressure Regulator 1 To 4 PSI - Kartek . (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. Holley Fuel Pressure Regulator 12-804 | O'Reilly Auto Parts Hi Bob, I can get a hold of some 99.7% pure ethyl acetate cheap. NOTE: P/Ns 12-841, 12-842, & 12-879 utilize 3/8" NPT inlets and outlets. If you have it plumbed up "dead headed", lowering the pressure might not react very quickly. Holley 12-807 Fuel Pressure Regulator Diaphragm Repair Kit The regulator that was shipped to me has an internal spring from a different model of regulator, the spring should be red. Too much fuel pressure for a given needle and seat assembly can overload the needle and seat and may cause flooding or drivability problems. With this set up, pressures throughout system varies only very slightly from atmospheric, lower up to the vacuum tank and higher in the gravity feed from the vacuum tank to the carburettor. 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.Regulatorhas a 3/8" NPT tapped fuel pressure gauge port and requires reducer 617-6157 to install the gauge. A vapor lock condition would be caused. Loosening the regulator locknut and turning the adjustment screw clockwise increases the pressure. Did not like having to reset to zerobut I did. The ethyl acetate in the IMCT loosens hydrogen bonds on the gasoline making it easier to light to burn, but the "oil" - heavier hydro-carbon nature keeps the vapor point higher and flash point still low enough to give good performance. $59.69 . My car runs and idles fine with no flooding when running with the electric pump, the flooding only occurred once when it vapor locked. The BP article explains causes - not how to change fuel formulations - so for this discussion it explains nothing. I prefer to keep things simple but I appreciate the more correct technical approach. Holley 12 803 instructions - United States manuals Step-by-step Tutorials As you can see from what it replaces - it is "hot" solvent - but not quite as hot as acetone in its ability to dissolve other things. 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. Driving on a warm day in heavy stop start traffic it started vapor locking on a climb - using 10% ethanol fuel with no additive . In the fuel use map in the Exxon or Mobil gasoline websites, there are a few places where the Reid Vapor Pressure spec is varied from other fuels. 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. Easy to read. In some areas, according to the map, RVP can vary from about 7.0 to 9.0 in some of the fuels. This Holley universal low pressurefuel regulator is factory-setto 2.7 PSI, but is fully adjustablefrom 1 to 4 PSI. For the best experience please upgrade or visit the site on another browser. Works, don't use a liquid filled gauge in an engine compartment! Holley 12-804 Holley Fuel Pressure Regulators JEGS 41040 JEGS Fuel Pressure Gauges Now you need fittings. '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 . . Use with standard pump only -not recommended for maximum pressure pumps. You set it to the exact fuel pressure you want. 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. Great feedback from a knowledgeable group, guys! Holley 12-803 Fuel Pressure Regulator - The BangShift.com Forums Open the unit and check the spring color, Reviewed in the United States on April 9, 2018. You refer to the problem of the additive increasing the propensity for the fuel to self ignite however in my case the compression ratio of the cars is so low (around 4 : 1) that I doubt that it would be a problem. I Have problems with the fuel temp in my 1937 Buick. Recommended Parts. Carb Part, 14 PSI Fuel Pressure Regulator Set 3/8in NPT Port 12804 for Holley : Amazon.com.au: Automotive I remember when I was a teen in the 50's and everyone had a flathead Ford V8 or a Chevy stovebolt 6. 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. One common problem is when you have an abnormally warm day in the winter, and the low vapor pressure gasoline in the car will vapor lock on that hot day. 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.