Turn the screw out to lower the pressure. ***The inlet pressure limitation is 7 psi. We encountered an error while updating this page. As Raywith pointed out, you need to let the pressure go somewhere. Holley 804 fuel pressure regulator install - YouTube 0:00 / 5:58 Holley 804 fuel pressure regulator install Schnebs Garage 2.42K subscribers Join Subscribe 72 Share Save 15K views 3 years ago. Might have been along the same lines as adding a quart of atf to the engine oil to help quiet noisy hydraulic valve lifters, or for "sludge clean-up" activities? Auto Parts v 6c02f45cd (2fvgn) cv1440. Does this mean that we are back to the situation described by OD where the lower boiling point additive reduces only the average boiling point? You would'nt just be reading the inlet pressure would you? Refining of oil is basically heating it into vapors and then capturing those vapors various degrees of cooling - at the top is "propane" - at the bottom is "pitch" or "road or roof tar". We currently do not have an estimate when this item will ship. THESE INSTRUCTIONS MUST BE READ AND FULLY UNDERSTOOD BEFORE BEGINNING THE . 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. NPT Inlet Attachment: #1 Holley 12-803 Fuel Pressure Regulator January 16, 2011, 11:41 AM Can it be mounted upside down (adjustment screw pointing down) and still work properly? Regards, Mike. 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. I would welcome your advice on this - with apologies for the length of this post. I will be trying one of these but am curious what is the active ingredient(s). 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. Then, we got what was loosely described as winter gas, all year round, with RFG. Shopping Cart Yes, you will need to buy the type of connection you want to use such as hose barb, compre. 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.Regulator has a 3/8" NPT . All Holley regulators are pre-set at the factory so there is no guesswork when first installing the regulator. My car runs and idles fine with no flooding when running with the electric pump, the flooding only occurred once when it vapor locked. It will get you close. '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 . 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. 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. Yes the light elements will still be in there. Interesting theory. I have used kerosene to avoid vapor lock and there is no doubt it helps, the more the better up to 20% in a low compression 1920's car. Holley's products include carburetors, fuel pumps, fuel injection, intake manifolds, and much more. Some can be used for either - or. I do wish there were some stamped values on the adjustment screw like other models I have seen. 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 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. Two Port Everything does just fine, until temperatures rise above 80 degrees or so, as they are soon to do. Your question might be answered by sellers, manufacturers, or customers who bought this product. All Holley regulators are pre-set at the factory so there is no guesswork when first installing the regulator. 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. I like the attached simple explanation of the issue. I found this document on my local Oil Refinery's web site and it may help explain some of the problems with vapor lock and hard start. What Rusty writes IS correct. fuel pressure in at the top, fuel pressure out on each side. 12-804 12-500 Low-Pressure Fuel Regulator (std. Tags: None TheSilverBuick ALMOST Spidey ! Learn more about our Shop Fuel Pressure Regulators at Summit Racing. 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. Could you explain a little more about how you would run the bypass? Spring clothes pins, aluminium foil, wet burlap, etc. 03-28-2012, 03:04 AM. 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. This satin finish regulator feature 3/8 pipe thread . It does however produce an irritating fume that irritates the eyes and mucous membranes when burning in gasoline. Is it a product that would be sold by a panel beater's supply shop? Refineries have been doing this for decades. Fuel Pressure Regulator - Walmart.com Exclusive, high-quality Global Featured Holley Transmission Kickdown Cable Bracket 20-121; Gold Zinc Steel for 700R4 . 100% Satisfaction Guaranteed CBPN804A Swinging Drawbar Pin Kit Ford NAA the cause for your fuel pressure fluxuation is because the fuel pressure is bumping up against the regulator and the extra fuel has no where to go , the quick fix is run a return line . One needs to have studied Chemistry as I have to actually know how this works. Now my equipment sits idle while I wait for a response from the vendor. The BALL shuts off the fuel flow until the pressure on the other side of it lets fuel get past it to keep the pressure constant. Reviewed in the United Kingdom on January 31, 2016, Reviewed in Canada on January 27, 2023, Reviewed in Canada on December 18, 2019, Reviewed in Canada on November 10, 2020, Automotive Performance Fuel Injection Systems, Automotive Replacement Fuel Injection Pressure Regulators, Learn more how customers reviews work on Amazon, Holley 12-804 Reg, Fuel Press 1-4 Psi Pol. Holley 12-804 - 2-Port Carbureted Fuel Pressure Regulator Fuel Pressure Regulators Instruction Sheet (42712804), Designed to be used with standard pump only, Measures 2-1/2" wide and 1-1/2" tall and deep, This low pressure fuel regulator is factory-set to 2.7 PSI, but is fully adjustable from 1 to 4 PSI, It includes mounting bracket with 2 each self-tapping screws for regulator to bracket installation purposes and 3 screws for bracket to vehicle installation, 1-3/4" hole spacing to mount the regulator to the bracket. 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. [endif]--> http://www.bp.com/liveassets/bp_internet/retail/retail_australia/STAGING/local_assets/downloads_pdfs/f/FN_modern_petro_vintage_engines.pdf,