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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. 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 . Reviewed in the United States on April 2, 2022. Loosening the regulator locknut and turning the adjustment screw clockwise increases the pressure. Reasonable . The vapor lock issues that I have are with 1920's Packards where the fuel system is essentially at atmospheric pressure throughout. Some have reported more power, easier starting and cooler running especially in very low compression cars of the twenties and early 30s. Log In / Register Order Status. Everything does just fine, until temperatures rise above 80 degrees or so, as they are soon to do. Shipping was fairly fast. Accurate description. A long time ago it was in use in the oil business. Auto Parts v 6c02f45cd (2fvgn) cv1440. Holley 12-804 Carburetor Fuel Pressure Regulator 1 To 4 PSI Bottom Is Inlet Sides Are Outlets for a sandrail, rock Crawler, KOH, Ultra4, truck, UTV, side-by-side, dune buggy, mini buggy, manx, king of the hammers, 4x4, or Jeep. Thanks again fellows, for such informative posts. Holley 12-803 Two Port Chrome Fuel Pressure Regulator - 1-4 PSI. Daily newspaper from Sapulpa, Oklahoma that includes local, state, and national news along with advertising. What you write in post 12 is NOT correct. The 12-804 is made from durable aluminum and has a satin chrome finish that is extremely resilient to corrosion and abrasive chemicals. finish) . 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? Too much fuel pressure for a given needle and seat assembly can overload the needle and seat and may cause flooding or drivability problems. Sorry, we were unable to perform your search at this time. Q: Full content visible, double tap to read brief content. It is not intended to be sold or used for any other purpose. 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. If you put in too much you can return the fuel to some "kick" without knock with a small amount of acetone. 10 in stock. P/N 12-803, 12-501, 12-804, 12-500, & 15812NOS Installation Instructions WARNING! ", So . I am intrigued by you statement, "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.". (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. The Holley 12-840 fuel pressure regulator features 3/8" NPT in/out ports. That was in the 1990s, so you can project to more current times and suspect we have something more sophisticated now. For cars that require 4.5 to 9 PSI, the Holley 12-803 is the right model. Chrome Finish. Most regulators need to be flowing to set pressure. Each Holley fuel pressure regulator is fully adjustable so regulating the fuel pressure to your engines needs is a simple task. 0 I'm suggesting to raise the boiling point by adding heavier or oilier substances such as kerosene. Use with standard pump only - not recommended for maximum pressure pumps. Loosening the regulator locknut and turning the adjustment screw clockwise increases the pressure. Please try again. 3 0 obj <>stream Prewar cars have very low compression and will run better on gas that has some kerosene added. Holley 12-804 Fuel Pressure Regulator 3/8 pipe thread ports 7/32 restriction Pressure ranges from 1 to 4 PSI Includes mounting bracket Satin finish This regulator is used to adjust to fuel pressure requirements of various carburetors and supplies the proper pressure to the needle and seat valve to prevent flooding or drivability problems. Some of these items ship sooner than the others. I had hoped that the cooler fuel from the electric pump would solve the problem but it did not. Terms of Service. 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. $5 Off Your $100 Mobile App Purchase . I've had some luck using LeadMax2000 but it's not a 100% cure. Vapor lock is caused by usually a fuel that vaporizes too easily at too low a pressure (in the line) due to under-hood heat and not enough pressure on it - which would run great if it could make it to the combustion chamber first. the fuel pressure gage needs to be in the line going to carbs. A: 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. To see our price, add these items to your cart. Vapor lock was just a fact of life for the Fords. As the car is parked Temperature. It does however produce an irritating fume that irritates the eyes and mucous membranes when burning in gasoline. Fuel pump regulator has 3/8" NPT inlet/outlet ports. I can only say acetone will lower flash point (light easier) but also lower auto-ignition temperature and thus create knock into too much of a quantity - while a very little bit will raise octane but not lower auto-ignition - so if you go TOO low with kerosene or diesel you can bring back some kick to the fuel with SMALL amounts of acetone. All Holley regulators are pre-set at the factory so there is no guesswork when first installing the regulator. 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 Holley's products include carburetors, fuel pumps, fuel injection, intake manifolds, and much more. Tags: None TheSilverBuick ALMOST Spidey ! 4.25 out of 5 stars. So with that vapor fueling system - you are stuck "downgrading it" to a lower quality fuel. 12-804 12-500 Low-Pressure Fuel Regulator (std. I do not think we hi-jacked the thread - the article is not even available anymore online to read. . [endif]-->. Any of these heavier than gasoline petroleum distillates above will raise the vapor point of gasoline if mixed into it. 3/8 pipe thread ports; 7/32 restriction; . It will meet your needs and deliver great quality at an affordable cost. 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.