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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 9517377223. 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. This satin finish regulator feature 3/8 pipe thread . The 12-803 4.5-9 psi spring is plain, (just the gold colored plating) the spring is accessible and replacable The cheap dial units are terrible. Full content visible, double tap to read brief content. Free shipping for many products! 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. What I would do, is with the car off, (or electric pump off), turn the screw a good ways out. The 12-803 BP is a By-Pass design of the same style. In those days before 1905 kerosene had a strong piercing odor and coal oil lamps sometimes exploded. You would'nt just be reading the inlet pressure would you? . Keep in mind that when there is pressure in the line, backing off on the adjustment isn't going to make the pressure go down. For the best experience please upgrade or visit the site on another browser. What you write in post 12 is NOT correct. Holley recommends applying PTFE paste to the NPT thread of the fittings before installation on these applications. It IS variable and a result of the various fuel blend components. Worked well out of the box. It is a measure, as I understand it, of how readily the fuel will evaporate in open air. I put it . YES the boiling point of gasoline can be raised (or lowered) by an additive - depending on what it is - as can the autoignition temperature which will increase "knock" - using the right additive for the fuel you just bought and put in your tank is the trick and it is always going to be hit and miss - depending on what refinery produced the gasoline in the first place. 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. Everything does just fine, until temperatures rise above 80 degrees or so, as they are soon to do. Then, we got what was loosely described as winter gas, all year round, with RFG. 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. ***The inlet pressure limitation is 7 psi. Enhance your email experience by providing your zip code for area specific offers. I did, works great & looks beautiful. See also Tom Ogle's "modern" vapor fueling system - google it. Unfortunately, these FPR are now made in Korea and they no longer include an alternate spring. I have a electric pump at the tank to try and speed up the fuel cooling process but if you have a 100 deg F day you may have fuel near 100 deg F in the tank. The following vehicles are considered Emissions Controlled Vehicles: *Free Shipping & Handling only offered to the contiguous US on orders over $100, excludes clearance parts and oversized packages. You need to be a member in order to leave a comment. 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. 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. So they started putting more of the low grade gas, or high grade kerosene into the gas. I have no idea - you are in uncharted territory. A vapor lock condition would be caused. 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. Too much fuel pressure for a given needle and seat assembly can overload the needle and seat and may cause flooding or drivability problems. Add some heavy ends. 12-804 12-500 Low-Pressure Fuel Regulator (std. Our payment security system encrypts your information during transmission. Q: Exclusive, high-quality Global Featured Holley Transmission Kickdown Cable Bracket 20-121; Gold Zinc Steel for 700R4 . Holley part number for the kit is 12-807; Summit sells it for about $6. For over a century Holley has driven the cutting edge of fuel-system design. #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? Post in the forum instead. I have found IMCT is a happy medium that does both in the right quantities - raise boiling point and octane just enough to be a "goldie-locks" kind of additive to help prevent vapor lock. 12-804 : Quantity: Share : . The Holley 12-804 fuel pressure regulator features 3/8" NPT in/out ports. The peak was reached in the sixties when heavily leaded gas of over 100 octane was available. ${cardName} unavailable for quantities greater than ${maxQuantity}. This is the complex world of Chemistry - which is far too complex to go into here. Great feedback from a knowledgeable group, guys! . Troubleshooting Carburetor Problems and Vaporlock Blues Revisited - Hagerty Lifestyle. Shiny Finish. Amazon has encountered an error. Too much anti-freeze - (typically ethylene glycol) causes the opposite effect even under pressure of the cooling system. Mounting Bracket Included. The Holley 12-804 fuel pressure regulator features 3/8" NPT in/out ports. Holley carburetors have powered every NASCAR(R) Sprint(R) Cup team and nearly every NHRA(R) Pro-Stock champion for four decades. Holley HOL 12-804 12-804 Fuel Pressure Regulator Brand: Holley 436 ratings | 33 answered questions Amazon's Choice in Automotive Replacement Fuel Injection Pressure Regulators by Holley $4119 FREE Returns Adjustable fuel regulation from 1 to 4 psi .220" (7/32") restriction 3/8" NPT ports ( 1 in, 2 out) Mounting bracket included Pre-set at 2.8 PSI ${cardName} not available for the seller you chose. Vapor lock was just a fact of life for the Fords. Free Shipping - Holley Fuel Pressure Regulators with qualifying orders of $99. Of course you may already have this setup - that is the first issue. . Reasonable . Boy am I glad to have happened on this thread. Holley HOL 12-804 12-804 Fuel Pressure Regulator; ; Customer reviews . 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. Had to reset to Zero. Yes, you will need to buy the type of connection you want to use such as hose barb, compre. The issue is simple that one is seeking to "re-blend" their own gasoline from one already sold. Holley Fuel Pressure Regulators 12-803 HLY-12-803. . [endif]-->