We encountered an error while updating this page. 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. Check the status of your 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. The lower I can get with this pressure is 3.5 psi (at max adjustment). I recently fitted an electric fuel pump to one of the cars. Error posting question. THE SECOND ISSUE - the vapor system on the Packard is going to be a problem no matter what today. 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. As an example water would boil and thus "vapor lock" at a really low temperature without ethylene glycol. 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. 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. 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? 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. Today's cars are all fuel injection so it doesn't matter how easily the gas evaporates, it is under pressure in a closed system from the tank to the intake. Product very good. 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. To ensure this condition, the installation of a Holley 12-810 oil pressure safety switch is recommended couple more questions, Rusty, what exactly are "heavy ends"? In theory the vapor carburetor was the way to go in that day - with lower flash point fuels like poor grade fuels that all pretty much resembled the weight of kerosene in that early day of motor fuels. Holley recommends applying PTFE paste to the NPT thread of the fittings before installation on these applications. Adding some additives can raise the AVERGE boiling point but cannot remove the lower-boiling components, so regardless of what higher ends are present, the initial boiling point will remain that of the most volatile components. should be one inlet in two outlets out, i've seen very smart mechanically inclined people hook the carb to one outlet and the pressure in to the other, it's easy to do, not saying anything bad but could be a a possibility. Just open the hood and let things cool. See Standard conditions for temperature and pressure - Wikipedia, the free encyclopedia. Each Holley fuel pressure regulator is fully adjustable so regulating the fuel pressure to your engines needs is a simple task. . It's easy! . Powered by Invision Community, http://www.bp.com/liveassets/bp_internet/retail/retail_australia/STAGING/local_assets/downloads_pdfs/f/FN_modern_petro_vintage_engines.pdf. Generally speaking if your car was made before 1953 it has low compression. Holley Fuel Pressure Regulators 12-803 HLY-12-803. There was a problem adding this item to Cart. The Holley 12-804 is a 1 to 4 range PSI regulator. By 1913 it was the other way around. BP cannot by law tell you what you can blend into fuel to change its properties - but any petroleum distillate can be used - and the ester family - many of the alcohols we call them - can also be used. I will be fitting a pressure regulator, it can only help and will have to wait for the next vapor lock to occur to see if it overcomes the flooding. te4cmCbGnt]&~`N@RPyBTa$=~fo:/T 92YE)3Uofo4Ou].-zowDt*ae^qf9z/?. It's a diaphram with a spring. '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 . 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. This went on until they developed the cracking process which allowed more flexibility in what they got out of the crude. I appreciate it!! Lots of Chinese Holley 12-803, 804 etc knock-offs are available. They put everything they could into the coal oil including what we would consider low grade gasoline. Please try again. Find many great new & used options and get the best deals for Holley 26-137 Adjustable Secondary Idle Lever at the best online prices at eBay! Never tried it with my old Model A Ford but I heard that they will actually run on Kerosene.. So - you cannot just say whether it will work or not. In a deadhead design the fuel comes into the regulator from the bottom past a check ball which is held open by a pin on the diaphragm. bowls after each run, just to see exactly at what temperature the problems become apparent. Purchased the regulator from Baxter, unit arrived in 4 days.. Reviewed in the United States on April 2, 2022. Chrome Finish. [endif]-->