I still suspect the flooding was due at least in part to fuel boiling in the carburettor bowl and venting the vapor above the float could assist. 9 really is max. Holley(R) has been the undisputed leader in fuel systems for over 100 years. The only difference that the Holley tech told me between the two springs is the color. Product very good. To minimize exposure, avoid breathing exhaust, do not idle the engine except as necessary, service your vehicle in a well-ventilated area and wear gloves or wash your hands frequently when servicing your vehicle. How much should I add to every gallon of gas.I believe they are adding about 5% ethanol to the fuel here. . Rusty, thanks so much for this information. I did, works great & looks beautiful. 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. Copyright 2008-2023 OReilly Q: For over a century Holley has driven the cutting edge of fuel-system design. It needed a bit of adjusting for my purpose, but other than that, it performed perfectly. 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. Otherwise it's good. It is a measure, as I understand it, of how readily the fuel will evaporate in open air. and a rotary click style one here on the shelf pete, you are welcome to borrow them to troubleshoot your problem.. let me Know. It is an experimental thing and MORE IS NOT BETTER - less is better until you find the happy medium based the fuel you buy or have in the tank already. It does however produce an irritating fume that irritates the eyes and mucous membranes when burning in gasoline. Error posting question. THE SECOND ISSUE - the vapor system on the Packard is going to be a problem no matter what today. Copyright 2023, Antique Automobile Club of America. Purchased the regulator from Baxter, unit arrived in 4 days.. It is not all the same. 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So with that vapor fueling system - you are stuck "downgrading it" to a lower quality fuel. This will keep your pressure steady and have instant pressure change when adjusting. 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 . 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. I mix Industrial Maintenance Coating Thinner (IMCT) around 1 oz per gallon - which is basically a blend of petroleum distillate in the paint thinner / mineral spirits (once called also "white gas") family and ethyl acetate and not only does it cure vapor lock it increases octane because you can feel it in the power and acceleration. [endif]--> Many thanks for taking the time to clarify this interesting subject . I installed this on my Onan 7000 generator as part of a project to resolve vapor lock issues in hot weather and high altitudes. Some Holley 12-803 4.5-9 psi and 12-804 1-4 psi regulators mislabeled from factory. Also, what is it about Kerosine, and possibly the products like LeadMx or Marvel Mystery Oil (mentioned specifically in the article) that drive some improvement? Shopping Cart Like many others, I have been considering what to do recently. Decrease pressure by turning the adjustment screw counter-clockwise. 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. There are two kinds and they look the same. Could you explain a little more about how you would run the bypass? The reliable, albiet slower, stovebolts never suffered vapor lock because the fuel pump and lines were up front in the airstream of the engine fan. The summer gasoline vaporizes in the line and the heat soak is quicker and longer on hot day's. %PDF-1.4 If so how? Call 800.979.0122, 7am-10pm, everyday. Never had it act up while running, but since E10 fuel came along it is borderline getting started after hot shutdowns. [endif]-->