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Lots of Chinese Holley 12-803, 804 etc knock-offs are available. Conversely if you go too high and it knocks - you can bring it down with kerosene or the paint thinner family. OD says the Boiling point of gasoline cannot be raised by adding a heavier hydrocarbon - such as kerosene or diesel - and points to a high school chemistry class experiment as his proof. 3/8Inch Npt Ports 1 Inch 2 Out. Adjustable Fuel Regulation From 1 To 4 PSI.220 Inch 7/32 Inch Restriction. Too much fuel pressure for a given needle and seat assembly can overload the needle and seat and may cause flooding or drivability problems. In some areas, according to the map, RVP can vary from about 7.0 to 9.0 in some of the fuels. 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. Point and secure it into a clean container Inlet pressure of 7 psi limitation means your pump can not put out more than 7 psi to the regulator for it to properly operate. Overview. My plan was to install a fuel pressure regulator on the line going to the generator so that the bypass valve needs less fine tuning to maintain the same pressure in all temperatures. Hi Bob, I can get a hold of some 99.7% pure ethyl acetate cheap. The ethyl acetate in the IMCT loosens hydrogen bonds on the gasoline making it easier to light to burn, but the "oil" - heavier hydro-carbon nature keeps the vapor point higher and flash point still low enough to give good performance. In the later 1960s, it was somewhat common for people who were going on vacation, in the summer, to add a gallon or two of diesel to a full tank of gasoline for their trip. A larger tank might need two quarts. None of these contain lead and so should not damage a catalytic converter if you have one, HOWEVER too much IMCT will prolong the burn and may result in unburnt - STILL burning HOT gas being exhausted in the exhaust cycle. 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. 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. 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. and a rotary click style one here on the shelf pete, you are welcome to borrow them to troubleshoot your problem.. let me Know. So if you're looking for a FPR to get 1-4 psi, then the 12-804 is no longer your best choice. Does this need to be mounted upright or is it ok on its side? http://www.jalopyjournal.com/forum/showthread.php?t=386155, Kingman, Arizona - The place on the way to other p, http://www.holley.com/types/Fuel%20Pressure%20Regulators%20-%20Carbureted.asp, (You must log in or sign up to reply here. Generally speaking if your car was made before 1953 it has low compression. Like many others, I have been considering what to do recently. % "Pure" Ethyl Acetate could be called an "alcohol" as Ethyl acetate is the ester of ethanol and acetic acid; and it is manufactured on a large scale for use as a solvent. September 21, 2010 in Technical. Got a gauge on the FPR to monitor, and at first it was great. 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. There was a problem completing your request. Could you explain a little more about how you would run the bypass? That is why fuel injection systems push usually 45 to 60 psi on the fuel at all times with a by-pass line - to keep it liquid and keep it moving - so it cannot turn to vapor in the lines. For the best experience please upgrade or visit the site on another browser. To see our price, add these items to your cart. Will changing the orientation change the preset pressure setting (checkball falling instead of raising)? Reasonable . If your having pressure controll issues with the Holley regulators you can eliminate most problems with stability by installing a by pass line back to the tank and usualy a street car can use 1/8 copper. So the goal is to raise the vapor point temperature without lowering the auto-ignition temperature or flash point or flame spread speed - or increasing the flame spread speed too much. Yes you can adjust fuel pressure with this regulator. Many thanks for taking the time to clarify this interesting subject . . 3/8 pipe thread ports; 7/32 restriction; . Sorry, you're using a web browser that is no longer supported. Never had it act up while running, but since E10 fuel came along it is borderline getting started after hot shutdowns. Too much fuel pressure for a given needle and seat assembly can overload the needle and seat and may cause flooding or drivability problems. Volatility is a measure of the gasolines tendency to vaporize under a given set of conditions. 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. Each Holley fuel pressure regulator is fully adjustable so regulating the fuel pressure to your engines needs is a simple task. (that is this one in the image below) The adjustment spring under the adjustment screw is pushing down on the diaphragm holding the ball off it's seat. Discussion in 'The Hokey Ass Message Board' started by striper, Aug 12, 2009.