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. Too much fuel pressure for a given needle and seat . The seller gratefully sent me a replacement part but the result was the same. Recommended Parts. I recently fitted an electric fuel pump to one of the cars. No issues. 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. 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. Never had it act up while running, but since E10 fuel came along it is borderline getting started after hot shutdowns. %PDF-1.4 . (Maybe this arrangement was intentional to assist in vaporising the fuels of the day but it is all bad in hot weather with today's fuels). Your question might be answered by sellers, manufacturers, or customers who bought this product. The following vehicles are considered Uncontrolled (Non-Emissions Controlled) Vehicles: WARNING: It is against the law to install this part on an Emissions Controlled Vehicle. May God's grace bless you in the Lord Jesus Christ. I now think that what was happening was that there was sufficient heat in the carburettor to boil the fuel, the vapor from the boiling increased the pressure above the float preventing it from rising and shutting off the supply. 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. I got all of my supplies in the Home Depot fittings section. I put it . If yes what size should I, A: Lower octane will not hurt your car if the compression is low. 12-804 : Quantity: Share : . It works but not as well as some of the off brands like spectre. Adjustable Fuel Regulation From 1 To 4 PSI .220 Inch 7/32 Inch Restriction. 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. Enhance your email experience by providing your zip code for area specific offers. The higher the RVP, the greater the tendency to vaporize or vapor lock. 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. (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. Too much fuel pressure for a given needle and seat assembly can overload the needle and seat and may cause flooding or drivability problems. Shipping cost, delivery date, and order total (including tax) shown at checkout. The chemistry class experiment you are referring to will yield the approximate boiling (vapor) point at STP - Standard Temperature and Pressure ONLY. i'm trying to figure out why you are running a T when there are two outlets. 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. You'll find they both have the same initial boiling point - been there and done it. Brands like MSD, Flowmaster, Hurst, Accel and many more make up the offering of enthusiast-driven products to deliver robust, complete performance solutions for builders, racers, and drivers. [endif]-->. It takes a lot to hurt today's stainless steel valves, but in an older car be careful - and an exhaust gas temperature gauge is not a bad idea to invest in. Typically there are "winter" and "summer" blends with different vapor pressures to promote atomization at cold temps and to discourage vapor lock at hot temps. Q: here's one installed,same holley low pressure regulator, line pressure in the top, one side is hooked to the fuel pressure sender, other to the line going to the fuel block. Fuel pump regulator has 3/8" NPT inlet/outlet ports. Seems like the first "RFG" was closer to the old "winter" blend, which had more higher-end distillates so it'd vaporize nicely in cooler weather. Hydrogen Power Central | The true source for powering engines with Hydrogen - not "HHO", Standard conditions for temperature and pressure - Wikipedia, the free encyclopedia, https://www.holley.com/data/Products/Technical/199R7914-3rev3.pdf. Street/Strip Carbureted Applications Generally speaking if your car was made before 1953 it has low compression. We work hard to protect your security and privacy. This experience ties with that the owner of a very early Twin Six Packard. Starting in 1970 leaded gas was taken off the market resulting in the gas we have today. The 12-803 BP is a By-Pass design of the same style. You refer to the problem of the additive increasing the propensity for the fuel to self ignite however in my case the compression ratio of the cars is so low (around 4 : 1) that I doubt that it would be a problem. One must understand the chemical reactions and interactions of blending other hydrocarbons into what we call gasoline and then still have it able to have the same properties desired of the product called gasoline. I cannot help you - and no one can without knowing the exact make up of the gasoline being refined where you are. Holley 12-804 1-4 Psi Carbureted Two Port Fuel Pressure Regulator: Item #: HLY12-804 : Quantity: Price: $53.99 Add to cart . Holley 12-804 low pressure regulator, Weber, jeep etc. Some Holley 12-803 4.5-9 psi and 12-804 1-4 psi regulators mislabeled from factory. If youre looking to dial it in accurately its not going to do it. Estimated Ship Date: Today. Wont be good for a finicky carb. [endif]-->,