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That's where the pressure was going. Click here to find a (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). The Holley 12-804 fuel pressure regulator is adjustable from 1-4 psi. The summer gasoline vaporizes in the line and the heat soak is quicker and longer on hot day's. The thinner, lighter products are at the light end of the scale the thicker heavier products are at heavy end. 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. Easy to read. Purchased the regulator from Baxter, unit arrived in 4 days.. This diaphragm repair kit is for 12-803 and 12-804 regulators. The point being here - you need enough steady high enough pressure on the ball to allow it to regulate down reliably too. Copyright 2023, Antique Automobile Club of America. The first opportunity to try it occurred recently. This went on until they developed the cracking process which allowed more flexibility in what they got out of the crude. Walk back over and looked again, 9lbs. This Holley universal low pressurefuel regulator is factory-setto 2.7 PSI, but is fully adjustablefrom 1 to 4 PSI. I cannot help you - and no one can without knowing the exact make up of the gasoline being refined where you are. 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. I found this document on my local Oil Refinery's web site and it may help explain some of the problems with vapor lock and hard start. Too much anti-freeze - (typically ethylene glycol) causes the opposite effect even under pressure of the cooling system. But the heavier elements will raise the boiling point of the mixture. Does this need to be mounted upright or is it ok on its side? For the best experience please upgrade or visit the site on another browser. So they started putting more of the low grade gas, or high grade kerosene into the gas. Part #: 12-807. . At first it seemed fine, set it to 1.5 PSI and away we go. Some parts are not legal for use in California or other states with similar regulations. Cool. Is there a brand name? . But, . The carburettor was flooding, the electric pump was still running. on this design the adjusting screw all the way out should decrease the pressure the most - IF the ball valve will seat TIGHT, When I adjusted pressure below 30 - it would not seat any longer even with the adjustment screw all the way out. TURNING THE ADJUSTMENT SCREW ALL THE WAY IN WILL RESULT IN EXCESSIVE FUEL PRESSURE . Gasoline was so light if you left the cap off a gallon can it would all evaporate in a few days. . May God's grace bless you in the Lord Jesus Christ. 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. As Raywith pointed out, you need to let the pressure go somewhere. The unit however is working fine but am curious about the missing gaskets and how important they are? 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 $4119 FREE Returns Adjustable fuel regulation from 1 to 4 psi .220" (7/32") restriction 3/8" NPT ports ( 1 in, 2 out) Mounting bracket included Pre-set at 2.8 PSI I have the one I have set up in a deadhead setup. Copyright 2008-2023 OReilly Holley 804 fuel pressure regulator install - YouTube 0:00 / 5:58 Holley 804 fuel pressure regulator install Schnebs Garage 2.42K subscribers Join Subscribe 72 Share Save 15K views 3 years ago. When it burns however, it is an eye and throat irritant, even though it raises octane, burns hotter, easier, and cleaner. Spring clothes pins, aluminium foil, wet burlap, etc. Going to check my VW bus fuel pump pressure. 12-804) is a Low Pressure (1-4 PSI) regulator. However I would welcome you advice on the following. I'm still looking for the reg in this pic. Mounting Bracket Included. Try it, I think you will find it works. near you The Holley 12-804 fuel pressure regulator features 3/8" NPT in/out ports. (see reg-setp.pdf), This is the same design as a Holley 12-803 or 804 knock off, so I looked up Holley's instructions. Thus the "lowest boiling point are the cause of vapour lock" is also NOT CORRECT thinking. ;b DK%*DO[%A IPd?Q~]=n1)E1D*q`D fF-"4N3i4\1uOn(@%c0IHQg`~uKVf{/r0d2}XVXi1-tpE1K[T*3"IS0v27UfTajff`"(dJD0fFlvryT{?:VUusSqD?R$LlalK&@$8q'qbSEv Carb Part, 14 PSI Fuel Pressure Regulator Set 3/8in NPT Port 12804 for Holley : Amazon.com.au: Automotive The issue is boiling points UNDER PRESSURE we are talking about here - though the BP article speaks to other issues of engine and carburetor design contributing to the vapor lock problem. ). Holley recommends applying PTFE paste to the NPT thread of the fittings before installation on these applications. MFG. 12-804 : Quantity: Share : . Shop Fuel Pressure Regulators at Summit Racing. Some cars are much more apparent to vapor locking than others, I"ve never experienced here in NJ with either of my older Packards which see all kind of hot summer driving conditions. and a rotary click style one here on the shelf pete, you are welcome to borrow them to troubleshoot your problem.. let me Know. The Holley 12-804 is one of the most popular low fuel pressure regulators that works perfectly for setups that require 1 to 4 PSI. Why does this occur only under increased pressure? I am having problems understanding why you say OD is wrong and Rusty is correct, it seems to me you are all saying much the same and that is that gasoline is made up of many components each having different boiling points and the components with the lowest boiling point are the cause of vapour lock. readings of the carb. None of them worked. [endif]-->, . This will keep your pressure steady and have instant pressure change when adjusting. Then I got this good one, to try to get 1.5 PSI to the Kadrons. It appears this one needs 40 to 50 minimum. Purchased the regulator from Baxter, unit arrived in 4 days.. Auto Parts v 6c02f45cd (2fvgn) cv1440. Will buy again if I need another one for a different project. Daily newspaper from Sapulpa, Oklahoma that includes local, state, and national news along with advertising. Somewhat of an inconvenience but that's why it's probably cheaper than other places selling the same part number. Much of the excess engine heat will end up soaking the fuel system under the hood. http://www.frontieroil.com/attachments/contentmanagers/106/PrdctsSpec_UnleadGasSpecs.pdf. Among other places on the web - you will find a fairly good dissertation of the issue at => Evergreen Performance Systems, Inc. and Hydrogen Power Central | The true source for powering engines with Hydrogen - not "HHO". I suspect as the article suggests even with all these steps you can still get the crap gas to boil if it is hot enough under the hood. A larger tank might need two quarts. 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. It is no different than mixing water with ethylene glycol to make what we call anti freeze or with methanol to make windshield washer fluid - you get a completely different product - it is not just water any more; and nor can you separate them back into their original separate entities - so you cannot think of them that way any more either. do you have a picture of it hooked up? He finally achieved significant improvement by fitting a vent to the carburettor top (which is routed away and under the car for safety). I ordered the 12-804 regulator online because I couldn't find one locally, this is for an engine on a piece of equipment that I make my living with. [endif]--> http://www.bp.com/liveassets/bp_internet/retail/retail_australia/STAGING/local_assets/downloads_pdfs/f/FN_modern_petro_vintage_engines.pdf,