Discussion in 'The Hokey Ass Message Board' started by oldrelics, Oct 12, 2010. So in an open cup the boiling points would also appear the same as water but under pressure the boiling point is different. #2. But, . "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. Had to reset to Zero. 12-804) is a Low Pressure (1-4 PSI) regulator. To add the following enhancements to your purchase, choose a different seller. 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 . If I could get 75-85 octane, non-ethanol, Regular gasoline that vaporized at above 180 deg F, I think my car would run fine all the time. On the Holley 12-804 fuel pressure regulator, the factory preset is supposed to be 2.8 pounds - can anyone say is Holley usually pretty accurate on these presets? I have used kerosene to avoid vapor lock and there is no doubt it helps, the more the better up to 20% in a low compression 1920's car. This part is legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles. Never had it act up while running, but since E10 fuel came along it is borderline getting started after hot shutdowns. Can anyone speak to the validity of this or is anyone currently using an additive for this? I switched on the electric pump and it instantly picked up and ran for a few seconds then reverted to the classic vapor lock symptoms. As you can see in the photo it's gold, (the same colour as what's in the model 12-803) I called Holley directly and customer service is acting like they're unaware of the issue, even though I've read threads online going as far back as 2018 mentioning this. The Holley 12-804 fuel pressure regulator features 3/8" NPT in/out ports. Stay up to date with the latest releases, events, promotions and more. ). These will raise the boiling point of the fuel but reduce the octane. This will ensure that the pump will not continue to operate after the engine is . Call 800.979.0122, 7am-10pm, everyday. The 12-804 is made from durable aluminum and has a satin chrome finish that is extremely resilient to corrosion and abrasive chemicals. Reviewed in the United States on June 20, 2021. use a 1/16 - 1/8" restrictor in the end of your fuel line to see if you can set the pressure then. I would welcome your advice on this - with apologies for the length of this post. Easy to read. Daily newspaper from Sapulpa, Oklahoma that includes local, state, and national news along with advertising. I feel I am 95% there, and a slight improvement would be all I need - for now, that is unless the ethanal mix changes (your tax dollars at work). They put everything they could into the coal oil including what we would consider low grade gasoline. I cannot help you - and no one can without knowing the exact make up of the gasoline being refined where you are. Steve_Mack_CT I think we have hijacked Steve's thread where he asked the question about raising the boiling point of gas which hopefully has been fully answered by these side issues. The only difference that the Holley tech told me between the two springs is the color. Neither the Holley instructions nor anywhere I can find says what the maximum inlet PSI should be allowed to the regulator - but I was told it was 16 psi and one other spot on the web says something similar. Reid Vapor Pressure (RVP) is a commonly used indicator of gasoline volatility. We are sorry. 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. Will rise to above 180 degrees on the Temperature gauge. Holley fuel pressure regulators are designed to precisely control the fuel pressure from the fuel pump to the carburetor. Another thing you can do is wire the fuel pump to be hot in run and start through an oil pressure switch - so if the motor shuts off or looses oil pressure the fuel pump shuts off too. I wanted to upload the map, but at 2.73mb, it was too big. I had a chrome dial regulator, which leaked gas everywhere but luckily didn't actually burn down my ride. Check "Reid Vapor Pressure" in Wikipedia, or similar. Was actually disappointed with the quality of the regulator. I tried to bring the 0-140 pressure feed regulator down to 30 by adjusting the two - to up the return flow and lower the feed pressure - but the 15 psi reg I had just worked on started to climb past 9. If you have it plumbed up "dead headed", lowering the pressure might not react very quickly. From start to finish, Holley has the parts to make your dream a reality. f9vxY"IpBQ? i'm trying to figure out why you are running a T when there are two outlets. It appears this one needs 40 to 50 minimum. . I have already been thinking about switching over to a modern fuel pump, say the Mallory 110, plumbing in a regulator just downstream of the carbs, and taking the bypass fuel back to the fuel tank. I do wish there were some stamped values on the adjustment screw like other models I have seen. All kinds of remedies were tried. MFG. I had hoped that the cooler fuel from the electric pump would solve the problem but it did not. We encountered an error while updating this page. 3/8 pipe thread ports; 7/32 restriction; . 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. I like the attached simple explanation of the issue. In fact I can completely remove the adjusting screw and it still does not go down to 3psi. Conversely if you go too high and it knocks - you can bring it down with kerosene or the paint thinner family. Estimated Ship Date: Today. 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. In answer to Rusty's comment about adding anti freeze to water, the difference is that water is only one material, H2O, with a single boiling point (varied only by pressure). The Holley 12-840 fuel pressure regulator features 3/8" NPT in/out ports. For any further assistance please feel free to call us at: 1-877-238-2623 or visit the nearest Advance Auto store and one of our representatives will gladly assist you with any questions or concerns you may have. The fuel pump and fuel line setting top center of the engine was not only in the hottest ambient temp, except for the exhaust manifolds, under the hood they acted as a heat sink transferring heat from the block to the air. I have the one I have set up in a deadhead setup. In refining crude oil they distill it to separate out the different products. There is no "chemistry set" method to measure fuel vapor points. I'm suggesting to raise the boiling point by adding heavier or oilier substances such as kerosene. Open the unit and check the spring color, Reviewed in the United States on April 9, 2018. do you have a picture of it hooked up? %PDF-1.4 This part is Backordered. Lower octane will not hurt your car if the compression is low. 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. Any thoughts on this? The fuel pressure is at 1 - 3 psig since the pump is not running. Depending what your compression is you could add 5% kerosene up to 25% for cars from the 20s with very low compression, like 5:1 or less. Mounting Bracket Included. Holley 12-803 Two Port Chrome Fuel Pressure Regulator - 1-4 PSI. Gasoline vaporizes according to fuel system pressure. I look upon that effort with a heavy heart though, for I have been religious about keeping the old car original as possible. (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. YES the boiling point of gasoline can be raised (or lowered) by an additive - depending on what it is - as can the autoignition temperature which will increase "knock" - using the right additive for the fuel you just bought and put in your tank is the trick and it is always going to be hit and miss - depending on what refinery produced the gasoline in the first place. fuel pressure in at the top, fuel pressure out on each side. Purchased the regulator from Baxter, unit arrived in 4 days.. 100% Satisfaction Guaranteed CBPN804A Swinging Drawbar Pin Kit Ford NAA 501 600 700 800 900 2000 3000 4000 satisfaction guarantee the daily low price westernnorthndc.org, US $11.9 3000 501 Also services earlier models (1953 to 1964) using swinging drawbar: NAA 600 For Ford Tractors 2000 4000 (1965 and up) Jubilee . Part #: 12-807. . The two will be very close to the same just as would Water and Anti-Freeze boiled in an open pot. What one is after is new "liquid" fuel which vaporizes easily in open air, lights easily and has a rapid flame spread but NOT a hot explosive one, and burns easily and completely under one atmosphere of pressure - what we call 14.7 to 1 - BUT - and this is most important; does not auto-ignite at a low temperature and WAITS to be lit by the spark after being compressed in the cylinder. He finally achieved significant improvement by fitting a vent to the carburettor top (which is routed away and under the car for safety). 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. To keep it on simple terms, several people have confirmed that adding some kerosene, diesel fuel or stove oil will reduce the tendency to vapor lock and will NOT hurt an older model, low compression engine. '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 . Recommended Parts. Take a look at the article below. Brief content visible, double tap to read full content. Now my equipment sits idle while I wait for a response from the vendor. Sorry, we were unable to perform your search at this time. Unfortunately, these FPR are now made in Korea and they no longer include an alternate spring. 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. Depending on what kind of electric fuel pump you used you will need a regulator - or series of regulators to step down the pressure getting to the carburetor like a Holley 12-803 type at the very least. Holley Fuel Pressure Regulators 12-803 HLY-12-803. The '54 Bentley already has an electric SU pump back near the tank, and it's low pressure output is just about right for the two SU H6 type carbs. December - February gas mixture begins to vaporize at 11-15psi at 105 deg F, April gasoline is 9-11.5 psi at 124 deg F. If you had winter gasoline in your Antique car on a 100 deg day you would only be about 5 degrees from vapor bubbles in the fuel. Will changing the orientation change the preset pressure setting (checkball falling instead of raising)? 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. You would'nt just be reading the inlet pressure would you? What I would do, is with the car off, (or electric pump off), turn the screw a good ways out. Part Number: HLY-12-803. Fuel pump regulator has 3/8" NPT inlet/outlet ports. I have a holley low pressure reg. 1 oz per gallon - not more than 2 is usually in the right "goldie-locks" range. These cars have the carburettor mounted in "V" of the engine with exhaust manifolds running along each side of the carburettor which combined with under hood engine heat makes these cars very susceptible to vapor lock. Q: P/N 12-803, 12-803BP, & 12-804 Installation Instructions 199R7914-3 NOTE: 12-803BP IS NOT TO BE USED WITH MECHANICAL FUEL PUMPS! The owner had tried all practical means to reduce the heat gain of the fuel system but with little improvement. Please try again. The lower I can get with this pressure is 3.5 psi (at max adjustment). [endif]-->,