He asked about issues and thoughts of what causes vapor lock, so it is just answered in more detail and suggested solutions on how to fix vapor lock. 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. (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. Great feedback from a knowledgeable group, guys! (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 . The term heavy ends may be old fashioned and obsolete. 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. 9517377223. Kerosene diesel fuel or stove oil will work. 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. This regulator is used to adjust to fuel pressure requirements of various carburetors and supplies the proper pressure to the needle and seat valve to prevent flooding or drivability problems. The summer gasoline vaporizes in the line and the heat soak is quicker and longer on hot day's. Holley HOL 12-804 12-804 Fuel Pressure Regulator. 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. This item can be returned in its original condition for a full refund or replacement within 30 days of receipt. The regulator is a Holley 12-804, I was told it went down to 1 psi and I have a stock mechanical fuel pump. Can anyone speak to the validity of this or is anyone currently using an additive for this? You set it to the exact fuel pressure you want. Then I got this good one, to try to get 1.5 PSI to the Kadrons. ***The inlet pressure limitation is 7 psi. 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. 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. 4.25 out of 5 stars. US $57.76 Finish:Gold Zinc billet aluminum bracket that conveniently mounts a 12-803 Black anodized 12-804 or 12-803BP fuel pressure regulator utilizing the passenger side carb studs on any 4150 / 4160 style carburetor. Q: If the carbs are drawing fuel and you lower the pressure at the reg, it should show on the gauge. To see our price, add these items to your cart. Right & left, Customer Reviews, including Product Star Ratings help customers to learn more about the product and decide whether it is the right product for them.Learn more how customers reviews work on Amazon. It works but not as well as some of the off brands like spectre. I do wish there were some stamped values on the adjustment screw like other models I have seen. Add some heavy ends. One is a deadhead and one is a by-pass. Sorry, you're using a web browser that is no longer supported. None of them worked. In fact I can completely remove the adjusting screw and it still does not go down to 3psi. Regulator Box showed signs of being opened and clumsily closed and the advertised Rubber Gasket or Gaskets that were mentioned in the instructions were missing. Please try again. . 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. Please choose a different delivery location. => https://www.holley.com/data/Products/Technical/199R7914-3rev3.pdf. Never had it act up while running, but since E10 fuel came along it is borderline getting started after hot shutdowns. They sold more gas than coal oil. . 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. What I would do, is with the car off, (or electric pump off), turn the screw a good ways out. The engine was running. the fuel pressure gage needs to be in the line going to carbs. 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. Open the unit and check the spring color, Reviewed in the United States on April 9, 2018. Now my equipment sits idle while I wait for a response from the vendor. I can start my car instantly after sitting in a cool garage at about 75 deg F. Drive 30 miles and then park for 20 minutes. I still think they sent you the high pressure one. Unfortunately, these FPR are now made in Korea and they no longer include an alternate spring. bowls after each run, just to see exactly at what temperature the problems become apparent. The Holley Fuel Pressure Regulator (Part No. [endif]--> http://www.bp.com/liveassets/bp_internet/retail/retail_australia/STAGING/local_assets/downloads_pdfs/f/FN_modern_petro_vintage_engines.pdf, . Gasoline was so light if you left the cap off a gallon can it would all evaporate in a few days. This Holley FPR (12-804) use to be a perfect choice to solve the "too much fuel pressure" produced by the aftermarket fuel pumps on vintage VW. 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. Each Holley fuel pressure regulator is fully adjustable so regulating the fuel pressure to your engines needs is a simple task. Vapor lock was just a fact of life for the Fords. Exclusive, high-quality Global Featured Holley Transmission Kickdown Cable Bracket 20-121; Gold Zinc Steel for 700R4 . We work hard to protect your security and privacy. Unfortunately, these FPR are now made in Korea and they no longer include an alternate spring. Brief content visible, double tap to read full content. if you were packing them in boxes they would look identical. 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. '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 . Reviewed in the United States on April 2, 2022. I have used up to 20% kerosene with no discernible change and have spoken to people who told me that years ago on farms these old cars would run fine if started on gasoline then switched to 100% kerosene. I've had some luck using LeadMax2000 but it's not a 100% cure. We encountered an error while updating this page. Thus the "lowest boiling point are the cause of vapour lock" is also NOT CORRECT thinking. The BALL shuts off the fuel flow until the pressure on the other side of it lets fuel get past it to keep the pressure constant. The vapor lock issues that I have are with 1920's Packards where the fuel system is essentially at atmospheric pressure throughout. 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). Yes you can adjust fuel pressure with this regulator. Mounting Bracket Included. 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. In refining crude oil they distill it to separate out the different products. I'm still looking for the reg in this pic. Reasonable . Like many others, I have been considering what to do recently. I do not think we hi-jacked the thread - the article is not even available anymore online to read. I wanted to upload the map, but at 2.73mb, it was too big. 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.
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