Since the airflow does not have to make a right angle turn before the venturi in the typical down draft installation, the pressure losses associated with the 90o turn are eliminated. If fuel flow is OK at carburetor, concentrate on the combustion chamber which needs a very delicate mix of a near exact amount of both "air" & "fuel". After that you have to hold it at half open throttle to get it running. How much you have to try out. When does it up and die? Is it when you are in a steady load or when you grab the throttle to speed it up. Lots of those gas burners will just coug It sounds like you either need to adjust the float level or maybe the needle is just hanging. I'd love to connect. It is extremely important that the carburetor is kept spotlessly clean inside and out. https://www.ebay.com/itm/New-Carbure=STRK:MEBIDX:IT&_trksid=p2055119.m1438.l2649, https://www.ebay.com/itm/Carburetor197?_trksid=p2349526.m4383.l4275.c10#viTabs_0. Thanks so much. How are the points , condesor, cap and rotor, also run only champion D-15y plugs and you can put a new coil on there with a built in resistor . In 60 seconds you can push the throttle most of the way in and drive away. If I can start it (spraying carb cleaner into the carb) it runs nice, WOT down to a even idle. Leaking fuel is float needle seat problem, you should be able to correct that. Thanks anyway. Thanks for the reply. Interesting. I am very excited that it is running as it should. With a vacuum tank this is not the problem as long as not all of the gas in the vacuum tank has been leaking out. I just got mine from Amazon. The cars start easy, if you retared the spark from the steering wheel, and choke 3/4 out. Considering the OEM Briggs carbs are made in China now ( Check the fine print on the label) I would go with one of these. Flooding out it appears. It is normal for an updraft to loose a few drops of fuel following a failed choke assist start. If it is too low, the engine will have an off-idle stumble Guest lanceyboy Gravity feed: If your aircraft has fuel tanks higher than the carburetor Problems with vapor lock are most common on older vehicles that have a carburetor and a mechanical, engine-driven fuel pump. This is my first car with an updraft carb. A true flooding carb will sit and drip with the fuel valve on and not running. Reinstall the mixture screw the same number of turns from seated as before. I will try that out. I had a 460 about 5 years ago kick my tail and after two days of a different carb, drain fuel tank, new intake gasket , new distributor , new coil, points , condesor, cap rotor wires , 30w low ash oil and it would pull on the dyno for 5 minutes and then pull down and quit. Its not magic, its just a pressure differential. If you take it apart again - soak the float in cleaner for 30 minutes . As it turned-out a rust particle from the old gas tank had caused the float valve to stickthe carb fooded & dripped hot gasoline on the hot exhaust manifold!!! Or Bates, both of them advertise in Red Power magazine. Check for deteriorated or soaked gaskets that can cause a slight leak. Don't switch the carb because the up draft is a much better carb then the tank style.let me know if you have any questions about these carbs, I have an original service bulletin for them. I think that over chokeing to overcome starvation of fuel causes the flooding. Replaced the choke rod, and put a new gasket on the carb. Actually this sounds as though the carbs not getting enough fuel rather than flooding- it sounds as though you're just using up whats in the bowl. Clean the needle with carburetor spray when done. Check Amazon. Running the GAV too rich will cause loping and black smoke from the exhaust but won't cause flooding and dripping at the carb. The updraft allows the inline engine to be mounted relatively tightly without these design restrictions. When hot not choke and about a quarter inch out on the throttle. I just came up with on my own and there was some field testing that had to go on here. Before these last few years, my uncle pulled the gas tank and drained it, then cycled the engine a few time with good new gas. This tractor has a 3 cylinder, 158 c.i.d. Carburetor "Flooding" or "Starvation" ???? Your needle and seat is probably getting crap stuck in it from the tank causing it to flood. I have worked on my old farmalls that do that. This carb should NOT drip!!! Is it when you are in a steady load or when you grab the throttle to speed it up. For the signal to be strong (efficient fuel atomization and emulsification), the carburetor and intake manifold must be tight and not have even the slightest air leak., So the first step is to make sure all of the fasteners that hold the carburetor together and the intake manifold and cylinder head are tight. Thank you all so much for the help. Found bad solenoid valve, bad gas, OEM fuel pump replaced with electric. The needle and seat are NOT compatible with the original. Ok so I assume after the hose is in place and plugged you run the engine and monitor the level at that point. Or am I getting lost again? On the $15 carb, most adds say for a number of different HP's and the jets are usually to small for the 16 HP. If you have an Arctic Cat dealer near you they have clear fuel line. 2023 HOLLEY PERFORMANCE PRODUCTS, INC. ALL RIGHTS RESERVED. Even the larger gas tractors have the updraft carbs. I love our new home in Montana and love having IHC and Farmall as part of my everyday life. I used to close the valve under the vacuum tank when I parked my Hupmobile. January 31, 2006 in General Discussion, Just purchased a 31 auburn . I agree with Frank. Just go over all your steps when you put it together you must of missed something. WebIf you are sure the float is OK, you might make certain that the float is not touching the sides of the carb when you reassemble it. What was the shortcoming of updraft? Start by making sure it has a screen in the fuel shutoff valve. Also when you mount the carburetor to the block make sure it is sealed good. Most folks don't know it is happening!!! I've found that the stand up filter in the cut off valve is a necessity in most cases. ). Discussion in 'The Hokey Ass Message Board' started by kookee, Mar 24, 2010. Or Bates, both of them advertise in Red Power magazine. Ok, I will start checking the fuel supply to the carburetor and see if I can find any blockage along the way. I don't really understand what you mean by you engage the fuel So now I have to ask where should the level be on the carb bowl on my M. Thanks for the feedback guys. Your needle and seat is probably getting crap stuck in it from the tank causing it to flood. Bare in mind if its warm enough u may not need to chok The updraft carburetor was used in the beginning because of the lack of a pressure fuel pump. wm_group_name='/services/webpages/d/e/developmentstrategies.org/public/stat/_vti_cnf'; Poor compression might be the actual culprit. However, if the choke is functioning normally, I do not understand why placing one's hand over the ai None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. I reblt my 8 hp updft carb; and it willnot idle at all:done it all,What next? The carb does not flood anymore. However if you have an oil bath air cleaner you don't necessairly need an updraft carb. John Deere and its logos are the registered trademarks of the John Deere Corporation. The phase change occurs through the latent heat of vaporization. They should NOT drip!!! You can have the idle mixture set properly, but if the power jet (which is a load-based fuel-enrichment circuit) is not correct, the engine will idle fine, but it will run poorly as the throttle is opened or the tractor is loaded. Your dripping could also be caused by over choaking + improper starting settings!!! My dad used to say the question is not who called the picolo player a sob, but rather who called the sob a picolo player! Also another thing to check would be your throttle plate shaft. I don"t know why the tractor you"re describing used a lift pump but the folks who designed it must have had a reason or they wouldn"t have done it. I have a good carb off of a running 454. not sure it is the same but will sell if interested. A quick in-the-field remedy is to race the engine and, at the same time, choke the air intake by hand or with the choke plate. JavaScript is disabled. But, I have to keep the choke pulled out some ways. Re: flooding Zenith carburetor. That is dangerous in my garage, with gas pilot lights for the hot-water and furnace! The Kibbe and Friends Show: The Price Is Wrong! WebCarburetor Is Flooding Obviously flooding is caused by too much fuel getting into the cylinders. I found the adjustments to be run in all the way so set those before you start. Where are you located? The cars start easy, if you retared the spark from the steering wheel, and choke 3/4 out. JavaScript is disabled. go for getting one at renners corner a few more dollars but good quality and different design. Then when the engine is started, even if it starts without flooding, the motion might expel some fuel, giving external drips. So you recommend using water instead of antifreeze? Replace your intake gasket and make sure you get the thicker gasket and make sure your heat riser valve is working. Pull the valve cover and adjust Bob I believe says if you have an updraft Carby you must have an oil bath air cleaner. Ed - I did say virtually all, not all (weaseling out ) ! The Johnson's differ from what most would consider "conventional" updrafts in that they ha removed and disassembled carb found nothing wrong solenoid working, needle valve working, floats good. wm_track_alt=''; Do some searching, should find complete rebuild and setting specs. The sales pitch - if the carb needs rebuilding, we can probably help you with a rebuilding kit. This may be the case after the car has been standing for some weeks, because it may be difficult to have the needle valve to be completely free from leakage. The job of the carburetor is to do the first two. And when the hose to the air cleaner rises, its possible for the updraft carburetor with a leaking float This happened about two months ago, but then the tractor ran with no problem after sitting for a couple of days. This can be deremine by when there is no gas in the carb, rotate it from upside right to up side down and listen for the floats to flop inside. I cleaned out the gas lines which gave me a much better flow of gas to the carb. Contact Us - DO NOT EMAIL CAR QUESTIONS. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. In hot weather the gas in the carb may also boil out so it is empty wen you try to start the car. Thank you for the resource. Sponsored Links (Register now to hide all advertisements). In most cases it will work or get me fairly close. Flooding is when excess gasoline gets into the cylinders. Is there any good guides out there on how to clean out the carburetor and do it myself? There was a screen on the fuel shut off valve but after many years they rot and fall off. To remove it, take out the main adjustment screw in the bottom of the carb. When cold. The throttle closes carb butterfly but fuel shut off is on sediment bowl. There are some great RED guys in the Seattle area that can help with your project, however you really should try to figure this out for yourself, so much more rewarding.