Question about John Deere 4010,4020 Tractor Basic Carburetor Repair

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Our 4020 floods. It seems that there is too much fuel? I'm not familiar with this type of carb. Any ideas?

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I would guess it to be a bad needle and seat on the fuel float in the carb..i hope this helps..Keith

Posted on Jul 01, 2009


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No firing after carburator fitted from fuel injection

map sensor will stop all fire if not hooked up correctly. In order for you to run a carb, you will also have to remove the electric fuel pump from the tank, and install older style tank. if you try to use the electric pump in tank, it runs at much higher pressures, which will flood the carb with fuel, and the carb float will not be able to hold it back. So what are you going to do for a fuel pump? This is always a bad idea, best bet if you want to run a carb, is to get an engine set up for one and scrap that fuel injected block as it don't have a place to mount a mech. fuel pump. bad idea, bad idea, bad idea, your just spinning your wheels mate!

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There are two connections on the carb, one is connected to the suction side of the primer bulb, the other to the fuel pick up pipe in the tank, the idea is the primer pulls fuel from the carb, into the bulb and back into the tank, if the pipes to and from the primer are fitted round the wrong way it will try to push fuel into the carb and make it flood, so check the suction side of the primer is connected to the carb, and the tressure side is back to the tank.

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Even with brand new carburator, engine floods. What could be wrong? This is a model CS4000 and it was running just fine, when it quit, no sputter, just quit. Cleaning carb failed to fix it. Good...

Disconnect fuel line from the carb and let fuel run into a clear jar. Look for sediment or debris that could cause problems with the carburetor. If there is debris, you will have to clean the carb, by removing fuel bowl and disassembling the float assembly and needle. Back flush the fuel inlet port to ensure it the seat area is clean.

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I have a portercable 5250 generator works great starts great shutts down after about half hour maybe 20 percent load oil good disconnected oil switch, changed feul,carb seems good, bowl clean still...

Seems that you have covered all the bases. The problem that you describe could be related to fuel lock or restriction in the fuel delivery system. Easy to check. Remove the air filter and have carb cleaner ready. If you are near the gen when it begins to quit, spray just a little carb cleaner to see if engine tries to run. If engine begins to run or continues to run with carb cleaner, then suspect fuel delivery problem. If the engine seems to stop quicker with carb cleaner, suspect flooding caused by too much fuel pressure (fuel pushed past the needle due to pressure in the tank; open fuel cap and listen for air pressure release). Fuel delivery problems are caused by collapsed fuel line, restriction in the fuel cut-off valve, restriction at the fuel filter (use larger automotive type), negative pressure in tank caused by no vent at cap. Rare problem with fuel delivery is caused by sudden heat rise at the carb causing fuel to boil out of carb. This is caused by the engine running very hot, lack of air across cooling ribs caused by debris or fan missing blades. You can eliminate the complete fuel delivery system by mounting a small fuel tank on a stand and running fuel line directly to the carb for test. The tank needs to be higher than the carb so that you will have good gravity feed. Good luck

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1 Answer

Hi, my ST155 does not want to start, it JUST sparks up, shakes a bit and then dies. I am not sure if I should prime it more, or could it be flooded? I was using it a couple of hours ago and it was fine,...

This may sound mundane, but did you put mixed gas in when you refueled? How old was the gas you used to refill tank with? may need to take apart the carb(not much to it) and clean wih some carb cleaner, or fresh gas. Let dry and re-assemble. Do not try to take out adjustment jets(screws) unless you are very familiar with carbs though! Let me know after you clean carb and change fuel.

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1 Answer

My 1996 750 Katana runs but it will only run with

You may need to rebuild the fuel tap with a new diaphram kit.

The fuel tap has a small rubber diaphram and plunger, which can go hard, stick closed , or wear out and get a hole.
Also check the vacumn hose than opperates the tap is in good condition
Pri bypasses the vacumn opperated fuel tap, sometimes this can cause the carbs to flood or have higher than normal float levels..
Running it on prime can also cause the carbs to flood fuel into the engine filling the sump, which then s ucks fuel vapour through the crank breather into the airbox, and then through the carbs causing over rich.
If this has happened you also need to change the oil and fit a new air filter element

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1 Answer

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float adjustement buddy take the carb off take the bowl off and the float and bend the tab up a tad its filling it to much with fuel and not shutting off you can tell if its done correct by adding fuel and the fuel will rush through then sudenly shut off this is the float shutting it off any more info buddy just get bac to me39c5d94.jpg

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1 Answer

Toyota 22r starts hard and floods. Repalced

It sounds like the carb. float is set to high and /or the needle and seat has some dirt in it allowing to much fuel inside the carb.. This will allow to much fuel into the engine.It seems the carb could use a rebuild and dont forget to replace your fuel filter.I hope this helps.

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