I had this same problem on my DRZ-110.
I took apart the carburator to clean everything out, but when i re-assembled it it started to leak gas out of the drain hose. Then i found out that the problem was that one of my gaskets were torn and were letting air in the drain which prevents it from being a vacuum, therefore causing gas to leak out.
I would first check the float & make sure it isnt stuck, then i would check all of the gaskets and make sure they arent torn, & replace the ones that are, even if theyre slightly damaged they can still let in air.
Your carb has to be 100% sealed & vacuumed to prevent any leaks & for it to work fine, so get those gaskets checked out
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Re: gas leak from carb drain hose
If your float, that's in the bowl of the carburator is sticking, it won't "float" as the fuel fills the bowl and never stop the fuel from entering, causing it to run out the overflow vent hose. The float is what regulates the amount of fuel that goes into the carburator bowl. You can try to tap it with a screw driver handle to see if it might stop while it's doing it.
Your carb works a bit like the rank behind a toilet. The fluid (gas or water) comes in, float goes up, which pushes a valve shut, fluid stops.
If this "just happened" you very possibly have a bit of dirt blocking the valve (easy fix). You could also have a stuck float or even a flooded float.
One word of advice: try not to disassemble the carb over gravel or dirt - there are small parts that can fall out. Also, unless you understand how carb mixtures work do not mess with the adjustment screws other than the idle adjust.
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Re: gas leak from carb drain hose
If i got you right, this will always happen if the pipe is lower than the carb its a syphon effect so it will always happen. You either have to place your question more specifically because as such there is nothing wrong with that.
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Ohhhh... so that's what happened. Do us a favor and careful with posting so many questions. They're all the same thing anyway right? Your carb will probably have 3 hoses yea? the smallest one that goes to the bottom of the bike is the drain hose. Only used when draining the carb. On most bikes I own I leave that one off. The other two are an atmospheric vent hose and the fuel line. They might look similar Try pouring some gas through both inlets on the carb with the fuel bowl off. The one that lets fuel come through the float needle valve is the fuel line.
Yes it sounds like the over flow, and this means the float in the carb is stuck, this can happen if old fuel sits in the carb for extended times occasionally a tap on the carb with the handle of a screw driver can dislodge the problem, but usually it need the carb cleaned, ethanol fuels can also damage the float valve which would then need replacement. is a fairly simple procedure to clean the carb, remove the carb,you can pull it sideways and leave the top and cable attached remove the bottom of the carb remove the float and brass jets blow out and clean replace all. work slowly , in a clean area, pay attention to how it comes apart, even take notes or photos, dont adjust the idle or air screws nothing needs to be forced
Just guessing because I can't see what hose your talking about but if gas is coming out the hose when you turn it on I suggest looking at the carburator and I suspect the hose came off the inlet to the carburator. Thats the only place gas goes after leaving the tank, if it is coming out the overflow for the carb then your float is stuck. Some bikes have an overflow hose for this reason and it does not connect to anything just hangs down to let gas drain from the carb.
This happens when the float in the bowl sticks open. On a carborator the bowl holds gas. When the fuel pump fills the bowl the float raises and is pushing a needle valve that shuts off the gas until the float goes down and the needle valve opens and adds more gas. sometimes is sticks or the needle valve doesnt seat properly. You should rebuild it, buy a carb rebuild kit for your type of carb. It comes with new needle valves, just remember how it came appart. Good luck Robert
Your float in the bottom of the carb is likely stuck in the up position. The float attaches to a valve that shuts off fuel flow when level is just right. Can you see the little screw at the bottom of the bowl? Do you see the little overflow hose below that? Get a plastic soda bottle, put the outlet of the tiny hose into it. unscrew that little screw a few turns. Do you see fuel coming out? No? then take the back end of a screw driver and tap the bowl of your carb sharply 5 or 6 times. (Make sure the fuel pet **** under the tank is turned on. If you do not see fuel going into your bottle in a minute, shut off fuel at the tank. Screw the bowl drain back in. Remove the larger incoming fuel line that goes from tank to carb and put it into the bottle. Now you will open the petcock a little bit slowly. If you never see fuel come out of the tank, thru that hose, then your screens on the petcock may be clogged. Shut off fuel , Remove the cap on your fuel tank. blow into the line while slowly opening the petcock valve. Hear air bubbling in the tank yet? If you do, shut off valve, remove air pressure from line, point it back into the bottle and reopen the valve. If none of this works, then you need a new petcock valve.
There is no fuel pump it's purely gravity feed. At the bottom of the carb should be a bolt with a nut on it loosen the nut and start backing this out it is actually a needle valve and they frequently get corroded and need to be cleaned. Fuel should be coming out of the bottom of the carb, reinstall it and try again. If it's still not working your float may be stuck, or your carb is gunked up. I'd pull the carb get a carb kit and rebuild it. It's about a twenty minute job. Or take it into a mower shop and have them do it if your not comfortable trying. Gas won't flow out on the cylinder side unless you have a problem gas has to be sucked out of the carb by the negative pressure in the engine.
Initially and to my knowledge, some of the hoses connected to a carb would be:
from tank through fuel shutoff valve;
in some case a vacuum hose.
Of the above, the only possible hose that would fit your description would be the overflow hose. Should this be the case, then this indicates that the float inside the carb's bowl has not moved up to engage/close the inflow valve. A workaround is to tap the bottom of the bowl to jar the float to go up as well as the shutoff the inflow valve. The drain hose would also allow fuel to flow out from the carb but that would mean the drain screw is loose/opened.
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