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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<span><span><span><span>f your water heater suddenly seems to supply less hot water and you've made sure it isn't leaking, flush the water heater tank to be sure mineral deposits are not reducing the heater's efficiency. To do this:</span><br /></span></span><span>1) Turn off the water heater's gas valve or electrical power.</span><br /><span>2) Let the water cool.</span><br /><br /><span>3) Turn off the water inlet valve and attach a hose to the drain valve to run the water into a large bucket, or to a drain or the outdoors.</span><br /><br /><span>4) Open the drain valve at the base of the tank, and open one hot water faucet somewhere in the house to let in air. When all water has drained from the water heater, turn the cold water valve on and off until the water from the drain runs clear.</span><br /><br /><span>5) Close the drain valve, turn the water back on to fill the tank, and turn the gas valve or electricity back on (relight the pilot if applicable).</span></span>
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
That hose has dual functions; to drain the carb and to safelydivert gas if the float valve fails. Check to make sure the drain screw isn't open or loose. If not check the float and needle. The needle could be deformed as a result of ethenol exposure. Safe riding.
Thought I answered this...Pull off the fuel hoses at the valve and check that flow stops in the off position. Remove the 10mm head sediment bowl and check for dirt/rust. Sounds like 2 float valves are leaking because of dirt or foreign matter. Pull off the float bowl drain hoses on the carbs and loosen or remove the drain screw to check the fuel condition.
It is a vent / overflow hose. It drains to the atmosphere / street. If gas is coming out and isn't stopping then a float is stuck.
Turn off the gas and drain the offending carb(s). Next, turn the gas back on and sharply tap the float bowl with the plastic handle of a screwdriver as the fuel bowl refills. The goal here is to vibrate the float to free it up. If doing this process a couple of times does not free the float I would remove the carb(s) and look for any misalignment of float pin, needle or adjusting tang.
Now re-clean with a spray carb cleaner. Clean the air filter then re-mount carb(s). Next, Remove the water trap bowl at the bottom of the petcock, (gas valve). Dump it, clean it and re-mount it, ( not all bikes have a trap bowl ). INSTALL AN IN-LINE FUEL FILTER..
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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