My 110 Taotoa is leaking fuel from a hose on left side with an open end, as like an overflow hose. Why

The other line goes to the fuel gauge overflow right next to the petcock vacuum line on the tank. Big nipple on petcock goes to fuel line leading between carb 2 and 3. Small nipple on petcock goes to the brass nipple on the front of carb number 2. The other hose hooks up to the nipple coming from the fuel sending unit and routes down below the battery and ends. It's there in case the fuel sending unit leaks the hose will route the gasoline away from a hot engine instead of pouring out right on top of it. The nipple to the fuel sending unit should be positioned pointing directly at the petcock on the bottom of the tank. In case you don't know what I mean by sending unit it's the big round circle on the left side of the bottom of the tank with 2 wires coming from it.

These type of fuel shut offs do not have a manual off position. They are automatically operated by engine vaccuum when working properly. They have malfunctioned and allowed fuel to overflow into the airfilter box(the black box) untill repair time use a long piece of hose to connect the large outlet of each shutoff to eachother or plug the end of two short pieces. The carbs have a drain screw on the very bottom of each facing left , right or straight down. you could also drain the carbs however once the fuel supply is cut to them they should not leak any further. Leave the carb fuel hoses from the tank disconnected. You should drain the tank by siphon and the residual gas that is already in the air box can be drained from the hose on the bottom of the box. This is a mess but once you get all this drained it should stop leaking

The clear one connects to the battery vent connection and vents under the vehicle. The other two likely are overflow hoses coming from the carburetor to prevent engine flooding if the float valve is not sealing well causing gasoline level to get too high. They are open to the air.

Sounds like the carb overflow hose. It it's leaking gas the float in the carburator is stuck and letting too much gas into the float bowl, causing the excess gas to drain from this hose. You will have to remove the carb and set the float to the proper level.

Removal & Installation

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NOTE The fuel filter is either on the left side of the firewall or next to the fuel pump near the left side of the fuel tank.

1. Before servicing the vehicle, refer to the Precautions section.
2. Relieve the fuel system pressure.
3. Remove or disconnect the following:
   
   Negative battery cable Fuel filler cap Fuel lines from the fuel filter Fuel filter from the bracket
   

To install:

1. Install or connect the following:
   
   Fuel filter to the bracket Fuel lines to the fuel filter Fuel filler cap Negative battery cable
   
2. Start the engine and check for leaks.




Fig. Using an open end wrench to push the quick disconnect coupler sleeves back-5-cylinder models
Using an open end wrench to push the quick disconnect coupler sleeves back-5-cylinder models

NOTE The fuel filter is either on the left side of the firewall or next to the fuel pump near the left side of the fuel tank.

1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
2. Relieve the fuel system pressure.
3. Remove or disconnect the following:
   
   Negative battery cable Fuel filler cap Fuel lines from the fuel filter Fuel filter from the bracket
   

To install:

1. Install or connect the following:
   
   Fuel filter to the bracket Fuel lines to the fuel filter Fuel filler cap Negative battery cable
   
2. Start the engine and check for leaks.
   
   

   Fig. Using an open end wrench to push the quick disconnect coupler sleeves back-5 cylinder models
   Using an open end wrench to push the quick disconnect coupler sleeves back-5 cylinder models

NOTE The fuel filter is either on the left side of the firewall or next to the fuel pump near the left side of the fuel tank.

1. Before servicing the vehicle, refer to the Precautions Section.
2. Relieve the fuel system pressure.
3. Remove or disconnect the following:
   
   Negative battery cable Fuel filler cap Fuel lines from the fuel filter Fuel filter from the bracket
   

To install:

1. Install or connect the following:
   
   Fuel filter to the bracket Fuel lines to the fuel filter Fuel filler cap Negative battery cable
   
2. Start the engine and check for leaks.
   
   

   Fig. Using an open end wrench to push the quick disconnect coupler sleeves back-5-cylinder models
   Using an open end wrench to push the quick disconnect coupler sleeves back-5-cylinder models

On these models, the fuel filter is part of the fuel pump assembly. Refer to Fuel Pump removal and installation.

If it is a rubber hose coming from the bottom of the carburetor it is the overflow. If that's the case the needle & seat in the carburetor is bad or has something blocking it from closing. This will allow too much fuel into the carburetor and flood the atv as well as leak out of the overflow. If it is the main fuel supply line from the tank, it will go into a fuel valve located on the left side of the machine (on, reserve, and off). If it is leaking from that hose it can be fixed with a new hose. Let me know if this helps or if you have any other questions, Daniel.

They are fuel overflow hoses, and just hang down under the engine. If they are not vacume or fuel lines, then they must be the overflow pipes, one from each carby.

I am not certain exactly what bike you have so consider the diagram below as generic. Chances are the float needle is sticking open a bit. A bit of trash may be stopping it from closing fully. The overflow hose is where any "excess" gas is dumped. This hose vents to the open air. Be sure to turn off the gas valve (petcock) at the bottom side of the tank when bike is not in use. Please rate my answer. Thanks!

Hi and welcome to FixYa,

Initially and to my knowledge, some of the hoses connected to a carb would be:

• from tank through fuel shutoff valve;
• overflow hose;
• drain hose;
• 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.

Good luck and Thank you for using FixYa. Happy Holidays.

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