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There is not much to go on here. Is it belching fuel back out of the fuel tank when your putting gas in. If so, there is a vent tube that goes down into the tank and if it is out of place, the tank can't get air while your fueling. Check your fill tube.
The fuel tank vent is located on the right side of the fuel
tank next to the right rear rubber element. With the fuel
tank empty and the fuel hose disconnected at the
carburetor, remove the two rear rubber elements. Separate the rear of the crankcase and the fuel tank enough to expose the fuel tank vent. Working through the fuel filler opening, grasp the fuel tank vent tube with a pair of needle nose pliers. Push the vent out the other side.
For access to the right side rubber elements, first remove the chain brake cover, bar, chain, chain catcher and cover plate.
For access to the left side rubber elements, remove the starter housing.
Install the fuel tank vent using a drift the same diameter
as the vent tube. The remainder of assembly is the
reverse of disassembly.
You don't say what kind of bike or give any other details so I will go with the obvious stuff first, I am guessing you might not ride it often or let it sit up for awhile. Gas pouring from the vent indicates that a float valve is stuck or the needle valve or seat seal has dried up and has fuel being forced around them as the fuel pump pressurizes the carbs. It is dangerous to run the engine with overflow as you could have a fire so your remedy will require you to pull the carbs to fix the problem.
I think that you have a defective gas tank lid that is not venting properly which could pressurize your system and cause problems. Invest in a replacement and hopefully this will solve your problem. The cap has a small breather vent cover [it sort of looks like a small mushroom], this allows air to enter the tank, but keeps air/fuel from going out of the cap. Some mowers use a pressurized system, and I am not sure if Bolens is one of them.
Fuel tank assembly (with fuel vapor vent valve) (9K007)
Fuel tank assembly (without fuel vapor vent valve) (9002)
Fuel vapor control valve (9B190)
Fuel vapor vent valve (9B593)
Liquid/vapor fuel discriminator (9G332)
On-board refueling vapor recovery (ORVR) T - connector assembly (9S314)
For additional information on the Evaporative Emission (EVAP) System, refer to Section 1A .
For additional information on the Evaporative Emission System Monitor, refer to Section 1A .
Pinpoint Test Schematics
The fuel filter is located just after the gas tank at the back. The filter is fitted to tube with standard tube fittings. You may also want to check the vent of your tank. You may just be having a plugged tank vent.
there is a vent tube that runs along side the fuel tank fill pipe, this tube allows air to went out as fuel is put in,if it kinks (it is very soft thin plastic tube) then u end up with your problem, replace the vent tube, the fill pipe and vent tube come as one part.