wayne is right ! Clean the flout needle seat and make sure your float is adjusted properly like he says . Also make sure the float , floats and isnt covered in crud or leaks . I like useing a brass brush to remove old caramel oating from it but thats just me . Put it in a spray paint can cap of gas to make sure it floats . Shake it and listen to see if it has liquid in it . Most likley you have a dirty seat .