Hopper tank, approx. 68 ml In many cases the engine setting alters as the fuel level in the tank runs down; i.e. the mixture \"leans out\". This effect can be cured by installing this small hopper tank (as well known as surge tank), which guarantees a reliable, constant flow of fuel, especially during aerobatics. The hopper tank should be installed at the height of the carburettor; it is supplied complete with accessories and holder. Hopper tank, approx. 68 ml complete with accessories for methanol dimensions approx. 69 x 29 x 41 mm