A snowmobile frame includes a tunnel, an engine cradle, a front suspension, a forward support and a fuel tank having a lower and an upper wall connected together 5 to enclose a volume. The volume fluidly communicates with the engine and has a portion extending upwardly and forwardly from the tunnel to the forward support. The fuel tank is removably connected to the tunnel and the forward support by the upper wall which has a left and a right lower end portion respectively connected to the tunnel on a left and right side of the longitudinal centerplane, and an upper end 10 portion connected to the forward support. The lower wall is connected to the upper wall above lower end portions and below the upper end portion. A force transmitted between the forward support and the tunnel, via the fuel tank, is transmitted through the upper wall without passing through the lower wall.