The invention relates to an installation (1) for feeding a gas-consuming member (3, 4, 5) with combustible gas and for liquefying said combustible gas; the installation (1) comprising: - a leaktight and heat-insulating tank (2); - a forced vaporization device (10) comprising: - a vaporization chamber (13, 14) intended to be in contact with the combustible gas; and - an inlet circuit (1 1) arranged to withdraw a liquid-phase combustible gas stream from the tank (2) and vaporize it in the inner space (15) of the vaporization chamber (13, 14); - a heat exchanger (20) comprising a first channel (25) connected to the vaporization chamber (13, 14) so as to heat the combustible gas that has been vaporized in the vaporization chamber (13, 14); - a compressor (27) which is connected to the first channel (25) of the heat exchanger (20) and to a three-way connector (29) that is capable of conveying a first portion of the combustible gas stream to the gas-consuming member (5) and a second portion of the combustible gas stream to the second channel (26) of the heat exchanger (20) in order to cool the second portion of the combustible gas; and - an expansion device (33) that is connected upstream to the outlet (26b) of the second channel (26) of the heat exchanger (20) and is connected downstream to a return circuit (34) leading to the tank (2).