NOVELTY - Producing synthetic fuel, comprises: providing glycerol and first fermentation tank (40) with glycerol kinase, supplying glycerol and fermenting it to form phosphoenolpyruvate compound (a); providing second fermentation tank (50) with glycerol dehydrogenase, supplying (a) and fermenting it to form pyruvate compound (b); providing third fermentation tank (60) with pyruvate decarboxylase, supplying (b) and fermenting it to form acetaldehyde compound (c); providing fourth fermentation tank (70) with alcohol dehydrogenase, supplying (c) and fermenting it to form ethanol; and collecting it.    USE - The process is useful for the commercial production of synthetic fuel (preferably ethanol) from bio-diesel by products system (claimed).    ADVANTAGE - The process provides: efficient production of synthetic fuel and other usable by-products; and commercial fuel which produces little or no pollutants and provides an incentive for ethanol and methanol production. The process cuts back on the water needed to complete the fermentation processes as it utilizes glycerol.    DETAILED DESCRIPTION - Commercial production of synthetic fuel from bio-diesel by products system (10), comprises: providing glycerol; providing a first fermentation tank (40) including a glycerol kinase substance; supplying the glycerol to the first fermentation tank, where the glycerol is pH adjusted; fermenting the glycerol with the glycerol kinase substance within the first fermentation tank; producing (a) within the first fermentation tank; providing a second fermentation tank (50) including a glycerol dehydrogenase substance; supplying (a) to the second fermentation tank; fermenting (a) with the glycerol dehydrogenase substance within the second fermentation tank; producing (b) within the second fermentation tank; providing a third fermentation tank (60) including a pyruvate decarboxylase substance; supplying (b) to the third fermentation tank; fermenting (b) with the pyruvate decarboxylase substance within the third fermentation tank; producing (c) within the third fermentation tank; providing a fourth fermentation tank (70) including an alcohol dehydrogenase substance; supplying (c) to the fourth fermentation tank; fermenting (c)with the alcohol dehydrogenase substance within the fourth fermentation tank; producing ethanol within the fourth fermentation tank; and collecting the ethanol produced by the fourth fermentation tank.    DESCRIPTION OF DRAWING(S) - The figure shows the flow diagram for the commercial production of synthetic fuel.    Bio-diesel by products system (10)    First fermentation tank (40)    Second fermentation tank (50)    Third fermentation tank (60)    Fourth fermentation tank (70)