Afterwards, Fachie paid tribute to the support of the crowd. He said: 'The atmosphere was electric. The crowd pushed us round that final bend.
'I just can't believe it. To be here winning the gold medal is a dream come true.'
The crowd were great on that last lap. I thought I was dying at that point and it was a big push behind me.Barney Storey
Storey echoed Fachie's appreciation of the Host Nation backing.
He said: 'The crowd were great on that last lap. I thought I was dying at that point and it was a big push behind me so that was great.'
Great Britain's Jody Cundy (4:42.005) and Diego Duenas (4:50.016) reached the battle for bronze.
The equivalent C5 event saw Australia's Michael Gallagher and Great Britain's Jon-Allan Butterworth reach the final after each clocking world records.
Butterworth recorded 4:35.026 before Gallagher beat the mark, clocking 4:30.012.
China's Liu Xinyang (4:35.386) and Yegor Dementyev of Ukraine (4:43.881) reached the bronze ride-off.