Onchan surprised Ayre United in the GH Corlett Woods Cup preliminary round.
Craig Marsh, Mark Burman, Gerard Colligon and Mark Rees were on target in a 4-2 home win.
Phil Quayle and Elliot Cureton replied for the Tangerines.
Douglas Athletic are up to fifth in JCK Division Two after an 8-1 thrashing of Braddan.
A Josh Green treble, a Liam Dawson double and further goals from Darren Shields, Andy Newton and Stuart Monks (penalty) secured the three points to lift them above Colby in the table.
FC Isle of Man head to Barnoldswick Town for penultimate game of season
Both 'The Ravens' and their hosts looking for improvements this evening (14 Apr)
Hockey: IoM U14 Boys beaten in EH Championship final
Island side narrowly beaten by Guildford in Nottingham
Football: Division 2 promotion rivals to meet in crunch clash
Just two points between premier league title contenders ahead of midweek fixtures
MGP pays tribute following rider's death at Oliver's Mount
Aran Sadler had been due to make MGP debut later this year