Gander, who has been in the post for three seasons, cited increased work and business commitments as the reason behind him leaving his post at Lancers with the new season just two days away.
As well as being chairman, Gander was also manager for seven years, while holding a committee member role with his local team.
Despite his strong links with his hometown side, the former chairman felt this was the right time to walk away.
He said: “I’ve had a great time as chairman of this club but now I feel it’s the right time to step away.
“My work commitments are increasing, while I also have roles with both Sussex FA and within the Southern Combination League.
“It was getting to a stage where I just could not give the time that was necessary and it wasn’t fair on the club.
“This was not an easy decision for me after being involved here for such a long period but now is the right time for someone else to give it a go.”
Lancers had one of their most successful campaigns in recent history last time out, finishing fourth in Southern Combination League’s Premier Division, while also ending a 26-year wait for silverware lifting the Peter Bentley Cup.
Gander felt that was great to be a part of and sees no reason why boss Ash Bailey can’t achieve similar success this season.
He added: “When Ash was given the job after Richard Whittington left last season everyone was expecting us to fall away.
“Full credit to Ash, though, he’s a young, hungry manager who done a great job here last season.
“With what he’s managed to get in over the summer, I see no reason why they can’t achieve the same, if not better, this season.”
Gander hopes to get to some Lancing games this season but he admits that may be tricky as he plans to watch several Liverpool games at their Anfield home.
He said: “I’m going to watch a lot of Liverpool this season but will try and get back to some Lancing games.
“With me not being able to get to Lancing on some Saturday’s it was just the right time to take a break for me.”
Lancing released a club statement revealing they had reluctantly accepted Gander’s resignation, with current secretary John Rea taking up position as chairman temporarily until a permanent successor is found.
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