Hmm. A bit odd as they are pneumatic, is there a split or a hole in the pipe from the lever to the flush?
What type of fill valve have you got?
I'm not sure on the pipe - having checked it it all seems okay.
From a quick google the one I have matches a float cup fill valve.
@spenceey started
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Hmm. A bit odd as they are pneumatic, is there a split or a hole in the pipe from the lever to the flush?
What type of fill valve have you got?