Light a match?!?
..sorry, couldn't resist!
I, personally, haven't come across a manual bilge pump that was very good at sucking air, but I guess that's better than nothing. See how you go with the coloured smoke - and do take video, please.
, the usual course of action if an alarm goes off is to turn off all electrics, lift up the boards, open all hatches, and go sit on the beach for a while.)