If it was a Vector, they have a lifetime warranty! Return them to the place of purchase & they sent them back to be fixed. I've done this numerous times. Oh, don't worry if you've placed your fav sticker to jazz up that torch; they come back with them.
We use 2500 gallon tanks & gravity. Just get a battery operated timer & ready, set, drip! It make take some tinkering to get the desired end result, but extremely simple for a no power secnario. Remember KISS, keep it simple stupid!:)