2P 20A GFCI TRIPPING please help

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I stepped in behind an other electrical contractor, he did not GFCI water pump on the waterfall, so when i installed 2pole 20A GFCI breaker it trips, part of it i think is he used 1 pole mech timer and used one of the legs to run clock now that i got GFCI breaker it sees unbalanced load. The question is if i switch the timer to 2p timer doesn the timer use of the legs to run clock, and there is no neutral available at the location. Whats the solution
 
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