Goldrush is horrible 99% of the time. I play it quite often but you just know it's going to end on the timer and just be a slog no matter which team you're on. I'm not sure how you can fix it, it just doesnt play well between 2nd tank barrier and securing second gold. If the bank doors are still up after 15 minutes the game should just end imo.
I can't speak for fueldump since I can count on one hand how many times I've played it this year because nobody ever votes for it. Not sure why, less of a hell than Goldrush.