man, you were lucky and it is fortunate you are so skilled.
for me, that would end 100 odd pages of great biking reads and all the enthusiasm. Cold
more than one fuel tank problem seen with this bike if i remember?
there should be zero, it is too critical, too dangerous

great that the importers seem to try but in the end, quality control and bits so poor and defective and dangerous, fuck it, no one should sell them
its the old chinabike story STILL
peoples lives are not a numbers game, "only one in ten/twenty has such problems" or such thinking is no good to a dude's wife or family if he just crispied himself on a 100 mile first run
not worth the money saving

good luck from now on mate, the sellers should send you a new tank and $500 voucher as an apology - now I bet they say you voided the warranty