The '09 Zuma 125 had the same fuel pump issue, which, as far as I know, has been fixed. I never knew exactly what the problem was. I do know that defective parts can be made in all countries, including the U.S. You will not likely find any Asian scooter, including Japanese, that is of superior quality to Kymco.
I won't spend more on a bike than I think it's worth, but if it's a good deal, I don't seem to have a problem buying bikes I don't need.
2002 Vulcan 750, 2013 Royal Enfield B5
2001 XT225, 2009 Genuine Stella
1980 Puch moped