* Yields remain high at short-term debt auction * Stocks fall sharply on aid request hesitation * Analysts say ECB boost could fade if aid delayed By Julien Toyer and Paul Day MADRID, Sept 18 (Reuters) - Investors on Tuesday piled pressure on Spain to request aid and trigger a European Central Bank bond-buying programme seen as inevitable to help the country finance its debts, with the benchmark 10-year bond rising to just over 6 percent. Short-term lending costs fell slightly from last month but remained high at auction on Tuesday, offering little hope the country can finance itself at reasonable levels without seeking assistance. The blue-chip Spanish index Ibex had lost 1.57 percent by...
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