How do I troubleshoot a fuel gauge error? on 2007 Isuzu Ascender

I have a 2007 Isuzu Ascender that after approximately 30-70 miles on a full tank of gas, the gauge reads empty and the low fuel light comes on. Is this a bad tank sensor? How do I troubleshoot this?

by in San Diego, CA on April 03, 2013
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2 answers
ANSWER by , April 03, 2013
ground the power wire going to the sending unit the gauge should go to full
ANSWER by , April 03, 2013
possible sender failure. may have to replace sender.