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Q:

what would cause the fuel pump to fail only a few days after replacing it? on 1997 GMC Jimmy

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it's a 1987 GMC Jimmy. The fuel pump has been replaced 3 times w/i the past 4 months. Checked fuel lines. Replaced fuel filter, also.Could it be a short somewhere?
(1) Answer
Check for dirt in the tank. If it looks clean I would go to a different brand pump. You should also check the electrical connector at the pump, make sure it clean, tight, and not burnt.