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The oreilly warranty carried many contingencies, this is from their web site:


Fuel Pump Warranty
Fuel pumps carry a limited lifetime warranty when the fuel filter and strainer, if applicable, are replaced with the pump. In order to validate the warranty, O'Reilly Auto Parts and the pump manufacturer(s) require proof of purchase and installation of the filter and strainer; otherwise, pumps installed without the previously mentioned items carry no warranty.