I usually suggest getting the OBDII interfaces from Amazon if you are located in the US/North America or in your specific Region/Country. Make sure you choose an interface that indicates that the order will be "Fulfilled by Amazon" otherwise you may be waiting for WEEKS for an interface to arrive from Asia. Ebay is another option, but pay attention where the interface will be shipped from, again weeks for an interface from Asia, so if you can wait and want to try to save some money, go for it, but if you need an interface soon, choose wisely.
Amazon.com: Veepeak mini OBD II OBD2 Scanner Bluetooth Diagnostic Adapter, Car Bluetooth OBD2 OBDII auto scanner, Bluetooth OBD2 scan tool For check engine light & diagnostics-Compatible with Torque Pro: Automotive
http://www.amazon.com/gp/product/B00...dp_o_pC_nS_ttl
BTW, how much fuel is in the tank at this moment? If near 1/4 tank, you can use the Hidden OBC Menu to verify if the pump is the problem based on the fuel level in each side of the fuel tank.