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Why do the fins keep.breaking on my fuel pump

(1990 Chevrolet 1500 Pickup)
in Reno, NV on December 25, 2016
If the O2.sensor is bad how would I know
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on December 27, 2016
Search for a video for testing the sensors, there is a little bit too much to it for this message board. For the fuel pump, you may have a dirty fuel tank that allows debris to eat away at the pump.
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