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Put some gasoline in a bucket, put the pump in the bucket and use a 12 volt battery to put the pump on. Use a pressure gauge. Put in the output of the hose from where the gasoline will come, and check how many psi the gauge show, I think it has to be 20 or 40 psi.

I would use kerosene for the test fluid; way less explosive!

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Q: How do you test a fuel pump that has been removed from the tank of a 1990 Isuzu Trooper?
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