The pump in the pic looks very similar to a generic one I put on a neighbor's mule. It was ~$45 versus the ~$220 for a kawasaki version so we gave it a try and it has been working great. We thought we might have to run a separate 12V line to it to make it run but it does fine with the fuel pump relay in the loop. Sounds like the previous owner of your mule had taken many shortcuts to keep it running and you get to enjoy the fruits of his labor.
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