I wouldn't. If the line runs all the way back to the tank then there would be no pickup in the tank. So all your genny would do is pump air. I assume it has it's own pump on the generator? If it does, you might be able to get into the primary fuel filter. You'll have to look at the filter base to see if there is another supply port that is plugged. And you might also have to put some check valves in place to keep from sucking the secondary and injection pump dry.
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