Thanks guys, I poured some diesel down the return line and it just went away quite quickly. I did forget to mention one important part, my genny produces 12V so I can't think of any scenario where the engine and genny would be running at the same time.
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.
I didn't re-read it, but plugging your genny fuel return line into the bus engine return line shouldn't create any problems. It's a return line. It doesn't really make any difference if you tap into another return line or create a separate entry port back into the fuel tank.
On the other hand sometimes I'm shooting blanks.
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