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Okay, so why can't he use all the fuel? What would be the easy things to test for? It reminds me of a C-150 I had that would quit after you'd burned about half tanks. Turnded out the vent was plugged with a dreaded mud dauber. Vacuum on top of the fuel increased as fuel was used until gravity was no longer able to feed fuel to the motor.
If this is happening to just the front engine, check the vent line by blowing in the vent tube with just the aux tank cap off and listening at the tank. Or, check the length of time required to drain the aux tank via the strainer and compare it to the rear engine. Does all the fuel drain out of the tank?
If none of that helps, we can check more difficult items.
Bob
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