Thanks for the input. I can tell you there is no cross over between the two. I do know with mine, and with my aunt's SIIII the fuel line is in the engine compartment. I looked at the SII that I have, and there is no fuel filter in the engine bay, so it must be like yours where it is in the back.
I have removed the fuel pumps and all the junctions from another spare car, so i will see if I can get some more information that away. My brother suggested that I clamp the hose to the other tank and is if the pump gets up to pressure.
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