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Not sure what your setup looks like, but on mine I have a valve that I can turn to pull from one tank, switch to the second tank when that one is empty and all is well.. I try not to run one dry and then swap to the next though,,, 18 gallons of fuel on one side versus zero on the other never sounded like a good idea to me..
 

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I run into this problem all the time on big rig diesel trucks

Let me give some food for thought

1. tank vents, make sure the vent hose is venting and no kinks, some boats have aftermarket caps and use the cap as a vent by removing a small plug i.e. my rex marine caps

2. If you have a EFI fuel system you will more often than not have a return lines to the tanks thru a tee
Make sure all lines are free flowing

3. Tank line fitting going to the engine sometimes has a fuel check valve in it that can become pluged and its easier to pull from the other tank running it empty
 
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