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[T3] FI Fuel Tank restoration - revisited

Hi All...

I've been working on a 70 FI and the tank was so rusty and varnished
that it was restricting fuel flow.

So I decided to restore it with the POR15 tank sealant.  I've done it
with an oval-era tank and it was a breeze.  That tank I redid is
absolutely excellent.

So, I said to myself, it should be that easy again since there can't be
that much difference in the T3 fuel tank.  Right?

evidently...  not so.

I removed the gas tank to clean and prep, no problem, but what I hadn't
noticed in the FI years was not included in the carburetor years.  A
metal cup surrounding the supply and return ports in the bottom of the
tank, just below the sender.

Doing a little investigation I found these in the archives:

So the cup is there only for the FI models evidently.

Here's my question:  Is fuel supposed to be able to go UNDER that cup? 
At this time, I can get my tank to hold water after the cup goes dry.
which will obviously be bad later on, making my tank retain about a
half-tank reserve! 

Can anyone confirm that fuel is or is not supposed to travel under the
cup to empty the tank?

If it is supposed to flow underneath, I'll re-treat the tank for rust (I
have not sealed it yet) and hope that cures it.

If that doesn't work...  how much damage could I do by **carefully**
drilling some vent holes in the cup to allow for flow?


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