What does a "cruddy" fuel tank do?

[Tim Holt <holtt@nacse.org>]

I've noticed that my Midget seems to run rough when I get down to about 
1/4 a tank - like it's starved for gas.  I'm guessing we're talking 
about some pipe/tube which goes to the bottom of the tank that has holes 
in it in, or crud/sludge that clogs up things and blocks flow.

Reasonable assumption?

Suggested fixes besides just buying a new fuel tank?

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