[Healeys] Fuel Tank Sending Unit Float?

[ronald-ray at sbcglobal.net (Ron Ray)]

Speaking of fuel tank sending units, if a unit works perfectly, or "perfect"
as defined by something in a British car, but registers empty when installed
in a  tank full of gas, would one assume that the float has a leak?  If so,
how would one repair a hole in an aluminum float?
 
Thanks,
    Ron