Fuel Tank Sending Unit Removal

[reitand@xxxxxxxxx]

There was a recent question on here regarding sending units
which has reminded me that I have a few queries of my own on
this topic.

The car in question is a '72 Matador with a pessimistic fuel
gauge (ie. always reads empty).  I'm sure the sending unit
is to blame, but am trepidatious about removing it.  What I
need to know is:

- How exactly is the unit fastened into the tank?
- Can I remove it without dropping the whole tank out of the
  car?
- Assuming the tank is somewhat full (I try to make sure it
  is due to the non-op gauge), will I unleash a raging tidal
  wave of fuel if I do successfully remove the sender?
- Any fuel related precautions that should be taken prior to
  attempting to service the sending unit?
- Should I even bother attempting to clean up/repair the old
  unit, or should I just replace?  If it's the latter...
- Who's your vendor of choice for these units?

Thanks to all who may reply,

Dean Reitan
Calgary, AB, Canada
1972 Matador 2-door, 304

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