I have not had trouble with this on either of my alumawelds.

My first alumaweld (2001 model) didn't have this but my new one (2004) has an access port in the floor right above the gas tank fuel gauge sending unit. This way you don't have to take up the whole floor to do this repair.

This implies to me that it must be a somewhat common thing to need to replace.

If you are having strife with a home repair, any Alumaweld dealer worth their salt should be able to fix this very easily. Check out the jokers that sponsor this site. (see above) They do good work.

-tony