Fuel guage or sending unit?

[chetgeist]

Last week I filled up with fuel on my way to SPI and about an hour
later the fuel guage would occasionaly flicker between full and 3/4
full. This went on for about half an hour then the needle went to full
empty and has not moved for the last 700 miles. Is this a bad guage or
sending unit or some other problem. All other guages are working fine.
If this is a sending unit does anyone know where to look for the access
panel. My guess is somewhere in front of the night stand between the
twin beds. Has anyone done a replacement on a similar coach?

Chet Geist
1981 FC33 SB, Austin, Texas