The sender is accessed from the top of the fuel tank - behind the panel
in the front of the trunk.

Suggest you first consider an algaecide or other fuel system cleaner,
especially if the car isn't being regularly driven. 100% Biodiesel
cleans out the fuel system - into the filters.

Of course the sending unit may just be worn out.

Don't put gas in a deisel.

Don't use gas if you want to keep your engine. You can use kerosene, but
it's safer to use the fuel additives you can find in the local Mega-Low
stores. They have the algaecide that will clear up the green goop that grows
in diesel fuel and makes your fuel gauge lie to you. Instead of using the
recommended rate (32 oz per 100 gal), put the full quart into your next
fill-up. Do that for the next three or four tanks. I keep a bottle in the
trunk all the time. When I fill up, I pour in about 8 oz. Keeps the problem
under control, most of the time.

Of course, the sending unit may just be worn out.

Larry
In the back yard, under the oak.

Is it the same reason for the same problem on a petrol powered model and
does the solution for the diesel powered model also apply?
                                         Mort