At 08:11 AM 5/22/2008, Mark Thoma wrote...
>One of the things I desperately need to know is the resistance across
>  the fuel level sender when the tank is 'full' and 'empty'.... the
> manual doesn't mention it  anywhere.

Actually, the manual mentions it in the section on checking fuel gauge.
A setting on the VW 1301 tester of 55 should be full, and of 560 should
be empty.

Now, for the first time anywhere, I will reveal the super-secret
formula for converting the VW 1301 tester setting to ohms (I'm serious,
try to find this anywhere else).

It is N/2+10.

So, full is (55/2+10=) 37.5 Ohms and empty is (560/2+10)= 290 Ohms.

Enjoy.