One thing I didn't care about in my swap (2007 5.3 LMG in 1997 2dr 4wd Tahoe)
is the fuel level sensor. I had to built a new connecting rod for the level sensor, 'cause the '97 Tahoe's gas tank is a lot deeper than the 2007 composite tanks.
I also had to modify the fuel pump module to fit that deep tank.










The manual states 40ohms resistance for a full tank and 250 ohm resistance for the empty tank. The E38 sees 5V for the empty tank and 0V for the full tank. In my 1997 Tahoe gas tank I could manage to have 250ohms empty and 50ohms full.... not exact but close to the spec.

Then I looked up the calibration in EFIlive : There is F0504 which is the tank capacity in liter and F0505 as sensor calibration.
I have F0504 113l. When I read those values with the scan tool:



I recieve 0.8V for a full tank. Seems ok so far but what seems strange to me is I read 99l as Fuel tank rated capacity GM.FTRC although I programmed F0504 113l in the tune tool.



any ideas? Did I miss something?
best regards from Germany

Harald