Reply to "Volume of fueltank."

The volume is indeed 21+ gallons but early tanks have a standpipe welded into them, that delivers fuel to a banjo fitting on the top. Some owners of '71-72 Panteras have had rust holes appear in the unrepairable internal standpipe, effectively limiting the gas they can draw out of the tank to wherever the pinhole(s) are. A late tank sender (most'73s and later) with an integral fuel feed cures this problem simply if not very cheaply. The low-fuel warning light is actuated by a contact in the sender so is not easily adjustable, but a bent float arm inside the tank will certainly give all-wrong info on fuel volume! Its also possible to install the sender 'clocked' wrong and if so, the float arm will run into tank baffles, again giving wrong info. By removing the left rear quarter window and the engine covers, the sender can be removed undamaged without removing engine or tank. The plastic float sometimes develops a leak and fuel inside causes gauge errors. Remove the old float and shake it: if you hear sloshing, replace the float; vendors have them in stock and they're cheap.