</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif"> Jim,You have gas receipts from 1982!!!! </font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I knew I would need them some day and I was right; to prove my '68 holds more than 15 gallons. Actually, I have almost every service and parts receipt on my Firebird since I bought it in May, '69.

I have a couple possible explanations for the different capacities: 1. The fuel sending unit has been replaced and the new one does not reach the fuel in the bottom of the tank. 2. The pumps and environmental filler nozzles at the gas stations shut off before the tank gets full. 3. I heard of people putting bricks in their toilet tanks to save water. Maybe they thought it might help save gas in their car tanks. When you hit a bump do you hear a loud thud? :rolleyes: :rolleyes:

Bottom line: The factory tank and sending unit will allow a 18.5 gallon fill-up. For some reason some cars don't allow it.