Dennis,
It should be 19 gallons. I have been filling mine up 5 gallons at a time with a gas can. The car has not been driven yet, only started up for the first time and timed. I have been marking down the fuel gauge readings as I fill it. The results, starting with a brand new empty tank are:
Fuel Needle readings:
5 gallons = E
10 gallons = 1/4
15 gallons = 5/8
20 gallons = F
It took 20 gallons without overflowing. Next time should be at the gas pumps!
