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According to the specifications section of the shop manual, the standard (behind the seat) tank for F-,C-, and T-Series cab models shows a capacity of 18 U.S. Gallons.
I've never been able to put more than 13 gal. in my '57 F100... and I read some place the tank is suppose to be 16 gal. (?) Did Ford intentionally set the gas gauge so you'd have 'extra' gas when it indicated Empty?...