1979 733i fuel tank ? gallons

does anyone happen to know how much gas a 1979 bmw 733i can hold? i am not sure if my gas gauge is broken or not. im guessing its aroung 25 gallons.

thanks

i have been searching the internet forever and i cant find the specs on the 79 733i. does anyone happen to have them or know where i can find them?

(the hp, gas mileage, 0-60 speed....)

thanks