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My 1980 f350 fuel tank is about 13 galllons, was this one half of a two tank setup? What would the other tank hold.
18 and 20 for full length bed, and 16 for the shortbeds... it would seem you aren't getting all the fuel out of the tank if that is all you can ever get in.
Mostly light. Depends what you mean as to heavy, to me, all F150-350 are classified light, as that is their proper designation. 450 and 550 are medium.