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which is the auxiliary tank and which one is the main. I should know this but it escapes my memory right now. Oh and what is the capacity of each? Thank you so much!
Just went through this debate a couple of days ago. Aft axle tank is the main, midship tank is auxilliary.
Here's the page from my '73 owner's manual.
Here's a link to the other thread: https://www.ford-trucks.com/forums/1...l#post12148892
To answer your question about capacity, to be more accurate we need to know the year, the Model, If it's 4x4 or crew cab, or a super camper special, or if it's got evaporative emissions.
Too many variations in capacity between the trucks, as they can fluctuate as little as .1 of a gallon to several gallons between models.