I was wondering if you can find out information about how much liquid fuel can fit in a 6,000 GAL. tank. Right now I do not have the exact dimensions of this tank but I will have it the 29th of April. Could you please E-mail me and let me know if you can answer this question after I have the correct specifications. Thank you.

If I understand what you want I don't need the dimensions. You said that the tank holds 6,000 gallons. 7.48 US gallons is one cubic foot so 6,000 gallons is  ^6,000/_7.48 = 802.1 cubic feet.