Crazy fuel consumption!

[Bwake]

I just bought a 61 Apache10, 235 ci that hasn't been driven in a long time. I put 2 1/2 gallons of clean gas in the truck to get it home. The truck idled okay but ran very sluggish, poor acceleration. I had someone following me that said they smelled gas pretty bad. When I got home I noticed that the inline fuel filter had quite a bit of rust in it so I pulled the gas tank. The crazy thing is there was only about 1/2 gallon of gas in the tank of the 2 1/2 gallons I put in. I drove less than 20 miles and burned almost 2 gallons of gas. What the heck is going on? There are no obvious leaks. I don't smell any gas while the truck is parked. It has to be more than rust in the tank!
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