freewheeler

In perusing this web page <http://www.dkcustomproducts.com/why-how-to-cool-down-the-twin-cam-engine-part-i-dk-cl-tc-dn-1.htm>, one of the first 5 things to do is raise fuel tank. Simple enough. My question. Why raise rear of the fuel tank? Would that not defeat the purpose of putting air on the...