finding a vacumn leak, and a vacumn diagram for this jeep

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When cruse control is on and traveling at highway speeds and going up a hill there is additional loads on the engine. The air conditioner reverts to the default setting and blows thru the defrosters. I have an obvious vacumn leak. I checked the whole engine compartment and vacumn canister and found no obvious leaks. The transfer to inside air and out side air seams to work fine. I think it is in the dash somewhere but can not find it easily without taking the whole dash out. Is there a vacumn line going to the fuel pump, and does anyone know of an easy way to find where the real leak is? Please help.