Whirlpool Dishwasher Leaking

My dishwasher has been leaking for some time I have just discovered. When I run it the water streams what seems to be in the direct center under the sump assembly. Do I replace just the sump or the sump and the motor assembly together? I saw that there are special clamp down clamps on the motor hose connections. Would I order the whole assembly to make sure I get whatever is leaking?