it will certainly help to have the pump lower than the rest of the loop, but not necessary. The rule of thumb is to have your reservoir as the highest point in the loop... including the radiator.
Originally Posted by samster25
my res is the second lowest point in my loop. its works great. just make sure that the pump has fluid
Originally Posted by transit921
if u had a pump/res combo which i am getting, do you think cause the pump is sitting in the res,i should mount it on top