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Message: [QUOTE="TARM, post: 71715, member: 578"] It insures no matter what happens with the lift pumps flow that the most fuel is getting back to the main pump that is feeding the motor. That way only the fuel the motor is actually using is the deficit. With my setup I could technically run a return to the tank from the motor and a separate line back tot he tank from the surge tank but this with the turnover of the lift pump should keep a more consistent fuel temp going to the motor. Obviously if the cooler is not efficient enough and there woudl be a large disparity between the temp exiting the cooler and that of the tank fluid itself then going to the tank might be better. But at that point you then have the issue of if its that inefficient how much help is it to do anything in the first place as far as cooling. Given the performance of v10 or 6.0 coolers on on trans fluid which has far less total volume and is high viscosity and retains heat better so its harder to cool than fuel I am hoping and expecting (finger crossed) that its cooling will take it very close to ambient. The temps we see in tanks are from slow build up of heat and its being retained more than anything. If we can cool that considerably the mixing of the tank fuel with the return in the surge tank should create a fairly stable temp in relation to ambient temps. That is what I have come to with all my thinking and going around in circles and the mouse on the wheel doing over time. LOL I will be testing the temps. I do already have a secondary hose run from the factory return port on the tank's sending unit that is plugged currently. It is routed and zip tied by the surge tank. This way if needed I could use it as the surge return and connect the return lines going in and out of the surge together and have it running to the main tank. Yes I spent way to much time planning and thinking thru all this. :fustrate: [/QUOTE]