Quote:
Originally Posted by rlhay2
A very minor issue. Please forgive the lack of specifics, as it has been 14 years since I have studied fluid dynamics and thermodynamics.
The fluid will expand when it gets warm but the simplest solution is: Just don't fill the tank to the top! Leave a 1/2" air gap at the top and if any pressure is created it will compress the air gap without exerting any significant pressure on the closed system.
I will gladly volunteer to be moved up the list to ensure that all my fellow SVTPerf members receive a solid product! 
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Yes an air space ( not sure only 1/2" would be enough though) will serve as an area for expansion of the fluid by compressing the air and will help keep pressures from climbing as much as they would if the tank was full. However there should still be a "saftey relief valve" in the system for excessive pressure to be vented in the event of a "worst case senerio".
I'm sure in most cases it will not be a problem if the resevoir tank isn't filled all the way but I do think it would be best if there was that extra measure of saftey .