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In the first SVO systme I built, looping was easy because I used the lift pump for both fuels; it also kept the heat in the oil.
In the system I'm building now, I have a separate pump for the oil, and I'm reluctant to loop the return because I need to bleed the air out. Since I'll have a small SVO tank, I'm just going to return excess oil to the tank and heat the whole tank as I go.
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