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do you have any sort of heater on your tank? i cant imagine the tank itself getting to 160ish temps on its own. also, where do you get your veg oil from?
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I do now, but I ran for well over a year with unheated veggie, that's the reason I was cutting it with B99 during the colder months. Last fall I put a 110 gallon tank in the bed with a <font color="blue">HOT FOX</font>
heated pickup and a hose in hose heat exchanger. It doesn't do much for heating what's in the tank but by the time it gets to the engine compartment it is between 160º and 180º
As long as your oil is warm enough to go thru the pump and filter it will pick up enough heat while its in the fuel rails to inject properly. That is if you let the engine come up to temp so that there is enough heat in the heads that will transfer to the oil. Your water temp is a pretty good indicator.