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I can also gauge the amount of oil in the tank by judgeing the temperature dif in the AM because the oil will maintain it's temp better than the drum will.
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I'm not following you here, are you saying judging it by the amount of time it takes to heat up in the morning?
Actually doesn't the diesel cut the WVO if it starts clogging up on the filters, versus biodiesel really wouldn't would it?
The hardest thing about implenting that idea would be the valving. You'd have to have diesel going in and return to the WVO tank.
I would just say to cap it off, what gain would it give you? There should be enough flow for the valve to allow fuel back into just the IP's return. I don't see any reason why you would want or need to use the injector return line the way you have it hooked up.