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My design concept
Main tank -WVO, holding tank - Diesel.
T the feed just before the primary filter with a 3 way valve. Normally default to main WVO tank. On the way to stop the car for the night, I will press a button in the car and a timer will start. Valve is switched to diesel and the remaining WVO is used up in the IP, filter and hard lines. When I start the car the next day, car will start on and run on diesel for a short time ( whatever diesel is in IP, filter etc ) as the new feed is defaulted to WVO again. I just want to have an electronic circuit to do the timing for me but the timing does not need to be precise.
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