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Reply to "Any interest in coolant tanks or fuel tanks??..."

The lower (balance) hose between dual tanks doesn't need to 2" + unless you are building a race car where you need to fast fill. In either case the upper (vent) hose must also have enough flow for the displaced air. For a street car, safety must also be a priority. In case of a bad accident I would rather have a -16 line severed than a 2"+ line.

Arrange the tanks so the floor of the secondary tank (without the fuel pickup) is about 1" to 2" higher than the primary tank (with the fuel pickup). The primary tank will act like a sump and also have provisions for the sending unit. The top of the tanks should be level. You can also design a small sump into the secondary tank.

For use in a race car, dual tanks with a large lower (balance) hose will act somewhat like one big tank. Driving at a racetrack you are wearing a fire suite and have 15 to 20 seconds to get out (in case of an accident) plus emergency personnel near by. Sorry for the gloom. I know a bit about fire. I designed and developed fire and life safety equipment for over 30 years.

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