Could i just fit a one way valve on the cigar hose, problem solved? It will return fuel, but not suck fuel (or air when the tank level is low)?
Also I'm trying without a heat exchanger first. Partly because the 617 engine eats everything, but mainly because it is limited space under the hood. And doesn't the eckes filter (VW oil cooler) heat the oil enough on it's way out?
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