Sorry, I don't have time to answer questions. A quick explanation of my W123 wagon design and its function. It really works! Heating the fuel just outside the tank and boosting it forward with an auxiliary electric fuel pump is the only way to go for a single tank system. For more info: https://mercedessource.com/stoe/svo-wvo-fuel-system-sump-heater-and-fuel-boost-pump-used
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