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"Open loop" is where the electronic parameters are pre defined and do not change while the engine is running. "Closed loop" incorporates an O-2 sensor and continuously monitors the air/fuel ratio (looking at the exhaust gasses) and makes adjustments "on the fly" according to what the O-2 sensor tells the "computer" the engine needs. Both systems have a return fuel line (to the gas tank) so fuel pressure can be regulated. But that's just a guess...but I did stay at a Holiday Inn last night!
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