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Old 03-12-2015, 09:18 AM   #10 (permalink)
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In this type of system, the pressure difference between fuel and inlet manifold is held constant.

There are other - returnless - systems in which the ECU compensates for the pressure difference. The O2 sensor has a lot of influence.

In addition to the effects of altitude and air cleaners of varying flow restriction, fuel pumps and engines vary, perhaps due to wear. The ECU is programmed to compensate.
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