Quote:
Originally Posted by jonzobot
I have a link but I have too few posts! But anyway, check out tercelreference[dot]com, it is a good site (created by none other than Daox) and shows that 1997+ models have the returnless system.
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Yah, I don't see anything on that vacuum diagram that would cause fuel pressure to be referenced to intake vacuum.
I am also thinking that this returnless system does the same thing as the Chrysler returnless system does - the fuel pump is a simple electric pump which is energized for a couple of seconds when the ignition key is turned, and is also energized when the engine computer senses that the engine crankshaft is turning. The fuel pump output then goes through a fuel pressure regulator which regulates the pressure down to a constant 48 psig. Pretty simple system, and easy enough for the engine computer to compensate for. Only real difference would be that the Chrysler returnless system is set to 58 psig, instead.