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Those cars have a system (returnless) that does not return fuel to the tank. The pressure is regulated by controlling the voltage to the fuel pump. Basically it's a sensor on the injector rail sends a signal to the ECU which sends another signal to the pump module then the pump itself.
Seen them misdiagnosed when the problem was the sensor was not sending the proper signal. Super hard to start cold, but runs fine once you get it running. Very similar to a carb with no choke or accelerator pump.
regards
mech
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