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Re: Corvette Regulator with a stock 5.3 return line Fuel rail
I figured you had an aftermarket harness or had modified the factory one and it was removed because it isn't needed for the engine to run. The wiring for it will be in the factory harness, but without the fuel tank pressure sensor I'm not sure it will ever get the signal from the PCM to open. The PCM runs a diagnostic on it at certain times to make sure there are no leaks in the EVAP system, and it's what controls the purge solenoid. Some people say it will work without the tank sensor, but I've never tried it.
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