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No, after the overflow is just that, overflow. It is what pressure escapes, or is vented from the gallery, which is controlled by the overflow valve. The picture that was posted shows the one of two places to read the IP gallery/fuel filter out pressure.

Don't just load the parts cannon, troubleshoot it. If there is a restriction, no hard part will fix it. Three check points will give you the 4 readings you need, restriction into the system, lift pump output pressure/FF inlet pressure, FF outlet pressure, (pressure drop across the filter)gallery...

If there isn't enough pressure/flow, but, usually a white smoke, hard start, low power issue is present. Low pressure/flow changes injection timing, retards it, hence the white smoke and makes it so the minimum low pressure isn't there to make the needed high pressure causing a hard start.

If the idle stop turns out OK, you need to check fuel pressure. If there is a restriction or the lift pump is not making the correct pressure your issue can happen, but, it usually accompanied by white smoke and there are power issues. You should check pressure/restriction anyway just so you...

Fuel shut off valve. It's the electric plunger goodie on the side of the pump that pulls in when you start it and extends when the power is off. There are specific measurements for the different types of valves and pumps for pull in. If it does not pull in far enough, the coil will not hold and...

Just thought about something else. If the FSOV is coming apart or not adjusted properly, it can cause the same symptom.

There is an idle stop screw on the back side of the throttle lever. If there has been any kind of an oil, fuel leak there, the liquid acts as a base and dirt will erode, lap, whatever the contact points for that stop. The stop can be adjusted, HOWEVER, if the stop is eroded, the adjustment will...

So it dies if you let off the go pedal or if you bring the rpm down slowly, will it stay running until you fully remove you foot from the pedal? Sincde you stated a new overflow valve, I assume it is an 8.3....