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The ported fitting does not increase the rail pressure, only the flow. It should not affect the FPRV. If the FPRV is leaking, it is not tight or has debris.
 

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Possible plastic return line is cracked, or a injector line is not seated.
 

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There is a plastic return line on each injector, and they connect together to the metal return line.

If the rail was removed, possible one of the injector lines is not seated.
 
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