On a Caddy 4.9, What part of the fuel system hold the fuel pressure when the fuel pump stops?

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The fuel pressure regulator is located by the distributor, and attached to the fuel rail assembly. The system is pressurized upstream of the FPR. The large fuel line comes from the pump, the small fuel line is the return to the fuel tank.

I hope I understood your question and answered it.

FPR by not letting the fuel to return back
and
the fuel pump internals.

As long as the fuel pressure is correct when the engine is running I have never been too concerned with fuel pressure bleed off on an older vehicle.

[This message has been edited by phonedawgz (edited 09-07-2013).]

Thx guys