Samdayo the FP should come up to ~42 psi within about 2 seconds of turning the key to pos 2.
There is a spec for how long it holds pressure (pressure drop) but in 1 week I would expect the pressure to drop to zero.
Do you know when the fuel filter or pressure regulator was changed ?
Also the FP valve is a standard shrader valve. Like a bicycle valve. You should be able to remove the gauge, then press the relief on the gauge to remove pressure.
ECU controls injectors, not fuel pressure.
Check the filter, regulator, then the FP fuse and relay.
Last edited by Makomagnet; 12-30-2012 at 10:13 AM.