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Yes In the trunk of some of the Crown Vics there is a switch next to the air ride control. It is called an Inertia switch and has a reset button. If you do not find this switch in the trunk, you will find it behind one of the kick panels above the front seat floorboard. It will sometimes activate by mistake with an impact.
The fuel pump relay should be in a Relay trio that is piggy-back to the Powerbox under the hood on the driver's side. There are plastic clips on one end which when pressed will allow the Relay trio to slide out of the case and towards the engine.
The PCM does not supply voltage directly to the fuel pump. It controls the fuel pump relay that dupplie the power to the fuel pump.
The first thing you need to do is make sure there is 12 volts at the fuel pump fuse.
If there is make sure there is 12volts at two of the pins at the fuel pump relay.
If that checks out than you need to start looking for corroded wiring between the relay and the fuel pump. Corrosion = resistane which = voltage drop.
Let me know what you find and i'll be happy to help you further.
does the car ever run low with fuel? this can cause the pump to go in them completely or pick up dirt from the bottom and pump it through and clog injectors up. as for the relay things like fuel pump are normally in the main fuse box under the bonnet it should be a 5 pin 30amp relay. and it should like like the rest of the relays. try swapping a few around if you cant locate the one that says it if you have your manual it should help isolating which one the actual relay is
It could very well be that your fuel pump went bad. I am more inclined to say that the in tank fuel pump would go before before the relay . But you should find the fuel pmp relay under the hood near the main fuse box, if not in it.