Remove the gas cap and that will relieve pressure in the tank. There is a Schroeder valve on the fuel injector rail. Use that to relieve pressure at the injectors.
The schrader valve on the low pressure side of the system.
To relieve excess pressure in cooling system exceeding predetermined value.
Tire pressure 32 lbs. Fuel pump pressure 46lbs.
The low pressure valve is on the side of the accumulator-drier bottle. It is on the passenger side of the firewall.
In a 2002 Escort ZX, the fuel pump has a check valve built into it. If the fuel pressure is dropping, then it is a bad pump. You would need to replace the entire pump. It could also be low compression.
relieve the pressure off the high pressure side
the pcv valve is on the back right of the valve cover if not get one
the recharge valve is the smaller valve on the low pressure side (line). it is located above the dryer and next to the low pressure switch.the valve is on the line right next to the firewall on the passanger side.
First loosen the gas cap and relieve any pressure in the tank. Now look on the fuel rail for a schrader valve and push it to relieve the pressure. It will look like a tire valve. If you find none, then just be prepared for a spray of fuel when you disconnect the fuel line. Wrap it with a rag to prevent the spray.
schrader valve on fuel rail
you can release fuel pressure with the schrader valve (looks like a tire valve) it is located on the passenger side of the fuel rail also, in the trunk you can unplug the fuel reset switch. then start the car and run it until it dies. pressure has been released! simply plug it back in when you want the fuel pump to kick in again. safer then spitting gas over a hot engine...