My OBD shows that I have low fuel pressure in a 1997 Ford Mercury (tracer). Do I have to replace the fuel pump? If so, do I have to replace the whole thing or is it enough to replace just the motor unit? What else might cause low fuel pressure reading?
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Generally speaking (not familiar with that model), it could be due to:
The 97 Mercury Tracer doesn't use a Fuel Rail Pressure sensor and any reading you're getting from your OBD2 application is false.
If you believe that the fuel pressure is low, hook up a fuel pressure gauge and verify before replacing anything.
Refer to Brian Knoblauch's answer for potential causes.