Question about 1983 Mercury Grand Marquis

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No fuel pressure on the fuel rail - 1983 Mercury Grand Marquis

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  • dennis kelsey Jan 18, 2013

    no fuel pressure on fuel rail was fixed by replacing the fuel pump. all went well till i put the tank back on the hanger straps, those dumb engineers who designed the hanger bokts made them too short,making the tank hanging areal difficult. thanks for the fuel pump tip

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  • Mercury Master
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No fuel pressure could be stopped up fuel filter or faulty fuel pump.

Posted on Jan 15, 2013

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Location of fuel pressure valve on fuel rail buick rendevoues 2002


I don't believe you have one. If it isn't on the fuel rail, I did look at your fuel rail in database, didn't see schrader valve. On these vehicles you tee into the supply line to check fuel pressure. You need fuel gage and proper fittings. Don't take a fuel line loose unless your sure no pressure on the system.

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My code on the 2005 ford mustang said that my fuel rail pressure sensor A Circuit


Does the Vehicle start an run ? What engine does it have ? 4.0 or 4.6 L You vehicle has electronic returnless fuel system , Fuel rail pressure sensor , FPDM - fuel pump driver module . The fuel pump driver module controls the fuel by pulse width modulation
Pulsewidthmodulation (PWM) is a powerful technique for controlling analog circuits with a processor's digital outputs. PWM is employed in a wide variety of applications, ranging from measurement and communications to power control and conversion. The PCM - engine computer uses the fuel rail pressure sensor input to send commands to the FPDM .
What code ? P0--- what ?



P0190 - Fuel Rail Pressure (FRP) Sensor Circuit Malfunction Description: The comprehensive component monitor (CCM) monitors the FRP sensor to the powertrain control module (PCM) for VREF voltage. The test fails when the VREF voltage from the PCM drops to a voltage less than a minimum calibrated value. Possible Causes:
  • VREF open in harness.
  • VREF open in sensor.
  • Vacuum leaks.
Diagnostic Aids: Verify a VREF voltage between 4 and 6 volts. Application Key On Engine Off Key On Engine Running Continuous Memory Fuel rail pressure temperature (FRPT) sensor - GO to DD26 GO to DD26 Fuel rail pressure (FRP) sensor only - - GO to DD1 Fuel rail pressure (FRP) and fuel rail temperature (FRT) sensors - - GO to DD1


P0191 - Fuel Rail Pressure (FRP) Sensor Circuit Performance Description: The comprehensive component monitor (CCM) checks the FRP for acceptable fuel pressure. The test fails when the fuel pressure falls below or exceeds a minimum/maximum calibrated value for a calibrated period of time. Possible Causes:
  • High fuel pressure.
  • Low fuel pressure.
  • Damaged FRP sensor.
  • Excessive resistance in the circuit.
  • Vacuum leaks.
  • Low or no fuel.
Diagnostic Aids: A FRP PID value during key on engine running (KOER) of 138 kPa (20 psi) to 413 kPa (60 psi) is acceptable. Application Key On Engine Off Key On Engine Running Continuous Memory Fuel rail pressure temperature (FRPT) sensor GO to DD34 Fuel rail pressure (FRP) sensor only GO to DD9 Fuel rail pressure (FRP) and fuel rail temperature (FRT) sensors GO to DD9


P0192 - Fuel Rail Pressure (FRP) Sensor Circuit Low Input Description: The comprehensive component monitor (CCM) monitors the FRP sensor circuit to the powertrain control module (PCM) for low voltage. If voltage falls below a calibrated limit for a calibrated amount of time during testing, the test fails. Possible Causes:
  • FRP signal shorted to SIG RTN or PWR GND.
  • Damaged FRP sensor.
Diagnostic Aids: A FRP PID value during the key on engine off (KOEO) or key on engine running (KOER) less than 0.3 volt indicates a hard fault. Application Key On Engine Off Key On Engine Running Continuous Memory Fuel rail pressure temperature (FRPT) sensor GO to DD26 GO to DD26 GO to DD39 Fuel rail pressure (FRP) sensor only GO to DD1 GO to DD1 GO to DD14 Fuel rail pressure (FRP) and fuel rail temperature (FRT) sensors GO to DD1 GO to DD1 GO to DD14


P0193 - Fuel Rail Pressure (FRP) Sensor Circuit High Input Description: The comprehensive component monitor (CCM) monitors the FRP sensor circuit to the powertrain control module (PCM) for high voltage. If voltage exceeds a calibrated limit for a calibrated amount of time during testing, the test fails. Possible Causes:
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  • FRP signal open.
  • Damaged FRP sensor.
Diagnostic Aids: An FRP signal high condition can be caused by any number of conditions, including a short on FRP signal to VREF, a more positive voltage level, an open FRP signal or signal return. The FRP signal line is pulled up by the PCM and VREF at the sensor, and down by the sensor through SIGRTN. Application Key On Engine Off Key On Engine Running Continuous Memory Fuel rail pressure temperature (FRPT) sensor GO to DD26 GO to DD26 GO to DD39 Fuel rail pressure (FRP) sensor only GO to DD1 GO to DD1 GO to DD14 Fuel rail pressure (FRP) and fuel rail temperature (FRT) sensors
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Where is the fuel rail pressure sensor located on a mercury mainer, 2004


What year ???? Didn't make this vehicle till 2005 ! What engine ? 2.3 or 3.0 L
Item Part Number Description 1 9E498 Fuel rail pressure and temperature sensor vacuum hose 2 14A464 Fuel rail pressure and temperature sensor electrical connector 3 W705870 Fuel rail pressure and temperature sensor bolt (2 required) 4 9G756 O-ring seal 5 9G756 Fuel rail pressure and temperature sensor

05 mercury mariner fuelrail pressure sensor-5jdcehjhgz2mhd01rqif5yvo-3-0.gif

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Where is the fuel pressure regulator located?


The regulator is attached to the fuel rail, under the fuel rail cover. Here is a drawing... it is item #4. The drawing is an exploded view - follow the trace-line from the part to the rail cross-over and you see where it connects. Here is the R/R procedure from AUTOZONE....

  1. Disconnect the negative battery cable.
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  3. Remove the fuel rail cover.
  4. Remove the fuel rail.
  5. Remove the fuel tube bracket attaching screw, then remove the bracket.
  6. Unfasten the pressure regulator attaching screw and separate the regulator from the fuel rail assembly.
  7. Remove the fuel outlet tube retaining clip, then remove the tube from the pressure regulator.
  8. Remove the pressure regulator inlet and fuel outlet tube O-rings, then discard.
  9. Inspect the filter screen for contamination. If contaminated, replace it with a new one.
To install:
  1. Lubricate the new pressure regulator inlet and outlet tube O-rings with clean engine oil and install.
  2. Install the fuel outlet tube into the regulator and install the retaining clip.
  3. Push the pressure regulator into the fuel rail and install the retaining screw. Tighten the screw to 89 inch lbs. (10 Nm).
  4. Install the fuel tube bracket and retaining screw. Tighten the screw to 44 inch lbs. (5 Nm).
  5. Install the fuel rail assembly.
  6. Connect the negative battery cable.
  7. With the engine off, turn the ignition switch to the ON position for 2 seconds, then turn it to the OFF position for 10 seconds. Again turn it to the ON position and check for fuel leaks.

Hope this helps!

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(13) Install Fuel Pressure Regulator onto Fuel Rail & tighten Engine Fuel Return Pipe nut to 13 ft-lbs (17 Nm). (14) connect Fuel Pressure Regulator vacuum line, (15) Install Fuel Pressure Regulator attachng screw & tighten to 76 in-lbs (8.5 Nm). (16) Inspect & verify that retainer & spacer bracket is engaged in the slots on the fuel rail. Grasp & pull on the Fuel Pressure Regulator.
to ensure that the Fuel Pressure Regulator is properly seated. (17) inspect for fuel leaks with this
procedure: On 2sec,(holy rollers), off 10sec will be left on, inspect for leaks while running.

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