Question about 2003 Nissan Sentra

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Paid $500 to replace fuel sender unit...made car worse....then they replaced fuel pressure system...made car even worse...now they say my head gasket is blown and wanting me to pay $950...can their mi

2003 nissan sentra has been hard to start, ideling, over heating and heat does not work. The dealership replaced the fuel sensor unit and fuel pressure regulator. They let me drive off the lot twice and my car got worse each time. Now they say it is a blown or cracked head gasket for $954 and I already paid $500. Can there mistakes lead to the head gasket issue>

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  • ponder0423 May 20, 2009

    so if they told me the car was good and ready to go, Let me drive the car off the lot and the car gets worse. Take back and get told it is another issue it "could" be. Again, they call and say car is running smooth and it is fixed. Letting me drive it off the lot again. Only to make my car not start at all.Each time car got worse. Now they want me to pay $950 for a blow head gasket? I just do not think it is fair or good customer service. Should I have to pay for the head gasket, being they missed the main issue twice?

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No their mistakes could not have led to the issue. just their bad diagnostics missed it to begin with. the dealers do not always have the most competent shop. i would usually tell people to stay away from them and use the other shops around. you are not the first that i have heard with problems they cannot diagnose. go get a second opinion from another certified shop.

Posted on May 20, 2009

  • jon fuller May 20, 2009

    things can get missed all the time at shops and yes they will have you pay for the job of doing it. maybe if you take it through court you may be able to get the job done for nothing but plan on spending close to 10k and having it take a year or more to do it. i would again suggest taking it to another shop for a second opinion and having the work done as the dealers mechanics are usually not reliable at all.

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First I suggest, in fuel tank, located the fuel sending unit and...
  1. Check connector at fuel tank for poor connection or signs of corrosion.
  2. Check all fuses in system.
  3. Verify ground circuit at fuel level connector.

If aparently this its ok, them there is a sensor in the fuel tank that goes bad, when it does it can give you a erratic readings. The fuel level sensor is mounted to the fuel pump but can be replaced by itself.

Fuel Level Sensor Replacement - Removal Procedure

Important: Always maintain cleanliness when servicing fuel system components.

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Fuel Sender Assembly Replacement
Removal Procedure

Caution: Fuel Vapors can collect while servicing fuel system parts in enclosed areas such as a trunk. To reduce the risk of fire and increased exposure to vapors:
• Use forced air ventilation such as a fan set outside of the trunk.
• Plug or cap any fuel system openings in order to reduce fuel vapor formation.
• Clean up any spilled fuel immediately.
• Avoid sparks and any source of ignition.
• Use signs to alert others in the work area that fuel system work is in process.

Notice: Clean all of the following areas before performing any disconnections in order to avoid possible contamination in the system:
• The fuel pipe connections
• The hose connections
• The areas surrounding the connections

Important: Always maintain cleanliness when servicing fuel system components.

Remove the fuel tank. Refer to Fuel Tank Replacement .
Disconnect the fuel tank pressure (FTP) sensor electrical connector.
Remove the fuel tank pressure sensor.
Disconnect the fuel sender electrical connector.
Clean the fuel pipes, and fuel sender assembly to prevent possible fuel contamination during removal.
Disconnect the quick-connect fittings at the fuel sender assembly. Refer to Plastic Collar Quick Connect Fitting Service .

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Important: The retaining fuel sender assembly will spring-up when the ring is removed.
Use a breaker bar to unlock the fuel sender lock ring. Hold down the fuel sender and remove the fuel sender retaining ring.
Remove the fuel sender assembly.
Remove and discard the fuel sender seal.
Clean the fuel sender assembly sealing surfaces.
Inspect the fuel sender assembly sealing surfaces.zjlimited_527.gif

Keep in mind that the sensor runs around $120 at the dealership, labor is about $300 depending on the labor cost per hour where you have it replaced at.

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These units are in the tank and must be dropped in order to replace.


WARNING Do not handle the fuel sender assembly by the fuel pipes. The amount of leverage generated by handling the fuel pipes could damage the joints.

  1. Relieve the fuel system fuel pressure, as outlined in the Fuel System Section.
  2. Drain the fuel tank to at most 3/4 of a tank full.
  3. Raise the vehicle.
  4. Remove the fuel tank.
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  6. Note the position of the fuel sender strainer for installation.
  7. Support the reservoir with one hand and grasp the fuel sender strainer with the other hand.
  8. Pull the external fuel sender strainer off of the fuel sender.
  9. Inspect the fuel sender strainer. If the fuel sender strainer is contaminated, the fuel tank should be cleaned.
  10. Discard the fuel sender strainer after inspection.
  11. Disassemble the electrical connectors from the fuel level sensor assembly of the fuel pump and cover assembly.
  12. Disassemble the fuel level sensor assembly.

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    Fig. Fuel level sending unit on fuel sender (fuel pump) module.


To install:
  1. Assemble the fuel level sensor assembly.
  2. Assemble the electrical connectors to the fuel pump and cover assembly.
  3. Position the new fuel sender strainer on the modular fuel sender and push on the outer edge of the fuel sender strainer until the fuel sender strainer is fully seated on to the sender assembly.
  4. Install the fuel sender assembly into the fuel tank using tool J39765 Fuel Sender Locknut Wrench or an equivalent.
  5. Reinstall the fuel tank.
  6. Lower the vehicle.
  7. Add fuel to the fuel tank.
  8. Connect the negative battery cable.
  9. Reinstall the fuel tank filler pipe cap.
  10. Inspect for fuel leaks.
  11. Turn the ignition switch ON for 2 seconds.
  12. Turn the ignition switch OFF for 5 seconds.
  13. Turn the ignition switch ON .
  14. Check for fuel leaks.

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Illustrating fuel pump and sending unit sensor (3) on 1999-2005 4.8L, 5.3L, 6.0L Engines


Removal & Installation
  1. Before servicing the vehicle, refer to the Precautions section.
  2. Remove or disconnect the following:
    • Negative battery cable
  3. Relieve the fuel system pressure.
  4. Drain the fuel tank.
  5. Remove or disconnect the following:
    • Fuel tank
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WARNING Do not handle the fuel sender assembly by the fuel pipes. The amount of leverage generated by handling the fuel pipes could damage the joints.

  • Fuel sender assembly retaining ring using a fuel tank sending unit wrench. Remove the fuel sender assembly and the seal. Discard the seal.
  • Note the position of the fuel strainer on the fuel sender. Support the fuel sender assembly with one hand and grasp the strainer with the other hand. Pull the strainer off the fuel sender. Discard the strainer after inspection. Inspect the strainer. Replace a contaminated strainer and clean the fuel tank.
    • Fuel pump electrical connector
    • Electrical connector retaining clip from the fuel level sensor
    • Sensor electrical connector from under the fuel sender cover
    • Fuel level sensor retaining clip
  • Squeeze the locking tangs and remove the fuel level sensor.
  • Remove the fuel pressure sensor.
  • To install:
    1. Install or connect the following:
      • Fuel pressure sensor
      • Fuel level sensor
      • Sensor retaining clip
      • Electrical connector to the fuel level sensor
      • Electrical connector retaining clip to the fuel level sensor
      • Fuel pump electrical connector
      NOTE Always install a new fuel strainer when replacing the fuel tank fuel pump module.

      • New fuel strainer in the same position as noted during disassembly. Push the strainer on the bottom of the fuel sender until the strainer is fully seated.
      • New seal on the fuel tank
      NOTE The fuel pump strainer must be in a horizontal position when the fuel sender is installed in the tank. When installing the fuel sender assembly, assure that the fuel pump strainer does not block full travel of the float arm.

      • Fuel sender assembly into the fuel tank
      • Fuel sender assembly retaining ring
      • Fuel tank. Install the fuel tank strap attaching bolts. Tighten the bolts to 30 ft. lbs. (40 Nm).
    2. Refill the fuel tank. Install the fuel filler cap. Connect the negative battery cable.
    3. Turn the ignition ON for 2 seconds.
    4. Turn the ignition OFF for 10 seconds.
    5. Turn the ignition ON.
    6. Inspect for fuel leaks

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    1 Answer

    How long does it take to replace both fuel tanks?


    2000 Chevrolet Corvette V8-5.7L VIN G

    Fuel Pump: Service and Repair
    REMOVAL PROCEDURE (LEFT OR RIGHT)
    TOOLS REQUIRED
    ^ J 34730-1A Fuel Pressure Gauge
    ^ J 37088-A Tool Set, Fuel Line Quick Connect Separator
    CAUTION: Refer to the Battery Disconnect Caution in Service Precautions.
    1. Disconnect the negative battery cable.
    2. Relieve the fuel system pressure. Refer to the Fuel Pressure Relief Procedure.
    CAUTION: Refer to Vehicle Lifting Caution in Service Precautions.
    3. Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
    4. Remove the rear wheel and tire assembly.
    5. Clean all of the fuel connections and the surrounding areas before disconnecting the fuel pipes in order to avoid possible contamination of the
    fuel system.
    6. Drain the fuel tanks. Refer to Fuel Tank Draining Procedure.
    7. Remove the fuel tank shield.
    8. Mark or identify each fuel pipe in order to aid in installing the pipes in their original positions.
    9. Disconnect the quick-connect fittings from the fuel sender.
    10. Cap all of the fuel pipes.
    11. Disconnect the fuel sender electrical connector.
    12. Remove the fuel tank strap.
    13. Support the fuel tank.
    14. Remove the fuel sender attaching bolts. Remove previously installed "break-away head" service bolts using a 5/16 inch open end wrench.
    15. Discard the fuel sender attaching bolts.
    16. Remove the float arm retaining clip and the float arm (left fuel sender only).
    17. Carefully remove the fuel sender with the gasket.
    18. Discard the fuel sender gasket.
    19. Clean the gasket sealing surfaces.
    INSTALLATION PROCEDURE (RIGHT)
    CAUTION: In order to reduce the risk of fire and personal injury that may result from a fuel leak, always replace the fuel sender gasket
    and the fuel sender attaching bolts when reinstalling the fuel sender assembly.
    1. Install a new fuel sender gasket on the fuel sender.
    2. Fold the long strainer in half over itself and hold the strainer in this position.
    3. Pinch both strainers upward toward each other.
    IMPORTANT: Do not bend or twist the float arm.
    4. Insert the float arm through the fuel tank opening followed by the folded strainers.
    5. Release the strainers once the strainers are in the fuel tank. The strainers will spring back to their full position.
    6. Continue inserting the fuel sender through the fuel tank opening. It may be necessary to rotate the fuel sender in order to facilitate the installation.
    6.1. Look through the fuel tank opening to ensure that the long strainer is visible.
    6.2. If the strainer is not visible, rotate the fuel sender clockwise and counterclockwise about 90 degrees. Rotating the fuel sender will free up
    the strainer. The strainer should become visible at the tank opening.
    7. Align the fuel sender gasket tab (2) with the fuel sender cover mark (1).
    8. Align the fuel sender cover mark (1) with the fuel tank mark.
    NOTE: Refer to the Fastener Notice in Service Precautions.
    9. Hand tighten the new "break-away head" fuel sender attaching bolts until finger tight.
    IMPORTANT: The upper hex head portion of the fuel sender attaching bolts is designed to shear off of the lower section of the bolt when the
    proper torque is reached. Do not tighten the bolts after the bolt heads have sheared off. A torque wrench or other special tools are not required. Do
    not use thread locking or other types of sealers or lubricants when installing these bolts and gasket.
    10. Tighten the new "break-away head" fuel sender assembly attaching bolts in sequence until the upper hex head portion of the bolts shear off of the
    lower section.
    11. Connect the fuel sender fuel feed pipe (1) (jet pump to left tank) and the fuel feed rear crossover pipe (2) (left tank to jet pump).
    12. Connect the fuel sender electrical connector.
    13. Install the fuel tank strap (3).
    14. Install the fuel tank strap bolts (1,2,4).
    Tighten
    14.1.Tighten the bolt (2) to 25 N.m (18 lb ft).
    14.2.Tighten the bolt (1) to 25 N.m (18 lb ft).
    14.3.Tighten the remaining bolts (4) to 25 N.m (18 lb ft).
    15. Install the fuel tank shield (1).
    16. Install the fuel tank shield mount bolt (2).
    17. Install the fuel tank shield mount nut (3).
    Tighten
    ^ Tighten the fuel tank shield mount bolt to 25 N.m (18 lb ft).
    ^ Tighten the fuel tank shield mount nut to 12 N.m (106 lb in).
    18. Install the rear wheel and tire assembly.
    19. Lower the vehicle.
    20. Refill the fuel system.
    21. Install the fuel filler cap.
    22. Connect the negative battery cable.
    23. Inspect for leaks.
    23.1.Turn the ignition switch ON for 2 seconds.
    23.2.Turn the ignition switch OFF for 10 seconds.
    23.3.Turn the ignition switch ON.
    23.4.Inspect for fuel leaks.
    24. Program the transmitters. Refer to Transmitter Programming/Synchronization in Keyless Entry.
    25. Perform the idle learn procedure. Refer to PCM Idle Learn Procedure.
    INSTALLATION PROCEDURE (LEFT)
    IMPORTANT: Always install a new fuel pump strainer before reinstalling the left fuel sender assembly. A fuel pump strainer that has been
    exposed to fuel will not unfold in the fuel tank and may block full travel of the float arm.
    1. Install a new fuel pump strainer in the same position as noted during disassembly. Push on the outer edge of the strainer ferrule until the strainer
    is fully seated.
    CAUTION: In order to reduce the risk of fire and personal injury that may result from a fuel leak, always replace the fuel sender gasket
    and the fuel sender attaching bolts when reinstalling the fuel sender assembly.
    2. Install a new fuel sender gasket on the fuel sender.
    3. Fold the strainer three times so that the amount of space occupied by the strainer is about equivalent to the diameter of the fuel sender reservoir.
    3.1. Fold the long side of the strainer over (1 over 2).
    3.2. Fold 3 over 4 and hold the strainer in the folded position.
    4. Insert the fuel sender through the fuel tank opening.
    5. Release the strainer once the strainer is in the fuel tank. The strainer will spring back to its full position.
    6. Continue inserting the fuel sender through the fuel tank opening. It may be necessary to rotate the fuel sender in order to facilitate the installation.
    6.1. Look through the fuel tank opening to ensure that the long side of the strainer is visible.
    6.2. If the strainer is not visible, rotate the fuel sender clockwise and counterclockwise about 90 degrees. Rotating the fuel sender will free up
    the strainer. The strainer should become visible at the tank opening.
    IMPORTANT: Do not bend or twist the float arm.
    7. Insert the float and the float arm into the fuel tank opening.
    8. Install the float arm retaining clip.
    9. Align the fuel sender gasket tab (1) with the fuel sender cover mark (2).
    10. Align the fuel sender cover mark (2) with the fuel tank mark.
    NOTE: Refer to the Fastener Notice in Service Precautions.
    11. Hand tighten the new "break-away head" fuel sender attaching bolts until finger tight.
    IMPORTANT: The upper hex head portion of the fuel sender attaching bolts is designed to shear off of the lower section of the bolt when the
    proper torque is reached. Do not tighten the bolts after the bolt heads have sheared off. A torque wrench or other special tools are not required. Do
    not use thread locking or other types of sealers or lubricants when installing these bolts and gasket.
    12. Tighten the new "break-away head" fuel sender assembly attaching bolts in sequence until the upper hex head portion of the bolts shear off of the
    lower section.
    13. Connect the fuel sender fuel feed pipe (1) (jet pump to left tank), the fuel return rear pipe (2), and the fuel feed rear pipe (3).
    14. Connect the fuel sender electrical connector.
    15. Install the fuel tank strap (3).
    16. Install the fuel tank strap bolts (1,2,4).
    Tighten
    16.1.Tighten the bolt (2) to 25 N.m (18 lb ft).
    16.2.Tighten the bolt (1) to 25 N.m (18 lb ft).
    16.3.Tighten the remaining bolts (4) to 25 N.m (18 lb ft).
    17. Install the fuel tank shield (3).
    18. Install the fuel tank shield mount bolt (1).
    19. Install the fuel tank shield mount nut (2).
    Tighten
    ^ Tighten the fuel tank shield mount bolt to 25 N.m (18 lb ft).
    ^ Tighten the fuel tank shield mount nut to 12 N.m (106 lb in).
    20. Install the rear wheel and tire assembly.
    21. Lower the vehicle.
    22. Refill the fuel system.
    23. Install the fuel filler cap.
    24. Connect the negative battery cable.
    25. Inspect for leaks.
    25.1.Turn the ignition switch ON for 2 seconds.
    25.2.Turn the ignition switch OFF for 10 seconds.
    25.3.Turn the ignition switch ON.
    25.4.Inspect for fuel leaks.
    26. Program the transmitters. Refer to Transmitter Programming/Synchronization in Keyless Entry.
    27. Perform the idle learn procedure. Refer to PCM Idle Learn Procedure.

    Jul 06, 2009 | 2000 Chevrolet Corvette

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