How do you change fuel sending unit? - 2002 Nissan Maxima

In most cases, the reason why a gas gauge might stop working is because the sending unit located insider the fuel tank may have worn out. In some cases, this may require you to replace the fuel pump as well, because a lot of times they come with the fuel level sending unit attached. Otherwise, if your car is indeed fuel-injected and you are planning on dropping the fuel tank and changing the sending unit, I would also recommend changing the fuel pump as well, for good measure. I hope this helps! :)

if you take the time to drop the fuel tank you might as well replace the fuel pump module. this will come with a new fuel pump and level sending unit. DO NOT USE AN AIRTEX brand. they will leave you with more problems! Get an a/c delco or delphi pump. make sure to replace the fuel filter at the same time.

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the sending unit can be changed without changing the fuel pump just separate the pump from the sending unit

You won't get power at the sending unit. The sending unit provides a variable ground to the dash unit. Where did you ground the dash unit? If you disconnect the sending unit at the tank and ground the fuel gauge circuit there the gauge should go to full. If if doesn't the problem is between that connector and the place you cheched it before. If it does the problem is with the sender. Occasionally new parts are found to be defective.

The electric pump is attached to the fuel sending unit, located in the fuel tank.



Fig. 1: Exploded view of the fuel pump and related components used on TBI equipped models (click for zoom)



REMOVAL & INSTALLATION

1. Properly relieve the fuel system pressure.
2. Connect the negative battery cable.

Be sure to keep a Class B (dry chemical) fire extinguisher nearby.

CAUTION Due to the possibility of fire or explosion, never drain or store gasoline in an open container.

1. Drain the fuel tank, then remove it from the vehicle. Refer to the procedure found later in this section for details.
2. Using the GM fuel gauge sending unit retaining cam tool No. J-24187, J-36608 (or equivalent) or a brass drift and a hammer, remove the cam locking ring (fuel sending unit) by twisting counterclockwise. With the locking ring released, carefully lift the sending unit from the fuel tank.
3. Remove the fuel pump from the fuel sending unit, by performing the following procedures:
   1. Pull the fuel pump up into the mounting tube, while pulling outward (away) from the bottom support.
      

When removing the fuel pump from the sending unit, be careful not to damage the rubber insulator and the strainer.

1. When the pump assembly is clear of the bottom support, pull it out of the rubber connector.
   

To install:

1. Inspect the fuel pump hose and bottom sound insulator for signs of deterioration, then replace, as necessary.
2. Push the fuel pump onto the sending tube.
3. Using a new sending unit-to-fuel tank O-ring, carefully lower the sending unit/fuel pump assembly into the fuel tank.

When installing the sending unit, be careful not to fold or twist the fuel strainer or it may restrict the fuel flow.

1. Secure the sending unit by turning or driving the lockring clockwise and into position under the tabs.
2. Install the fuel tank assembly to the vehicle.
3. Connect the negative battery cable and check for proper pump operation.

Hope this helps (/remember to rate and comment this).

Fuel sending unit, is in the fuel tank, remove fill tube or hose, remove fuel both fuel tank straps, lower fuel tank with jack, indo fuel line's, remove fuel pump and install new one.

It's in the fuel tank you might have to drop the tank.

1. Relieve the fuel pressure and disconnect the negative battery cable.

2. If not already removed, depress the clips on each end of the rear seat cushion and remove the cushion.

3. If not already done, detach the electrical connector from the fuel pump/sending unit.

4. Remove the attaching screws from the fuel pump/sending unit access cover and remove the cover.

5. Disconnect the fuel supply and return hoses from the fuel pump/sending unit.

6. Remove the attaching screws and the fuel pump/sending unit from the fuel tank.

7. Detach the sending unit electrical connector, remove the sending unit attaching nuts and remove the sending unit from the fuel pump assembly.



To install:

1. Attach the sending unit to the fuel pump assembly and install the nuts. attach the sending unit electrical connector.

2. Install the fuel pump/sending unit into the fuel tank with a new gasket and install the mounting screws.

3. Connect the fuel supply and return lines.

4. Install the access cover and the mounting screws.

5. Attach the sending unit electrical connector.

6. Position the rear seat cushion over the floor, making sure to align the retaining pins with the clips. Push down firmly until the two retaining pins are locked into the rear seat retaining clips.

7. Connect the negative battery cable, start the engine and check for proper system operation and for fuel leaks.

The dealer is changing the hole fuel sending unit where as NAPA is sell you the replacement part to the fuel sending unit. The fuel sending unit has different components and can be replaced, GM Dealers will always replace the whole fuel sending unit and not service the fuel sending unit. Good luck and hope this helps. keep me posted,, be glad to help.

I think you'll find sender & pump are all one assy. What is the reason for changing. If it's the gauge, have you removed, cleaned contacts & re-attached wire plug at pump/sender assy, to see if it would cure your problem? Personally, it's not something I'd want to do twice in a short time, so if I was replacing one (if parts are available to do so) I'd replace the other, unless difference in price was extreme.