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How do i check the fuel sending unit? - 1989 Dodge Ramcharger

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  • Dodge Master
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U remove it from the tank and use an ohm meter

Posted on Feb 03, 2010

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I dropped the tank on my '99 Durango, installed a new fuel pump unit but the fuel gauge still shows empty. How do I troubleshoot?


The fuel gauge is directly controlled by the fuel sending unit inside the fuel tank, it sends a ground return signal back to the fuel gauge. I am assuming of course that your fuel gauge is okay. To test your fuel gauge, connect the wire which goes to the fuel sending unit to chassis ground. Your fuel gauge should respond and indicate Full Tank. If not, there is a broken wire somewhere between your fuel gauge and the sending unit. Before connecting the wire that goes to the sending unit to ground, check it first with a DC Voltmeter, you should be able to read +12volts. Be sure that you turn your ignition switch to it's ON position.

Apr 28, 2016 | Cars & Trucks

1 Answer

Fuel sending unit test and replace


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Jan 13, 2016 | Cars & Trucks

1 Answer

Fuel gauge gmc


It could be a loose connection on the gauge or the fuel sending unit.
The fuel sending unit can get worn and have breaks in the contact area that is used to determine float position to send the fuel level reading to the gauge.
I suspect that you have problem with the fuel sending unit considering that the light is on. I am assuming that the light that is on is the "low fuel light". Check your connections at the sending unit if the connections are secure then I would suggest replacing the fuel sending unit.

Jul 04, 2013 | Cars & Trucks

1 Answer

Replace fuel pump 1993 mazda 323



REMOVAL & INSTALLATION

323, Protege, 520-22 626 and MX-6 and 522-24 MX-3 Models
See Figures 1 and 2

  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.



0900c152802612b0.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig. Fig. 1: Detach the fuel hoses and electrical connections from the fuel pump, then remove the attaching screws and the pump


0900c152802612b1.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig. Fig. 2: Exploded view of the fuel pump assembly for the 323, Protege, 520-22 626, MX-6 and 522-24 MX-3

  1. If not already done, detach the electrical connector from the fuel pump/sending unit.
  2. Remove the attaching screws from the fuel pump/sending unit access cover and remove the cover.
  3. Disconnect the fuel supply and return hoses from the fuel pump/sending unit.
  4. Remove the attaching screws and the fuel pump/sending unit from the fuel tank.
  5. 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.

May 08, 2012 | 1993 Mazda 323

2 Answers

Fuel gage not working. Only a smsll light seen. Does the fuel pump need changing?


As long as the car is running fine it's safe to say the fuel pump does not need to be replaced. However the fuel tank sending unit may need to be replaced assuming the fuel gauge itself isn't at fault. First check your owners manual if available for your fuse block info and check fuses then I'd look into the sending unit. Let me know if you need help with that

Nov 29, 2010 | 1995 Volvo 940

1 Answer

How do i replce the fuel pump


  1. Properly relieve the fuel system pressure.
  2. Connect the negative battery cable.
  3. Drain the fuel tank, then remove it from the vehicle. Refer to the procedure found later in this section for details.

    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.

    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 locking 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.
NOTE: A special tool is usually available to remove or install the fuel pump locking cam
A brass drift and a hammer can be used to loosen the fuel pump locking cam
Once the locking cam is released it can be removed to free the fuel pump

Sep 24, 2010 | 1999 Oldsmobile Bravada

1 Answer

The low fuel light stays on even when tank is


Hi: Your Fuel Level Sending Unit That Is Located in Your Fuel Tank Is Probally Bad. BUT before you go to taking the Sending Unit out Of your Tank Check to see if ALL Connections To And From Tank to Gauge are Conected Good. Also You could have a Fuse that Goes to the Sending Unit,in Your Fuse Block.Check And See if You Have A Fuse Labeled Fuel Sending Unit or Fuel Sensor. If you end up Replacing The Fuel Tank Sending Unit Run Your Gas Tank Down To Almost Out Of Gas Before You Start to Remove The Metal Straps Holding Your Tank Up. Cause The Sending Unit Is on Top of Your Tank ,And Your Fuel Pump Is In The Gas Tank As Well. Hope This Has Helped You Please Send Me a Vote on How my Solutions Have Helped You And Also You Can Send Me A Testamony Thank You From the WYOCWBOY

May 31, 2010 | 2005 Chevrolet Impala

1 Answer

Do you have to drop the tank to change the fuel pump on 93 plymouth voyager or is there a way from the top?


Yes the tank must be removed

Fuel Pump: Service and Repair
WARNING: The fuel system is under constant pressure, even when the engine is OFF. Always release fuel pressure before servicing any fuel
system component.
FUEL PUMP REMOVAL
1. Release fuel system pressure.
2. Fuel tank must be removed prior to fuel pump service.
3. Using a hammer and a brass drift, carefully tap the fuel pump lock-ring counter-clockwise to release the fuel pump.
4. Remove the fuel pump and its O-ring from the fuel tank, and discard the old O-ring.
5. Cover tank openings to prevent dirt from entering system.
FUEL GAUGE SENDING UNIT REMOVAL
1. Gently bend the sending unit locking tabs away from the sending unit.
2. Remove the electrical connector cover (red). Remove the sending unit wires from the electrical connector.
3. Use one screwdriver to push on the fuel pump body, and use another to release the sending unit locking tab from the sending unit.
4. Slide the sending unit assembly off of the fuel pump reservoir housing.
5. Pull the wires through the reservoir body and fuel pump cover plate.
FUEL GAUGE SENDING UNIT INSTALLATION
1. Bend the sending unit wires and lay them into the slot on the back of the sending unit.
2. Slide the sending unit into the slots on the fuel pump reservoir body. Slide the wires through the triangle shaped hole in the fuel pump reservoir
body. Check that the tab in the fuel sending unit locks into the detent in the fuel pump reservoir body.
3. Slip the wires onto the tab of the fuel pump reservoir body.
4. Slide the sending unit wire terminals into the electrical connector. Install the terminal locking cover.
5. Slide the fuel sending unit electrical connector into the bottom of the fuel pump electrical connector. Check that the connectors are securely
attached and fully pushed into each other.
FUEL PUMP INSTALLATION
1. Wipe seal area of tank clean, and install a new O-ring seal on pump.
2. Position fuel pump module in tank and secure with the lock-ring.
3. Using a hammer and a brass drift, carefully tap the fuel pump lock-ring clockwise to lock the module in place.
NOTE: Do not overtighten the lock-ring, because the fuel pump seal could split and leak.
4. Install fuel tank assembly.
NOTE: ASD and fuel pump relays remain energized for 7 minutes during the following test, unless the test is stopped or the ignition switch is
turned to the OFF position.
5. Using scan tool, place ignition switch in "RUN" position and use Actuate Output Test "Auto Shutdown (ASD) Relay", to activate fuel pump and
pressurize system.
6. Check for leaks.

Sep 10, 2009 | 1993 Plymouth Voyager

1 Answer

How do i replace the fuel pump in my 1993 mazda 626 2.5


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.

Jun 13, 2009 | 1993 Mazda 626

1 Answer

Fuel sensor


  1. Release fuel system pressure.
  2. Fuel tank must be removed prior to fuel pump service.
  3. Using a hammer and a brass drift, carefully tap the fuel pump lock-ring counter-clockwise to release the fuel pump.
  4. Remove the fuel pump and its O-ring from the fuel tank, and discard the old O-ring.
  5. Cover tank openings to prevent dirt from entering system.


FUEL GAUGE SENDING UNIT REMOVAL

  1. Gently bend the sending unit locking tabs away from the sending unit.
  2. Remove the electrical connector cover (red). Remove the sending unit wires from the electrical connector.
  3. Use one screwdriver to push on the fuel pump body, and use another to release the sending unit locking tab from the sending unit.
  4. Slide the sending unit assembly off of the fuel pump reservoir housing.
  5. Pull the wires through the reservoir body and fuel pump cover plate.


FUEL GAUGE SENDING UNIT INSTALLATION

  1. Bend the sending unit wires and lay them into the slot on the back of the sending unit.
  2. Slide the sending unit into the slots on the fuel pump reservoir body. Slide the wires through the triangle shaped hole in the fuel pump reservoir body. Check that the tab in the fuel sending unit locks into the detent in the fuel pump reservoir body.
  3. Slip the wires onto the tab of the fuel pump reservoir body.
  4. Slide the sending unit wire terminals into the electrical connector. Install the terminal locking cover.
  5. Slide the fuel sending unit electrical connector into the bottom of the fuel pump electrical connector. Check that the connectors are securely attached and fully pushed into each other.
FUEL PUMP INSTALLATION

  1. Wipe seal area of tank clean, and install a new O-ring seal on pump.
  2. Position fuel pump module in tank and secure with the lock-ring.
  3. Using a hammer and a brass drift, carefully tap the fuel pump lock-ring clockwise to lock the module in place. NOTE: Do not overtighten the lock-ring, because the fuel pump seal could split and leak.
  4. Install fuel tank assembly. NOTE: ASD and fuel pump relays remain energized for 7 minutes during the following test, unless the test is stopped or the ignition switch is turned to the OFF position.
  5. Using scan tool, place ignition switch in "RUN" position and use Actuate Output Test "Auto Shutdown (ASD) Relay", to activate fuel pump and pressurize system.
  6. Check for leaks.

Nov 07, 2008 | 1999 Dodge Caravan

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