Question about 2001 Harley Davidson FLHT Electra Glide Standard

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Fuel level gauge not working how to check voltage

Replace fuel gauge that was not problem

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Hi Anonymous, have you fuel gauge sending unit checked out and wiring for power to it should be 12 volts.Good luck

Posted on May 18, 2015

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Posted on Jan 02, 2017

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2006 Chevy Colorado Truck. Gas tank filled and fuel gauge indicator dropped to 1/4 full, when truck is idling fuel gauge drops to empty and low fuel light comes on. Suggestions? Thank you.


Check and or test fuel gauge sending unit and the gauge . Videos on youtube showing how to . Also i would have the vehicle checked for DTC's - diagnostic trouble codes . You may want to think about taking to a qualified repair shop .

Fuel Gage
The instrument panel cluster (IPC) displays the fuel level as determined by the engine control module (ECM). The IPC receives a serial data message from the BCM indicating the fuel level percent. The fuel gage defaults to empty if:
• The ECM detects a malfunction in the fuel level sensor circuit.
• The IPC detects a loss of serial data communications with the BCM.
• The BCM detects a loss of serial data communications with the ECM.

DTC P0461
The fuel level sender changes resistance based on fuel level. The powertrain control module (PCM) monitors the signal circuit of the fuel level sender in order to determine fuel level. When the fuel tank is full, the sender resistance is low and the PCM senses a low signal voltage. When the fuel tank is empty, the sender resistance is high and the PCM senses a high signal voltage. The PCM uses the signal circuit of the fuel level sender in order to calculate the total remaining fuel percent in the tank. The PCM sends the fuel level percent via the class 2 serial data circuit to the instrument cluster in order to control the fuel gage. The fuel level information is also used for misfire and evaporative emission (EVAP) diagnostics.

DTC P0462 Fuel Level Sensor Circuit Low Voltage
DTC P0463 Fuel Level Sensor Circuit High Voltage

Jan 01, 2017 | 2006 Chevrolet Colorado

1 Answer

Fuel gauge "freezed"


When checking fuel level you check resistance, the resistance changes with fuel level. You may have burned out your sensor.

Jun 07, 2013 | 2011 Yamaha TDM 900

1 Answer

I have a 1992 Mercury Grand Marquis Ls with a fuel gauge that does not work (gauge may be reversed)??? help please.


The fuel level indicating system is a magnetic type system, which consists of the sending unit located in the fuel tank, an anti-slosh module located on the back of the instrument cluster, and a fuel gauge located in the instrument cluster. The sending unit changes resistance according to the level of fuel in the fuel tank, which varies the current flow through the gauge.The pointer position varies proportionately to the current flow. In this system, the sending unit resistance is low (22 ohms) when the fuel level is low and high( 145 ohms) when the fuel level is high. The pointer of the magnetic gauge remains in position when the ignition is turned to the Off position. On some models, an anti-slosh module is used to dampen out fluctuating fuel signals from the sender. Some vehicles are equipped with a low fuel warning indicator. The anti-slosh module will also actuate the low fuel indicator when the fuel level in the tank reaches 1/16 to 1/8 full.


Do your other gauges/warning indicators work properly with the ignition on? If not, check for power at the fuse panel/fuses.

If they do then partially remove your cluster with connector still installed and check for voltage at cluster connector and gauge. Check continuity of cluster and gauge for ground.

Sometimes the anti-slosh module (if installed) goes bad in the Grand Marquis but not likely.

Sender troubleshooting:
  1. Perform test with resistors as follows:
    1. Disconnect wiring connector at sender unit, then connect resistor between gauge lead and a suitable ground.
    2. Turn ignition switch to On position.
    3. With 145 ohm resistor, the gauge pointer should contact the Full mark.
    4. With 22 ohm resistor, the gauge pointer should contact the Empty mark.
  1. Perform test with fuel sender of known quality as follows:
    1. Turn ignition to Off position.
    2. Disconnect wiring connector from sender and connect it to test sender.
    3. Move float rod away from fuel filter against Full stop position. Wait approximately 30 seconds, then turn ignition switch to On position. The gauge should read on or above the Full mark.
    4. Move float rod toward fuel filter against Empty stop position. Turn ignition switch to Off position. Wait approximately 30 seconds, then turn ignition switch to On position. The gauge should read on or below the Empty mark. If gauge works properly replace sender, which involves dropping fuel tank.

Mar 23, 2013 | 1992 Mercury Grand Marquis

1 Answer

Fuel gauge is pegged to empty on 09 street glide


Don't know if it's the same routine, but here's the troubleshooting for a 2009 Road King:

Disconnect harness from fuel gauge
Turn ignition switch to IGN. Check for voltage at terminal 1 of fuel gauge connector.

If no voltage, repair the break.

If voltage present, disconnect harness connector from speedometer.
Check for continuity between terminal 9 of speedometer connector and terminal 2 of fuel gauge connector.

If no continuity, repair the break

If there is continuity, check resistance to ground on yellow/white wire in speedometer connector.

If less then 10 Ohms, go to item #1
If more then 10 Ohms, go to item #2

item #1:
Disconnect the fuel pump/level sending connector from the sender.
Check for continuity between terminal "A" of the connector and ground.

If continuity is present, locate and repair short to ground.
If continuity is not present, replace the fuel level sender.


item #2:
Greater then 10 Ohms resistance:
Reconnect fuel gauge connector to the gauge.
Turn ignition switch to IGN.
Check for voltage on terminal "9" of the speedometer connector.

If voltage is present, replace the speedometer.
If voltage is not present, replace the fuel gauge.


Hope this helps!

Nov 26, 2012 | 2009 Harley Davidson FLHX Street Glide

1 Answer

Fuel gauge not working properly. Says fuel tank full when fuel tank empty


Could be 3 thing - the gauge on the dash, the wiring or the fuel level indicator in the tank. All three are not easily accessible - the best test would be to measure the voltage on the level sensor on the tank.

It usually means removing the fuel tank and start measuring. If its ok, supply voltage to the lead towards the fuel gauge. If the gauge doesn't move it's wiring or the fuel gauge itself.

Jun 26, 2011 | 1999 Cadillac DeVille

5 Answers

P0463 Fuel Level Sensor Circuit High Input Any ideas on the problem and possible solutions?


P0463 - Fuel Level Sensor Circuit High Input
An excessively high voltage is sent from the sensor is sent to ECM.

The fuel level sensor is mounted in the fuel level sensor unit. The sensor detects a fuel level in the fuel tank and transmits a signal to the ECM or PCM.

It consists of two parts, one is mechanical float and the other side is variable resistor. Fuel level sensor output voltage changes depending on the movement of the fuel mechanical float.


Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)

Possible causes
- Fuel level sersor circuit harness or connectors is open or shorted
- Fuel level sensor may be faulty

Possible solution
Replaced fuel level sensor.

Hope helps (remember to rate this answer).

May 07, 2011 | Ford Explorer Cars & Trucks

1 Answer

I need to locate the fuse for my gas gauge in my 99 malibu


There is no fuse specific to the fuel gauge. The Instrument panel has two fuses that supply power to everything it has on it. The fuel gauge signal is received from the body control module which sends out a signal voltage to the fuel level sending unit. Depending on where the float in the tank in determines how much resistance the sending unit has. the body control module interprets the voltage value into a fuel level and sends a signal to the gauge.

If the gauge is not working the most common cause is the sending unit in the tank.

Nov 11, 2010 | 1999 Chevrolet Malibu

1 Answer

Trying to locate electrical junction to test fuel level sensor


Fuel Level Indication System The fuel level indication system is a magnetic gauge system. It consists of a magnetic fuel gauge (9280) mounted in the instrument cluster (10849) and a sending unit located in the fuel tank (9002) with an instrument cluster gauge amplifier (10E849) in series between the two. No instrument voltage regulator is used with this system. Fuel Gauge
The magnetic gauge movement consists of three primary coils, one of which is wound at a 90-degree angle to the other two. The coils form a magnetic field which varies in direction according to the variable resistance of the sender unit which is connected between two of them. A primary magnet, to which a shaft and pointer are attached, rotates to align to this primary field, resulting in pointer position. The bobbin/coil assembly is pressed into a metal housing which has two holes for dial mounting. There is no adjustment, calibration or maintenance required for these gauges. The instrument cluster amplifier is calibrated to the fuel gauge. The instrument cluster amplifier and fuel gauge must be replaced as a system. Instrument Cluster Gauge Amplifier/Check Gauge Module
The instrument cluster gauge amplifier electrically averages fuel sender readings so the fuel gauge displays actual fuel level and not fluctuations due to sloshing in fuel tank. The instrument cluster gauge amplifier is a small printed circuit board which latches into a pocket on the back of the instrument cluster. The electrical connections for ignition, ground, input from fuel sender and output to fuel gauge are made through a spring-type connector on the instrument cluster gauge amplifier to the instrument cluster printed circuit (10K843) on the instrument cluster. There are no provisions for calibration or adjustment of the instrument cluster gauge amplifier.
Fuel Sending Unit
The fuel sending unit consists of a variable screened resistor made up of a ceramic substrate. It is controlled by the action of an attached float in the fuel tank. When the fuel level is low, resistance in the sending unit is low. When the fuel level is high, the resistance in the sending unit is high. As the float moves from empty to full, the resistance will gradually and continuously increase. f9e3b50.gif

Mar 10, 2010 | 1997 Ford Ranger SuperCab

1 Answer

1989 Saab 900 low level fuel light


You don;t say whether the fuel gauge is reading accurately, or whether it's always on empty. If the gauge is always showing empty, it's most likely a problem with the sending unit in the fuel tank. Check the resistance across the two terminals of the sending unit.

On a C900, the fuel sender level unit is separate from the fuel pump and located on the right side top of the tank, accessible by removing the trunk floor lift up panel (the pump is located on the left side top of the tank.
Possible problems are: electrical line off or broken, float not working (it's fairly delicate); or gauge not working.

Test the resistance of the sending unit with the lines disconnected, the resistance should be 2.6 to 3.8 ohms full tank, 63.3 to 67.5 ohms empty tank; and test for voltage across the top of the sender unit, if no voltage, that's likely the problem!

If the gauge is otherwise reading accurately (showing 'full' for a full tank, etc) then the problem is likely a gauge malfunction and can be simply replaced.

Good luck!

Saabreur

Jul 10, 2008 | 1989 Saab 900 4 Door

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