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Fuel gauge reads full all the time - 1999 Chevrolet K1500

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Check ground wire

Posted on Apr 10, 2011

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Posted on Jan 02, 2017

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Took my car in because of a gas leak and gasgauge that reads FULL all the time.. mechanic replaced the fuel pump but can't get the gas gauge to not read FULL. What to do?


If he told you the fuel pump would correct the fuel guage, take the car back and make them fix it under warranty. I have been in the auto repair business for 21 years and if I mis-diagnose a car, I have to fix it for free to keep the customer happy.

Oct 04, 2012 | 2002 Saturn L-Series

1 Answer

Fuel gauge reads past full all the time


when the tank is full the resistance is low so the power through the gage make is read full
as the tank empties , the resistance increases so the less current means the gauge reads less until empty there is little or no power , the gauge reads empty
simple check , turn the ignition off, no power , no gauge reading

Sep 09, 2017 | Chevrolet S 10 Cars & Trucks

1 Answer

Fuel gauge reads past full all the time


float may be stuck up;Take tank unit out and check it with power on and observe the travel and relative gauge position.

Sep 09, 2017 | Chevrolet S 10 Cars & Trucks

1 Answer

Why does the fuel gague in my 1988 Honda accord always read full?


check to see if your fuel gauge is working by disconnecting the fuse from the panel, if gauge reads e then ground the fuel gauge if it reads full then the fuel gauge reads fine the its the float sensor in the fuel tank. good luck have fun

Oct 21, 2011 | 1988 Honda Accord 4 Door

1 Answer

Fuel gauge reads full all the time,and we did install a new sending unit with new fuel pump


Dont we wish it be full all the time but gas in it. Okay for the sending unit reading full its getting a full ground reading,Key on engine off. does it move and goe down. It should if it doesnt the problems with the gauge itself. 2 test disconnect the wire harness, did the gauge go down. the problem will be in the sending unit can be a hung float(Rare).

Apr 26, 2011 | 1994 Dodge Caravan

1 Answer

Gas gauge reads full when underway. However, when


Most likely it a bad fuel level sensor on you fuel pump. You will have to replace the fuel pump as that is the only way to replace the sensor for you fuel gauge. The sensor is built into the fuel pump. The contacts on the sensor become corroded over time and cause the sensor to malfunction causing your fuel gauge to read full all the time. I have a 2001 Montana extended version that had the same problem. In order to know when I needed to fill the tank, I would completely fill it each time I put fuel in and reset my trip odometer. I would go 400 miles on the tank before I would refuel until we were able to replace the fuel pump.

Oct 30, 2009 | 2000 Pontiac Montana

2 Answers

Fuel gauge not working all the time.


This is a normal concern.
The instrument cluster uses 4 different operating modes to calculate the fuel level:
Anti-slosh (default mode)
Key OFF fueling
Key ON fueling
Recovery
After a fuel fill up, the time for the fuel gauge to move from empty (E) to full (F) ranges from 2 seconds to 55 minutes depending on which operating mode the fuel gauge is in.
The default fuel gauge mode is called the anti-slosh mode. To prevent fuel gauge changes from fuel slosh (gauge instability due to changes in fuel sender readings caused by fuel moving around in the tank), the fuel gauge takes approximately 55 minutes to go from empty (E) to full (F).
The key OFF fueling mode (2 seconds to read empty [E] to full [F]) requires 3 conditions be met:
The key must be in the OFF position throughout the entire refueling of the vehicle.
At least 15% of the vehicle's fuel capacity must be added to the fuel tank.
The instrument cluster must receive a valid key ON fuel sender reading within 1 second of the key being put into the RUN position. The key ON sample readings are considered valid if the fuel sender reading is between 15 ohms ± 2 ohms and 160 ohms ± 4 ohms.
If these conditions are not met, the fuel gauge stays in the anti-slosh mode, which results in a slow to read full (F) event.
The key ON fueling mode (approximately 90 seconds to read empty [E] to full [F]) requires 3 conditions be met:
The transmission is in PARK (P).
The key is in the RUN position.
At least 15% of the vehicle's fuel capacity must be added to the fuel tank.
In key ON fueling mode, a 30-second timer activates after the transmission is put into the PARK (P) position (automatic transmissions). When the 30-second time has elapsed and at least 15% of the vehicle's fuel capacity has been added, the fuel gauge response time is 90 seconds to read from empty (E) to full (F). When the transmission is shifted out of PARK (P), the fuel gauge strategy reverts to the anti-slosh mode. The key on refueling mode prevents slow to read full events from happening if the customer refuels the vehicle with the key in the RUN position.
Recovery mode is incorporated into the instrument cluster strategy to recover from a missing fuel level input during a refueling event. Missing fuel level inputs result from intermittent opens in the fuel sender or its circuits. Recovery mode (empty [E] to full [F] approximately 20 minutes) is initiated when the following 2 conditions are met:
The instrument cluster is in the anti-slosh (default) mode.
The actual fuel level in the tank is greater than what is being displayed by the fuel gauge

Feb 18, 2009 | 1983 Mercury Grand Marquis

1 Answer

Fuel gauge reads full all the time


your ground wire from your fuel tank to the chassis has come disconnected

Jan 16, 2009 | 1991 Nissan Pathfinder

1 Answer

2003 Ranger Edge Fuel gauge


CHECK ENGINE LIGHT ON READS FUEL SENSOR
AND 5 CYLINDER

Dec 31, 2008 | 2003 Ford Ranger Regular Cab

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