Question about 1987 Toyota Pickup

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Fuel gauge reads 1/4 but tank is full. - 1987 Toyota Pickup

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  • customtileus Aug 28, 2008

    I just purchased 1987 toyota pickup and the gas gage works when i fill it up , but when it gets to about 1/2 tank it does not work. some times it goes up and then down? any suggestions would be of help. Thanks, Ray C

  • yoda man Mar 02, 2009

    replacing is easyer said than done it seams to be the hardest part to find good luck
    signed still looking 4 months later lol

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1 Answer

Fuel sending unit is dirty or broken, get it replaced

Posted on Aug 15, 2008

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The gas gauge on my 2001 Nissan Altima shows full when filled up, but only tets to 1/2 full when it is near empty. Suggestions?


Either the fuel tank sender in the tank is bad and needs replacement, or the fuel gauge is faulty. I would bet the one in the tank is probably bad, because that's usually the case. Find the connection at the fuel tank, disconnect it and use a VOM to get a resistance reading while the tank is empty and reading 1/2. It should match the specs.

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The fuel gauge on my 01 caravan 2.4l reads full when running, and only reads 1/4 when off, any ideas what it could be?


Many cars do this to discourage gas theft. If the car fuel gauge only shows 1/4 full, a potential thief may not bother to steal 2 or 3 gallons of gas. This is very normal.

If the gauge is stuck on full and you are sure the tank isn't full, you have a sensor sending wrong information to the dash gauge. Most cars now have a single fuel pump and sending unit that can be replaced by a mechanic.

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I have Nissan patrol super safari mod.2005, problem with fuel gauge main tank showing maximum spare tank minimum please help


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I drive mercedes-benz 180 C-class, my fuel gauge reads 1/2 tank while my car refuse to start, i added fuel up to full tank and the car started. the following day my car stopped while the fuel gauge was...


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See the dealer.
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1 Answer

CAR switches itself off when fuel is on querter tank


check the calibration of the sender unit as may actually be on empty. Find out the exact capacity of the tank and add a known amount of fuel and see where the gauge reads. For example if the tank is 60 ltrs or 20 gallons add 5 gallons and see where the gauge reads. 5 gallons in 20 gallons should read 1/4 or in your case after the engine stops should read 1/4 full. If it reads 1/2 then the sender is out.

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1 Answer

Gauge reads full when tank is empty


You have a bad ground, you will have to remove the fuel tank and check the connectons on top of the tank, probably corroded. You can clean the terminals or change them.

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2007 Subaru WRX Fuel gauge does not work porperly. When the tank is topped off, the fuel gauge reads full, but after much driving the gauge only drops to 3/4 a tank and slowly to half of a tank on the...


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Fuel gauge on 1993 Dodge Dakota V8


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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

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