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Fuel gauge on my Mitsubitshi Pajero mk2 has started reading full is this a short or an open circuit and any ideas where to start looking. I did try disconecting multi plug on sensor but gauge still reads full.

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The answer for this is simple the fuel guage sending unit is defective, it is in the fuel tank, nothing else will cause this type of symtom.

Posted on Oct 16, 2008

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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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Check for a frayed wire touching metal and grounding out. The gauge works on resistance and it registering full indicates a short to ground. Either that or your gauge itself is bad.

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At the start of the engine, the fuel gauge reads empty. i know for sure the gas tank is filled up with a decent amount or its full. after afew miles, the gauge slowly moves to its proper reading. i know...


Most cars and truck nowdays show the tank empty when you start it. Then it slowly advances to the correct level of fuel in the tank. You can try and use some fuel additives like Gumout or Valvoline that clean the injectors and other fuel sytem parts. You can get a buildup of tarnish in these parts and this can cause slow readings. If this was the case it should improve after a few tank fulls of gas with the cleaners added. The guage could also slowly be going bad. The newer style guages are connected to the fuel pump and you will need to replace the whole unit if this goes out on you. Keep in mid that when the fuel pump quits, it quits, usually without much advance notice. If the car starts sputtering and does not have full power, this will hint at the fuel pump going bad. If your car has over 100,000 miles on it, you might want to think about preparing to change the fuel pump, these seem to want to go out shortly after 100,000 miles, but you can get lucky once in a while and it can last longer. Keeping your tank at least half full with clean gas is a big help, the gas keeps the fuel pump cool so it last longer!

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Getting computer code p1665 fuel level output circuit. Fuel gauge appears to be shorting out because it is always reading full


CODE P1665 - EVAP VENT SOLENOID CONTROL CIRCUIT MALFUNCTION CONDITIONS.POSSIBLE CAUSES / VENT SOLENOID CONTROL CIRCUIT OPEN SHORTED TO GROUND OR TO SYSTEM POWER / VENT SOLENOID POWER CIRCUIT IS OPEN CHECK THE ENG CNTL FUSE / EVAP VENT SOLENOID IS DAMAGED OR HAS FAILED / PCM HAS FAILED.

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Fuel gauge will not read when tank is full


sounds like a bad sending unit(verify by shorting the wires to the gauge(will read full)then opening the circuit(will read empty)

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1999 gmc jimmy fuel gauge reads empty, pulled fuel tank test sending unit and it ohms out ok??Any wiring issues to look for


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My 2000 Chevy Impala fuel gauge reads empty.


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98 ford ranger fuel gauge not working


The float on the sending unit could be jammed of your have a short in the harness.

Check the harness first and pay attention to the connections, if there ok then it's the float on the sending unit on the gas tank.

Sorry for the bad news but it make start to work again any time if it is the float.

Good luck, and hope this helps

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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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