Question about 1992 Toyota Land Cruiser

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Sub Fuel Tank

I want to know what the resistance for the sub fuel tank sender unit please.

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  • Anonymous Oct 06, 2008

    I have a problem with my main fuel tank sender on a 96 landcruiser.

    Do I have to drop the tank to test the sender or is there an easier way?

    Sometimes over rough tracks the gauge will work, but mostly the gauge sits on half full.

    Could this be a sticking float, bad earth or broken sender?

    Any suggestions?



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Very Hard!!!! There are no specs on this, the only way out is to go to your nearest dealer and look at a sender unit and measure its resistance and compare the 2 sender units resistance. It should be measured in Kilo holms, the way to measure it is read the resistance when the floats at its 'lowest' point, and the resistance sould either increase or decrease when you move the float 'up', this depends on what resistance the fuelguage requires, to test if the fuel guage works,'take the positive cable that plugs into the sender unit, fuse it with a low ampeage fuse and connect it to body/chassis while key 'on' and check fuel guage, it must go to full position, there could be another problem, check cables for opencircuits, and check earth(-)connection to the sender unit, plse post to me for further assistance Mishdaman.....

Posted on May 25, 2008


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Posted on Jan 02, 2017


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So i have a 86 isuzu trooper four cylinder and i have a problam with the fuel gauge not reading what can be my probalms and how do i fix it

it could be a loose wire at the unit or possibly a bad ground or both . it could also be as simple as a fuse

Jan 24, 2015 | 1986 Isuzu Trooper

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How do you replace the plunger attached to the fuel gauge

my guess is the fuel sender is bad. in the tank.
did you check the resistance first?
low ohms say 25 full or over 100 empty
and NEVER infinity:?
yes/ no?
if it measures wrong , at the harness,
then its bad. or its conn, rusty.

so you must drop the tank on most cars to do this.

all this is covered in the FSM.
or all covered at, log in read. (fuel system chapter)
ill answer for USA car, no engine options stated, (that too can change answers)
SUB 1500 , not 2500 answer. not stated that either.
4.3L ( of the 5 engines,)
ill quote the FSM (alldata page)
remove tank (sure drain it first.) the sender on this car is with pump assy.
1 Remove the fuel tank. Refer to Fuel Tank Replacement .
Remove the fuel sender assembly retaining ring using the J 44402 (Image 1) .

2 Remove the fuel sender assembly and the seal. Discard the seal.

Important: The fuel strainer must be in a horizontal position when the fuel sender is installed in the tank. When installing the fuel sender assembly, assure that the fuel strainer does not block full travel of the float arm.

see special tool to remove the assembly , clamp ring from tank.

buy the FSM
or login to and read the instructions, warnings and all steps.
its non trivial.

but dont do it of the resistances read good.
first do the tests for the sender
and only replace it , if really bad.
why do all that work for 1min test..???/? <<< seen 10,000 times this forum. all guessing, sad to see.

May 20, 2014 | 2002 Chevrolet Suburban

1 Answer

Fairlane faulty fuel gauge

ford have a gauge sender in the tank that operates by a resistance through the fuel. less fuel more resistance lower reading. I would check for voltage at the tank unit and it is more than likely the fault will be found in the sender unit

Jan 19, 2013 | Ford Cars & Trucks

2 Answers

1998 landcruiser won't run on main tank but will run on sub tank

It could be either the switch is broken, pop it out and look for shorts or anything. The other thing that comes to mind is checking the fuel filter and fuel pump or the solenoid that switch between the tanks.

Mar 08, 2011 | 1998 Toyota Land Cruiser

1 Answer

Fuel gauge stays at 3/4, after fill up

fuel gauges work using a variable resistor. Typically, when the fuel level is low, the fuel level sender is working at a high resistance. When the tank is full, the sender is working with a low resistance. Anything that increases the resistance in the circuitry will lead to a false low reading. Dirty or corroded wire terminals in the fuel sender circuit would raise the resistance. If you can remove the fuel sender unit from the tank, you can use an ohm meter to check its resistance. When the float is low, you should see a resistance of around 100 ohms. When the float is up (tank full) you should see a low resistance of about 2-5 ohms.

Jan 29, 2011 | Subaru Outback Cars & Trucks

2 Answers

After filling my fuel tank, gauge does not go to takes a few days or hours for gauge to read full

There is a TSB on high sulfur fuel usage, and how it impacts the fuel level resistance.
If you change fuel, it might start working again. The TSB is : ERRATIC FUEL GAUGE OPERATION TSB 08-2-9

Publication Date: January 22, 2008
FORD: 2004-2008 F-150
LINCOLN: 2006-2008 Mark LT

Some 2004-2008 F-150 and 2006-2008 Mark LT vehicles, built before 12/3/2007, may exhibit erratic fuel gauge operation or illuminated malfunction indicator lamp (MIL) with diagnostic trouble codes (DTCs) P0460 or P0463, and/or Instrument Cluster Module DTC B1201. This may be caused by sulfur contamination in the fuel causing an open or high resistance in the fuel level sender.

Follow the Service Procedure steps to correct the condition.


Install a new fuel level sender following the service procedure instruction sheet provided in the fuel sender kit.

8L3Z-9A213-E Kit - Fuel Sender (2006 starting 12/8/2005 through 2008 - FFV-26 Gal Tank - 126/132" WB )
8L3Z-9A213-F Kit - Fuel Sender (2006 starting 12/8/2005 through 2008 - FFV-30 Gal Tank - 139" WB)
8L3Z-9A213-G Kit - Fuel Sender (2006 starting 12/8/2005 through 2008 - FFV-27 Gal Tank - 145/151/163" WB
8L3Z-9A213-H Kit - Fuel Sender (2006 starting 12/8/2005 through 2008 - FFV-36 Gal Tank - 145/151/163" WB
8L3Z-9A213-A Kit - Fuel Sender (2004 through 2008 - Gas-26 Gal Tank - 126/132" WB
8L3Z-9A213-B Kit - Fuel Sender (2004 through 2008 - Gas-30 Gal Tank - 139" WB
8L3Z-9A213-C Kit - Fuel Sender (2004 through 2008 - Gas-27 Gal Tank - 145/151/163" WB
8L3Z-9A213-D Kit - Fuel Sender (2004 through 2008 - Gas-36 Gal Tank - 145/151/163"WB

Eligible Under Provisions Of New Vehicle Limited Warranty Coverage And Emissions Warranty Coverage
IMPORTANT: Warranty coverage limits/policies are not altered by a TSB. Warranty coverage limits are determined by the identified causal part.

080209A 2004-2008 F-150, 2006-2008 Mark LT: Install New Fuel Level Sender, Includes Time To Remove And Install Fuel Tank (Do Not Use With 9002A, 9002A4, 9002A6) 1.9 Hrs.

9A299 42

Apr 20, 2010 | 2006 Ford F-150

1 Answer

Sitting on empty when full 2005 main tank

Hi this is a common problem the problem is going to be with the fuel sender unit located in the top of the main tank.

The problem is you might have to remove the tank to replace the broken part that is unless their is a panel in the boot that can be opened that allows you access to the top of the tank if not then you need to make sure you have used all the fuel in the main tank to ensure its empty as it would be really heavy if it had fuel left in it.

With tank empty its best if vehicle is on ramps as you need alot of clearance to get the tank out so just having it on jacks and axle stands wont give you enough room to get to the top of the tank.

You need to disconnect all the fuel lines ie the out line and the return line you also need to disconect the fuel filler hose from the fuel filler cap area. Once this is done you can then undo the tank brackets holding the tanks its best if you have something to support the tanks whilst doing this as its not a one person job once its all undone and you can start lowereing the tank check their are no air pipes being stretched if their is remove them but remember they need to go back on then once the tank is lowered far enough you will then see where the fuel sendor wires run to these will then need disconecting this should then allow you to remove the tank.

Once tank is removed the fuel sender unit is on the very top of the tank it can be undone it might be that the float is stuck or even full of fuel causing the empty reading.

You can test the fuel sender by just connecting the fuel sender unit back up to the electrics then switch ignition on then work the float up and down and see if the gauge alters on the dash if it does then the chances are it might work if you put it back in but if it dont its a wasted job.

Its best if you replace it as you might get the same problem in the near future.

If their is a panel in the boot then this makes the job easier.

Let me know how you get on or if you need further assistance ok

Sep 15, 2009 | 1997 Toyota Land Cruiser

1 Answer

When fuel is low and in ramp way the car turned off

Fuel sender is likely coated from our wonderful fuel and there is actually less fuel in your tank then you think. The fuel sender works off resistance and is less accurate at low levels when the extra resistance from 'dirty fuel' skews your sensor. GM has a really good fuel cleaner that you can dump into your tank. Just ask a dealer, they will know exactly what you need

Jun 15, 2009 | 1999 Chevrolet Blazer

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!


Jul 10, 2008 | 1989 Saab 900 4 Door

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