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Anonymous Posted on May 10, 2010

Hi, I have a 99 4runner 3.4L. it is all about the fuel gate shown that is full tank all the time even my fuel is low. Now i replaced a sender located in the fuel tank. ( seem like it doesn't work). so, i replaced a new curcuit plate No. 3. ( the fuel gate reader). it seem like it is working to me but since the gas was very low, i have put $20 into it, than the gate doesn't move up at all. I used a 12 volts put thru the wires from the sender unit just to see if the gate reader will move up and yes it is moving up to hafe of the tank!!! now i let go the 12volts out the gate reader fall down to emty and i test it again 3 times, but my original millege it is disappear and the fuel gate reader is still emty. what should i do? please help

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  • Anonymous May 10, 2010

    Hi, I have a 99 4runner 3.4L. it is all about the fuel gate shown that is full tank all the time even my fuel is low. Now i replaced a sender located in the fuel tank. ( seem like it doesn't work). so, i replaced a new curcuit plate No. 3. ( the fuel gate reader). it seem like it is working to me but since the gas was very low, i have put $20 into it, than the gate doesn't move up at all. I used a 12 volts put thru the wires from the sender unit just to see if the gate reader will move up and yes it is moving up to hafe of the tank!!! now i let go the 12volts out the gate reader fall down to emty and i test it again 3 times, but my original millege it is disappear and the fuel gate reader is still emty. what should i do? please help

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  • Anonymous May 10, 2010

    i already check it at first time but no fuse was broken. they all ok. that is why it make me more worry about. this fuel sender has 3 line one of them is ground and other two is power. i been check all that already. now my main point is about the millege is disappear how can i restore them?.

  • Anonymous May 10, 2010

    ok.. i didn't check it yet but i'll do that, just wondering i have power prob 3 tools that i used and check it i point the top tip into one of each line to check what is ground and power so i got the power line and the other line wasn't do anything so i input 12 volts in that line i saw a level gate on datsh is moing up to the right position and the display was showing zero. any moment? please...

  • Anonymous May 15, 2010

    actually i already fix the problem just that i want to know if you guys know something but let me tell you what is the problem. the problem is the all about a circuit is bad. the circuit is at behide the millege dash. thank you anyway.

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Anonymous

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  • Posted on May 10, 2010
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I thought at first I could help because a fuel gauge showing full all the time is usually caused by a short or the fuel gauge wire grounded. However after all of the efforts it sounds like anything from a sticking float in the tank to wiring problems. You will need to use a meter and trace wires from the tank up then inside to the tank as far as you can go internally. Did you have the furl pump out when you changed the sender? Did you do anything with the float?

  • Anonymous May 13, 2010

    Hi, all wire is good just that the fuel gauge don't read right. i replaced the brand new gauge from dash and from tank (the sender) and wire check now. what happen? i don't know :( anyway the whole dash don't work now. millege, rpm, gas gauge. heat, all that was down. lol .. the fuse was good too.

  • Anonymous May 13, 2010

    Is that instrument cluster digital? If it is you may need to have it rebuilt. Or, if you don't care about keeping the mileage accurate you can get a used one at a salvage yard.

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  • Posted on May 10, 2010
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Hi! Fuel sensors have fuse. Have you tried checking on the fusebox for fuel gauge fuse? It may be faulty or blown thats why its not reading right. Try to check it and replace if necessary. HOpe this helps and have a good one!

  • dj_relly999
    dj_relly999 May 10, 2010

    Can you try to detach the instrumental panel and check if the connectors on the display is burned? The connectors may be fried thats why you dont have any display. Once you checked and found out that they are fried I would suggest that you get a replacement on the junkyard. It will be much cheaper than buying a new one.

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  • Posted on May 10, 2010
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I would say that you might have gotten a defective sending unit, or the float might have got damaged when it was put in. I would also check the wires from the sending unit to the fuel gate reader.

  • Anonymous May 10, 2010

    Are you getting power to the sending unit? Also a good ground, or earth connection.

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Related Questions:

0helpful
1answer

Why is my fuel gauge stuck on full even though there is only 50% of petrol in the petrol tank

Hi,it must be that the gauge or sender unit are faulty,check sender unit first.
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Gas guage reads full all the time

More than likely the fuel tank level sensor (which is located inside of the fuel tank is seized. You will have to have the fuel pump and level sensor replaced.
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Suzuki virara v6 ex sender earth wire

we, usa only have Grand vitara's in 05.???
our car if you scan it will show intermittant sender DTC errors.
P0464

the fsm BOOK cover these tests.
you unplug the connector, shown.
you attach and DMM , set to ohms.
about 2 to 150 ohms is range. low is full, 150 empty.
on mine, 32 ohms is 1/2 full. but as always, RTM
read the manual. the FSM.
or at alldata.com

the book shows what resistance for the sender equals 1/2 full
easy huh, a $10 meter and bam, the answer , no guessing
and draining a tank of fuel and wasted 5hrs labor +

pull the connector to sender
turn on key , guage must go to empty.
if not the wiring or gauge (rare) are bad.
if yes, the sender is hosed. (or jammed)


https://suzukipitstopplus.com/Products/1145-2004-vitara-service-manual.aspx
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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 alldata.com, 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 alldata.com 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.
0helpful
1answer

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.
12helpful
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2000 Buick Century gas gauge reads full all the time

You're either looking at a short in the wire that goes to the fuel sender, or a bad fuel sender. If it was just a broken wire, it would read empty instead. The fuel sender is a permanent part of the fuel pump, so that has to be replaced as a unit.
2helpful
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Fuel gauge reads E when first started, jumps to F after awhile

It is more likely to be the fuel guage sender which is faulty.
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Low fuel light stays on

change the sender unit in the tank,check wiring on top of sender unit
0helpful
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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
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