Question about 1985 Toyota 4Runner

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Fuel gauge not working stays on emtpty all the time . were is the best place to start looking for fault?

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Connections under the car leading to the fuel sender unit.
test gauge with multimeter for continiuity
take tank off and inspect fuel sender unit for signs of physical damage around the copper coil and test with multimeter for resistance by moving float up and down and resistance should increase one way and decrease the other way

Posted on Sep 10, 2010

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Posted on Jan 02, 2017

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I HAVE A 1999 PONTIAC GRAM AM WHEN I START THE THE CAR THE FUEL HAQND GOES TO FULL THEN DROPS TO EMPTY AN STAYS THERE AN I NO FUEL IS IN IT


It has to be the sender unit in the tank, or the gauge in the dash, or the wiring between them. In most cases, it is the sending unit-they are quite fragile often. Usually best to replace them (not very expensive-just difficult to get to.) The sending unit will be located with the fuel pump inside the tank. They are removed as one single unit.
There is a way to test if the dash gauge itself is working properly. You have to find the wire going into the fuel tank that is from the gauge, then with key on, ground that wire to the frame-you can use a jumper wire into the fuel tank electrical connector. When the wire is grounded, the gauge will definitely move to one place (either half full, or full-but it moves and stays there). If you see that, you know the sending unit in the gas tank is bad. Do not ground that wire for more than a couple of seconds, it is lo0w voltage, but it may cause a shorting problem.

Oct 07, 2016 | 1999 Pontiac Grand Am GT

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Just got saab 900s 2.0 petrol non turbo on a 98 plate ,is the old motor with dizzy cap ,fuel gauge stuck on full and no temp gauge ,whers best place to start look


The fuel gage is most likely the fuel level sending unit inside the fuel tank, the temp could be wiring or the temp sending unit on the engine, try that first.

Sep 21, 2016 | 1998 Saab 900 S

1 Answer

2003 Mercury Optimax 225 hp. BEEPING than constant buzz behind gauges after starting and running from winter layup. Put all fuel additive and topped oil injection reservoir.


sounds like a relay or other electrical device is noisy , only way to find out is to strip out instrument panel and try to locate the 'noisey' item, a good place to start is the fuel gauge as they have a resistor build in and they can cause a buzzing when the are getting worn out , fault finding at it's best , good luck and take your time and be patient and keep me posted if you wish

Jun 08, 2014 | Cars & Trucks

1 Answer

Thanks for the advertisments but they didnt help me troubleshoot my problem with my dashboard warning lights staying on when all my levels are good. All guages such as speedometer and fuel gauge works but...


Im i right and this is a convertable? If you or someone else has left the car in the rain, top down, It's very possible that there Is corrosin Somewere in the dash! pull the speedo and inspect the board For any damage! Look hard around areas thet are lit up. Maybe your best place to look hope thes helps! Good luck and let me know!













May 13, 2014 | 1998 Chevrolet Cavalier

1 Answer

Fuel gauge stays on full


You may have a unique problem!!! Normally I would say it is the sending unit- in the fuel tank!!!! But Buick LeSabre had a weird thing happen from time to time. Look closely at your fuel guage and focus on the PIN that acts as a stop for the fuel guage to not go beyond the Full mark. Make sure the pin is on the correct side of the pin!!! Sometimes the needle will somehow jump the pin on "E" or "F", and literally hold the needle in place.

Mar 28, 2014 | 2002 Buick LeSabre

1 Answer

Fuel gauge Stuck


The most common way to find out is to test both components.
The sending unit in most vehicles grounds the gauge on the dash.
You would unplug the sending unit - pump harness at the tank and ground the sending unit wire. If the gauge climbs up to full the sending unit is at fault.
You could also measure resistance in the circuit in the tank when the tank is close to empty and after filling it up. The resistance should be different each time.

Mar 11, 2013 | Cars & Trucks

1 Answer

Changed fuel pump,now the gas gauge stays on half mark and oil pressure stays on also , temp gauge stays up to ,when key is off what would cause this


Well fuel gauge stuck temp oil pressure gage all gages i say you have one of the wires pinched above the gas tank!!!!good place to start

Jan 30, 2011 | 1996 Chevrolet Blazer

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The fuel tank gauge is not working correctly , the gauge will move from full to quarter quickly and then stay there for along time ?


It would appear your sending unit is failing, this is located within the gas tank. On this car I believe you can access the fuel tank by the trunk. Remove the liner and look for a hatch cover (usually held in place by 4-6 screws) once this is removed you should be looking at the top of the gas tank.
I hope this may have helped,
Tom

Oct 10, 2009 | 2006 Mitsubishi Lancer Evolution

1 Answer

Fuel gauge doesnt work


The fuel gauge in the fuel tank is simply a float connected to a bar connected to the sensor. Take a look at that and see if that float is stuck in one place causing a false reading.

Jan 11, 2009 | 1989 Chevrolet K1500

1 Answer

1996 jeep Cherokee sport all instrument gauge cluster kicks on and off.when it stops working the fuel gauge goes to full with the low fuel light on,rpm,speedometer and mileage stop working.some times I'll...


if the a/c line exploded and it the juction box and it arced chances are you got a voltage spike to the ecm and fried it that would explain the the rough running and the cluster going nuts. you can get a replacement ecm at a salvage place for around 200 bucks maybe less. for get the dealership your going to pay alot more. if you check the ecm i'm sure you will find the main plug probably burnt too. please rate this thanks and good luck.

Sep 02, 2008 | 1998 Jeep Grand Cherokee

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