Question about 1985 Ford Thunderbird

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1985 t-bird, fuel gauge constantly reads full

Im pretty sure its either the sending unit or the gauge itself, my problem there in lies, id prefer to locate an o.e.m part for both, the sending unit as well as the gauge.

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I really doubt it is the fuel gage. You can test the gage by hooking a C cell battery to the wires from the tank. If it pegs the gage is good. You will need to go to Ford to get the sending unit. I doubt they will have this in stock, but they will order it for you. I would not even consider an aftermarket sending unit. Stick to the original Ford part. You will be happier with the results.

Posted on Feb 18, 2009

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I have a problems with my gage on my 1997 ford Thunderbird the gas go to full all the time what could that be


Here are some suggestions:

TROUBLESHOOTING
PROBLEM: The fuel gauge does not work at all...no needle movement. With the ignition switch on, remove the wire from the fuel tank sending unit and ground it to the unit housing. This removes the resistance supplied by the sending unit, and should cause the gauge to swing over to the 'Full' position. Does this happen?
Yes
No
The gauge and wiring are good. The problem is most likely with the sending unit. The sending unit must be removed for further testing. (1) Ground the sending unit wiring to a good chassis ground (instead of the sending unit housing) and watch the gauge. Does it now peg out to the 'Full' side? Yes
No
The problem is with the sending unit ground. Either the unit itself is bad or the float/arm is binding/missing. The sending unit must be removed for further testing. The power supply to the gauge has been interrupted, (check fuses), the gauge is defective, or the wire from the gauge to the sending unit is open or has a break in it. Testing the Sending Unit After the sending unit has been removed from the tank, check to make sure the float is present, intact and still floats and that there is no binding with the float arm. Reconnect the gauge wiring to the unit and ground the unit. Move the float arm up and down. If the gauge reads full in the full up position and empty in the full down position, then the sending unit is good. Verify by hooking up an ohmmeter to it and making sure it reads 8-12 ohms full and 70-73 ohms empty. If not, the sending unit needs repaired or replaced. You can easily disassemble the head of the sending unit to clean and/or repair.

Apr 28, 2016 | Ford Cars & Trucks

1 Answer

Gas gauge constantly reads full


you have a float arm in the tank that rises when you add fuel I think its called the sending unit in the tank with fuel pump. it could be getting defective or it could be you fuel hand gauge going defective.but biggest part of time its the sending unit in the tank, hope this helps

Mar 30, 2014 | 2001 Acura 3.2CL

3 Answers

All other gauges work on the hyundai but the fuel gauge wont work shows empty all the time how can i fix this problem


Turn the ignition on and off several times before inspecting the gas tank because a blown fuse is the usual cause for fuel gauge malfunctioning. If the gauge remains motionless, check your fuse box and determine the fuse's location using your service manual.
Replace the fuse if the link is broken or damaged. Then, inspect the gauge's wire connections for cleanliness and make sure the wires are connected.
Turn the ignition switch to the "off" position. Attach one end of a jumper cable to the fuel-gauge terminal behind the gauge itself. Attach the other end to the ignition terminal.
Replace the sender unit in the gas tank if the gauge reads full and your car does not have a full tank. Replace the fuel gauge if the needle remains inoperative.


Jun 12, 2011 | 1994 Hyundai Sonata

1 Answer

Fuel gauge reads full all the time,and we did install a new sending unit with new fuel pump


Dont we wish it be full all the time but gas in it. Okay for the sending unit reading full its getting a full ground reading,Key on engine off. does it move and goe down. It should if it doesnt the problems with the gauge itself. 2 test disconnect the wire harness, did the gauge go down. the problem will be in the sending unit can be a hung float(Rare).

Apr 26, 2011 | 1994 Dodge Caravan

1 Answer

1991 pontiac fire bird fuel gauge sudenly over full had 1/4 tank yesterday?


the fuel sending unit that is in the fuel pump went bad, therefore giving you false readings, the only way to fix it is replace the fuel pump.

Nov 30, 2010 | 1991 Pontiac Firebird

1 Answer

Fuel gauge not give proper reading.. register full


Sorry to say,but the fuel sending unit is the problem,the fuel tank will have to be lowered out of the vehicle to replace the unit.If the fuel sending unit is not available by itself you will have to replace the whole fuel pump assembley.

Oct 14, 2009 | 1999 Buick Regal

2 Answers

1985 Dodge Ramcharger fuel gauge not working


The problem most likely is not the gauge itself. It could be faulty wiring between the gauge & sending unit, or most likely a bad sending unit in the tank. Visit Ramchargercentral.com, do a thread search on fuel gauge issues, and you'll find a ton of info. If you need anything clarified, post up on the vehicle help board...the members there are happy to help!

Jun 07, 2009 | 1985 Dodge Ramcharger

1 Answer

Cherokee sport 2000 gas gauge reads empty even when tank is full


My guess is it's the fuel sending unit which is in the fuel tank itself. A lot of vehicles sending unit is part of the fuel pump, if you're a pretty good mechanic, you can run the tank down really low, lower the fuel tank and replace the sending unit.

Apr 07, 2009 | 1999 Jeep Cherokee

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!

Saabreur

Jul 10, 2008 | 1989 Saab 900 4 Door

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