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Fuel tank reads full, sender i think is bad, estimated cost to replace on 2002 gran prix 3800

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I have a 2002 lincoln ls that has gas guage reading only a quarter tank when full. I know there is 2 pumps on this car, one is the primary pump under passenger back seat and a jet transfer pump on drivers...

Fuel pumps outside the gas tank have nothing to do with fuel gauge readings. There is a fuel level sender unit inside the tank with a float which supplys variable ground circuit to the gauge. If you can find the wire to this unit, you can ground it to see if the gauge now goes to full. If so, sender unit in tank is bad, or has bad wiring/ground.

Jan 30, 2015 | 2002 Lincoln LS

1 Answer

Gas guage does not work problem in tank

One problem is the non-working fuel guage sender, the other is ...? Well, it doesn't really matter because the tank pump (even if working fine) and fuel level sender are an integrated unit and must be removed and replaced as a unit after the tank is unbolted/unstrapped and lowered down for acces to its top. It might seem bothersome to not be able to replace only pump or sender (which would be cheaper) but, in the long run, why not reinstall the tank with full life expectancy for both sender and pump before you have to face a difficult and unpleasant tank removal the next time...which could be years, weeks, days in the future. In most cases, the job is one they they have neither facilities, help, tools, patience or confidence to perform; so for them its bite-the-bullet time. Get several bids, for sure.

Aug 20, 2014 | 2002 Pontiac Grand Prix

1 Answer

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

Gas gauge goes up to full and after a bit, down to total empty. What is causing it to do that?

Hello hawky 32: My name is Roger and I will help with your answer. The most likely culprit is the fuel sender unit in the fuel tank. This is replicable but requires the removal of the fuel tank in order to replace the unit. Also when the fuel pump module is replaced you will also have a new sender unit with the pump. You might want to investigate the cost of the sender for the fuel Gage verses the fuel pump module. The fuel pump unit you can buy at the parts store. The sender unit is most likely a dealer item only. Should you need further help please just ask. Please rate the answer. Thank You for using Fix Ya. Roger

May 31, 2011 | 2002 Pontiac Grand Prix

1 Answer

I have a 2004 pontiac montana. for about two years the fuel guage would fold over and read 125 degrees when the tank is full. it woulld stay there until tank was empty and the needle would drop to empty,...

It could be a bad fuel gauge in the dash unit, but....
Usually it's "The bad".
The fuel level sending wipe arm and windings on the fuel sender wear and send erratic readings.The only cure is a replacement fuel gauge sender.
The check engine light should not be related to the erratic fuel readings.
"The good".
If you have over 200,000kms or 120,000 miles on your van you need a new fuel pump anyway,so have a complete assembly put in which will have a new fuel sender on it.

May 21, 2017 | 2004 Pontiac Montana

1 Answer

02 super duty with 7.3 fuel gauge will give false readings.


Nov 17, 2009 | 2002 Ford F250 Super Duty SuperCab

2 Answers

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.

Sep 24, 2009 | 2000 Buick Century

2 Answers

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.

Aug 21, 2009 | 2002 Audi A6

2 Answers

How do replace heater core in 2002 Pontiac Gran Prix

i do believe you have to take the passengers side dash apart behind the glove compartment. go to autozone and get a manual or go to the library and check the chiltons manual. this is not an easy job. how bad is the leak? if its not bad these heater cores are made of all aluminum. i would buy a bottle of that radiator additive and see if that takes care of the problem first. it only cost about 5 bucks a bottle and it may permanantly fix your problem.

Dec 06, 2008 | 2002 Pontiac Grand Prix

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