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Another Fuel Gauge Problem

SilverGT

SilverGT

New member
I know this is quite common on the Grand Prix's and everyone says the Fuel sending unit. I have searched on a few forums but didn't seem to find someone with the exact same problem and was hoping someone on here might know.

So on to the problem, I have a 2001 Grand Prix GT. The fuel gauge will read correctly no matter how much fuel is in the tank but ONLY if the car is in park. It seems the gauge will sometimes move slightly when I push on the brakes or when I put in into drive. Once I start driving it will slowly hop back up to the top. Then when I park the car, and wait a few minutes it will go down to them correct level.

Is there a chance its an electrical problem, or is it still the sending unit?

Thanks
 


Hmm that is an interesting problem....It could be a sending unit. Contact Ed Morad and get on from him and throw it in. Seeing as how it is common might be a good thing to try.
 
I know this is quite common on the Grand Prix's and everyone says the Fuel sending unit.
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Really? I have two high mileage GTPs i've owned for years and I have yet to have this issue on this particular platform. I haven't heard of it on ClubGP from what I can recall either. Oh well....
 
Iron Indian said:
Really? I have two high mileage GTPs i've owned for years and I have yet to have this issue on this particular platform. I haven't heard of it on ClubGP from what I can recall either. Oh well....
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That was a fairly meaningless post. I have been able to find 5-6 threads on this problem on most GP forums. But I guess I should have just said the Fuel Sending Unit is usually the common failure point when it comes to the fuel gauge acting up.

I was just looking for more input.
 
I ended up re-grounding my sending unit a few years back and it fixed one of my problems until the circuit board decided to unsolder itself from one of the wires...

Pop your pump access cover off in the trunk, find the ground wire and tap it. Ground that new wire to the body on some fresh metal. I ended up using a looped crimp-on end and sliding it over one of the studs for the cover. Make sure you sand away some paint so you get good contact, though. Then, put the cover back on and, hopefully, you'll be good.

There's also a possibility you could have a short with the signal wire touching a ground somewhere. A multimeter and a lot of time will find that if it's an issue.
 


Thats a good idea, thanks Dan. I should have thought of that. :o

Ill try to reground it and see how it goes!
 
Where is the fuel sending unit grounded from the factory? And which wire(s) did you tap into?

Im trying to understand what you did. Did you get rid of the factory ground all together (cut the wire and add a crimp connector) or are you grounding it in two places?

Specifics would be awesome :th_biggrin2:
 
The black wire coming out of the plug is the ground ( I think there was only one) is what you're looking for. I just tapped into it with a wire tap, so it's grounded in two places.
 
Well when I looked, there are two plugs. One for the pump and one for the sending unit I assume. Three wires coming out of the one plug, and four out of the other. The one with 4 wires has two larger black wires on it.
 
Umm... I guess I don't remember that much detail. I would guess it doesn't matter which ground you tap? That may be a trial and error thing if it matters which one makes the difference.
 


SilverGT said:
That was a fairly meaningless post. I have been able to find 5-6 threads on this problem on most GP forums. But I guess I should have just said the Fuel Sending Unit is usually the common failure point when it comes to the fuel gauge acting up.

I was just looking for more input.
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I'm glad I could contribute.

I thought it was very funny that you said quote "I know this is quite common on the Grand Prix's and everyone says the Fuel sending unit". I was calling your bluff that all man. Don't get your panties in a wad. You know more about GPs than me I guess LOL, right.

Just making an honest point, I haven't really heard of this problem (much if any) on this car despite what you've said on your vast GP knowledge. The way you worded it you made it sound like its a very commmon, everyone has it type of problem. I've been around awhile and happen to own one GP with 143,000 miles and another with 165,000 miles. I'm not starting a fight, just giving you some facts I got, thats all.
 
Iron Indian said:
I'm glad I could contribute.

I thought it was very funny that you said quote "I know this is quite common on the Grand Prix's and everyone says the Fuel sending unit". I was calling your bluff that all man. Don't get your panties in a wad. You know more about GPs than me I guess LOL, right.

Just making an honest point, I haven't really heard of this problem (much if any) on this car despite what you've said on your vast GP knowledge. The way you worded it you made it sound like its a very commmon, everyone has it type of problem. I've been around awhile and happen to own one GP with 143,000 miles and another with 165,000 miles. I'm not starting a fight, just giving you some facts I got, thats all.
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Threads I found on this site alone:
http://www.grandprixforums.net/f81/fuel-gauge-problems-692.html
http://www.grandprixforums.net/f81/fuel-level-goes-crazy-9143.html
http://www.grandprixforums.net/f81/gas-gauge-problem-7368.html
http://www.grandprixforums.net/f81/why-does-my-gas-gauge-not-665.html
http://www.grandprixforums.net/f81/gas-gauge-works-then-doesnt-6840.html
http://www.grandprixforums.net/f17/00-gt-fuel-gauge-9259.html
http://www.grandprixforums.net/f71/fuel-gauge-4469.html
http://www.grandprixforums.net/f17/gas-gauge-stuckk-1127.html


Quote from other members about the fuel gauge/sending unit:
Sabrewings said:
Fuel level sender. Replace it. Yes it's a common problem. ;)
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^^He actually states this in a couple threads.

cherm45 said:
After using the search function, I have found the sending units are common to go bad.

Is the sending unit part of the complete fuel pump module?

TIA
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Personally, I think you should save the sarcasm. All I was trying to say was if you dont have anything helpful to say, why say anything? If I wanted to know who has and hasnt had the problem Id start a poll in a General Discussion and not post in a Tech Discussion, right? Knowing your cars have not had the problem doesnt help me any.

And no, I do not have vast GP knowledge because it is infact my winter beater.

Lets not continue a flame war?:th_laugh-lol3:
 
02 Grand Prix GT, 156,000+ miles - I have the same or similar problem with my fuel guage. Guage always reads FULL, except when parked on an incline (front higher than rear, like parked in driveway), and I think with the engine not running. I am strongly considering replacing the fuel sending unit, but what is this about the grouding issue? Can anyone else confirm if the grounding fix worked?
 
SilverGT said:
Threads I found on this site alone:
http://www.grandprixforums.net/f81/fuel-gauge-problems-692.html
http://www.grandprixforums.net/f81/fuel-level-goes-crazy-9143.html
http://www.grandprixforums.net/f81/gas-gauge-problem-7368.html
http://www.grandprixforums.net/f81/why-does-my-gas-gauge-not-665.html
http://www.grandprixforums.net/f81/gas-gauge-works-then-doesnt-6840.html
http://www.grandprixforums.net/f17/00-gt-fuel-gauge-9259.html
http://www.grandprixforums.net/f71/fuel-gauge-4469.html
http://www.grandprixforums.net/f17/gas-gauge-stuckk-1127.html


Quote from other members about the fuel gauge/sending unit:


^^He actually states this in a couple threads.



Personally, I think you should save the sarcasm. All I was trying to say was if you dont have anything helpful to say, why say anything? If I wanted to know who has and hasnt had the problem Id start a poll in a General Discussion and not post in a Tech Discussion, right? Knowing your cars have not had the problem doesnt help me any.

And no, I do not have vast GP knowledge because it is infact my winter beater.

Lets not continue a flame war?:th_laugh-lol3:
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I am assuming that this is fixed? Was it a bad ground or what did you find?
 
I have a 2001 grand prix se, I am having the same problem, my gas gauge is flucuating, not sure how much gas is in it, can any one tell me how to fix it.
 


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