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Old 09-10-2011, 09:26 PM   #1
jimmybeam
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Question Inaccurate Fuel Gauge

I have a 99 Grand Am and this is just one of many issues I'm having. The fuel tank gauge can be off by as much as a quarter of tank. It seems to change based on the incline of the vehicle.

I'm guessing (keep in mind that I am no car guy) that its a faulty float in the fuel pump. The meter works mostly, shows when more gas has been put in and when it is getting low but we've run out when it still showed an 8th of a tank.

I'm wondering based on the info I've given is it likely a bad float or something else? And from there how to go about resolving the issue. Again while I'm not a car guy per-say I can follow instructions, schematics and so forth.

Thanks in advance

Last edited by jimmybeam; 09-10-2011 at 09:33 PM. Reason: adding icon
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Old 09-11-2011, 06:54 AM   #2
MAC the KNIFE
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when you park on a hill, the fuel will of course flow to the lowest side of the tank.
when i park facing uphill, the gauge shows around 1/8 less than i really have.
and when facing downhill, i gain about 1/8 more than i have.

the easiest thing to do, whenever you fill up, just reset the trip computer. i really don't even need the fuel gauge b/c i know it won't go much further than 250 miles in my case.
or just accept that when you get to 1/4 of a tank left, you need to fill up!
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Old 09-11-2011, 11:47 PM   #3
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Try some fuel injector cleaner. The sender might be dirty.
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I could be wrong, but if you keep clearing the code with the OBDII scanner, it will keep coming back until the problem is solved.
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Old 09-13-2011, 01:25 AM   #4
jimmybeam
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I understand what you're saying Mactheknife but this has only happened recently , past 6-7 months.
When I mentioned running out of fuel while showing 1/8th, that was on level ground. However it can show half a tank to the warning light while driving and it does seems incline based at least in part.
Have used the fuel injector cleaner numerous times.
As you said, we basically use the trip meter and keep a journal in the car on gas bought vs mileage to make sure. It'd be nice if I could afford to keep it capped off all the time but that's not been possible lately.
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Old 09-13-2011, 10:43 AM   #5
MAC the KNIFE
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Quote:
Originally Posted by jimmybeam View Post
...As you said, we basically use the trip meter and keep a journal in the car on gas bought vs mileage to make sure. It'd be nice if I could afford to keep it capped off all the time but that's not been possible lately.
ouch! that's gotta suck trying to keep records of how much you think is in the tank, maybe get a new float assembly?

check rockauto.com or gmpartsdirect.com

and while your doing the work, might want to replace the fuel line filter too. (if it ain't been done before)
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2009 G8 gt
no more Big Gears, buh-bye coilovers... illusions of making this a racecar have passed. 12.78 @112.. not a bad grocery getter
-still LOUD AS FCK though

2006 GTO completely stock. rip at 39k.

99 GAGT 108k miles, Borla cat-back, CAI, 65mm TB, EGR delete, WOT-tech intakes, F-Body Brakes w/ Hawk HPS pads.
Suede headliner, heated seats, jvc HU, infinity speakers+amp+subs, LEDs
-probably less than 1000 miles on it in the last 3 years...
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