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Fuel gauge gives inaccurate readings

Fuel gauge bounces around. Won't give accurate reading

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6ya6ya
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Posted on Jan 02, 2017

emissionwiz
  • 74945 Answers

SOURCE: fuel gauge inaccurate 2002 Pontiac Bonnyville

this problem is caused by the sending unit inside the fuel tank, very common problem.

Posted on Feb 15, 2009

  • 29 Answers

SOURCE: my 2001 Pontiac Aztek's fuel gauge works until

it is one of two things the fuel gauge in the tank is bad or the gauge in the dash is bad...I would check with the dealer to see if they have seen that problem before...they maybe a recall for that problem...

Posted on Nov 18, 2009

  • 108 Answers

SOURCE: Speed ometer in the dash gives inaccurate reading

The problem here is your "Stepper Motors" are failing in the Instrument Cluster. If your Vehicle has "LOW MILEAGE" it may still be covered under factory warranty. Check with your Dealer first! If not covered under warranty, most reputable Speedometer Repair facilities can service it for you. All "Stepper Motors" in the Instrument Cluster should be replaced at the same time as the OEM versions are prone to ultimate failure.Typically, there are 5 or 6 dependent upon whether or not you have a Tachometer. They are: Speedometer, Temperature, Oil Pressure, Fuel Gauge, Volt Meter and Tachometer. The replacement part must have X25 168 where the X indicates an improved model.

Posted on Dec 12, 2009

  • 2 Answers

SOURCE: Fuel gauge seems to stick -- irratic readings

I've researched this problem thoroughly as all of my gauges on my '04 Bonneville GXP are producing erratic readings. The only two solutions are to replace the entire cluster which can cost in excess of $700 or replace the six "stepper" motors behind the cluster. Replacing them can only be done by deslodering the old ones and soldering in replacement ones.

Posted on Jan 14, 2010

  • 538 Answers

SOURCE: the gas gauge gices inaccuate readings, usully it

Generally the sending unit is the culprit, to change it you have to drop the gas tank. I'm not sure on a 99 but, most of the newer cars and trucks the fuel pump and sending unit is all one piece. They can be spendy. You can check with car-parts.com for a used unit. Another option is to use your trip meter ( if you have one ) for a gas gauge. Simply zero the trip meter when you fill the tank and when you get 200 miles or so, maybe more, on a tank fill it again and zero the trip meter again.

Posted on Mar 26, 2010

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Temperature and depth reading is bouncing around all over. Is that something I can fix???


Popular Mechanics - Jan 1961 - Page 139 - Google Books Result

https://books.google.com/books?id=XNsDAAAAMBAJ
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Fuel gauge doesn't work


mine did the same thing 2 years ago. i assume it is probably the fuel gauge sending unit in the fuel tank so i priced a new one. as i remember it was about 350.00 for just the part. my computer reads in gallons and is still accurate as to telling me how much fuel i have used so when i use 10 to 12 gallons out of the tank i fill it again. so far i have had no problem doing it like that. just don't run out of fuel because that is really bad for fuel pumps. mine has a 14 gallon tank so i make sure that i never go below 12 gallons used. i usually try to fill at 10 gallons used

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Its very simple. If the gauge is showing half full then fill the tank and see how much fuel it takes. If the amount you add is approximately 50 percent of the fuel tank capacity then you know the fuel gauge is accurate . In that case the computer is giving an inaccurate reading and should be ignored. All you need is an accurate fuel gauge - it does not matter a row of beans what the computer says if the fuel gauge is reading correctly.

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Check the ground for the sender. If it is a metal tank, make sure the grounding strap is in good condition. If it is a plastic tank, check that both wires are in good shape and make good connection with the sender unit.

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It sounds like the sending unit has a dead spot on it causing it to read inaccurately. The tank would have to be dropped and the sending unit replaced. Check out this page and illustration to better understand what's going on. "How a fuel gauge works"

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Possibly a bad ground wire at the sender on the tank,

Check for that first before tearing into the dash to replace the guage.

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1 Answer

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The fuel level sensor is bad. The tank will have to be taken down to replace the level sensor. There is little fingers on the resistor that wear down and loose contact causing the gage to read incorrectly.

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1 Answer

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i have a 2004 buick lasabre gauges are not working can anyone give me an answer of how to fix this

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