Question about 1991 Pontiac Bonneville

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My fuel guage stays at 3/4 tank no matter how much gas I have. What do I do?

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  • Pontiac Master
  • 6,826 Answers

Find the wire on the top of the tank and ground it with a test light,with the key on,if it goes to empty,then unplug it from the tank,the fuel gauge should go to ful,if it does these two things,then it is in the sending unit in the fuel tank.If it does not move,then replace the fuel gauge in the dash,If this was at all helpful,please rate,thank you.

Posted on Jul 29, 2010

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6ya6ya
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Posted on Jan 02, 2017

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d_hubbs
  • 270 Answers

SOURCE: fuel guage stuck at 3/4 tank on my 2004 Chevy

Hi: It Sounds like you Either Have a bad Connection on Your Gauge or the Sending Unit which is in Yout Gas Tank.Your Fuel Pump and Sending Unit Are Located In Gas Tank.Check and Make Sure your Connections are Good and Clean 1st. But it Really Sounds like your Sending unit has Gone Bad.To Replace Sending Unit You'll Have to Drop The Fuel Tank,Empty As Much Fuel as you Can Either Drive till its empty. Holding your Tank Up is 2- Metal Straps with Threaded Bolts and Nuts, Spray with WD-40 And Let It Set awhile Cause Normaly the Are Dirty. Then Take Eiter A Deep Well Socket if it will reach the Nuts,Or Use A Wrench -Remove BOTH NUTS And also at the Filler Tube You'll Probally have a2-3 Screws you'll need to Take Out. Your Tank Should Come on Down.NOTE: Don't PULL the tank out Until you take your Wire Connects Off Remember Which ones Went where. Then Slide Tank out Away From Vehicle, On The Top Of Tank where you remove the wires where thers a Metal Retaining Ring, You'll need to Spray with wd-40 and Remove that Ring,Buy taking a Screw Driver and small Hammer and Tap it out Going Counter Clockwise. After its Off you will be able to Remove the Complete Fuel Pump Assembly. All you'll Need is to Remove Sending Unit.Since Fuel Pump Was Working Right.See if your Auto parts Store has only the Sending unit.if not try Dealership, Hopefully You Won't Have to Replace the Complete Unit. Hopefully this will help you. Please Let Me Know By Voting for me on the Quality of Solutions i've Given you,And Leave a Testamony if You Will. Thanks From The WYOCWBOY

Posted on Jun 02, 2010

  • 14585 Answers

SOURCE: gas guage does not work. replaced fuel module in

Three things to check
Pull the plug that goes to the sending unit there will be 3 or 4 wires in it, use a volt /ohm meter set it to dc volts, check and if you have power going to two of the wires, this will be the pump and sending unit power. then set to the lowest ohms setting and check the other wire/wires to see if they are grounded to the frame, you will have to find a good ground on the frame. if you find a bad wire you will trace it back to the short and repair it. If these all check out good then you have to go to the instrument panel. I have had very few guages go bad, usually the most of ar the whole instrument panel goes out instead of one guage. You will have to pull the instrument panel out. Remove the bezel in front of the panel, usually two screws above the panel and the rest pops out. then four screws to remove the panel. Alot/ most of the time I find that the plug is coming out of the panel. I suggest you remove it all the way then plug it back in, do both plugs. If the plugs are mounted on the frame then all you need to do is push the panel back in place. First make sure the plugs are not loose in the frame. If they are resecure them. then recheck the fuel guage. if it is not working you will have to take the panel apart, about a half dozen screws. then you can check the guage itself for continuity. if it is bad replace it. If you need any other help with this let me know.
Randy

Posted on Nov 10, 2010

  • 53 Answers

SOURCE: i have a c240 2003

go to autozone or other car parts place and tell them every thing you told me theyll get your part

Posted on Nov 15, 2010

csmock132
  • 4669 Answers

SOURCE: I have 1990 Mazda Protege

This is the way it is suppose to be. Mazda doesn't want you to run out of fuel. So they want you to think it is out of fuel when it has 2 gal left. Plus it is hard on fuel pumps to run low. The pump are cooled by the fuel. This way when you think you are out and need to fill it up you aren't completely out . The only way you can change this is to pull out the sending unit and bend the float arm down a little bit.

Posted on Feb 14, 2011

  • 594 Answers

SOURCE: fuel guage stuck on "E"

more then likely sending unit whent bad part of fuel pump assembly in tank

Posted on Jun 26, 2011

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1 Answer

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Dash Fuel Guage goes to approximately 1/3 of a tank and stays .Eventually run out of fuel as no warning we are out of gas.will replaceing this guage solve the problem.


To be sure you will need to replace both the gauge in the dash and the other gauge part - the sending unit. The sending unit is in the gas tank. I would replace the dash gauge and see if that fixes it. Seems like a waste but it is way cheaper than the alternative. Once you have the dash gauge replaced it will either work or not. This will allow you to investigate replacing the tank sending unit to be sure.
This I think you will find is the least expensive way to go about fixing the problem.

Best of it

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Fuel guage stuck on "E"


more then likely sending unit whent bad part of fuel pump assembly in tank

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Your sending unit is going bad, it is located inside the fuel tank. The fuel tank will have to come out from the car, not something you want to try at home. sorry.

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the gas guage: is usualy a simple flot on a rod in the tank (like a toilet tank has) instead of opening or closing a valve it operates a "potentiometer" veriable position sensor (kind of like a dimmer switch).
if the float gets stuck the guage will stay in that position, the guage gets the signal via the wire harnes, so check the electric circit.
A trick I used on one of my jeeps (I removed the guages ) I filled the tank, reset the trip odometer to zero, put a jeerycan and a couple gallons of gas in the jeep, then drove normaly a week or so till I ran out of gas. wrote down the mileage on the trip odometer. gerrycan gas got me to the gas station.
divided the mileage by half. I fill up the tank all the way the reset the trip odometer to zero, when I reach the half mileage of the tank I fill up again and repeat

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The gas guage still reads full when there is only a half tank


U are going to have to replace the fuel guage sending unit in the fuel tank, there is no other part that will cause this problem

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