Question about 1972 Oldsmobile 98

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Fuel gauge not working new sending unit.no power to sending unit

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  • Master
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You will have to test the wire that attatches to the sender unit!
It may have a break some where in it along its length all the way back to the fuel guage!

Posted on Jul 20, 2009

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: fuel gauge fluctuates on 1995 chevrolet tahoe

if you replaced the tank and all i assume you didnt change the fuel pump. if you dint then all thats wrong is that the float on the fuel pump is gas logged and will move more than if you had put in a new pump thus the fluctuation in the guage.

Posted on Jan 28, 2009

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

  • 4 Answers

SOURCE: Fuel Gauge Problems

Hey there. Well, I had the same problem on a 1999 Isuzu Rodeo. I thought I'd take the easy out and just replace a fuel sending unit. Don't waste your time. Swap out the entire fuel pump. Go to your favorite autoparts store (Autozone) and ask for them to price the fuel pump. There will be options, get the part number for the cheap one ($80 Airtex, I got mine from a place in Miami). Look up the part number on ebay and buy it for about $80 complete. Spend the money and get a new fuel filter from parts store as well as a Haynes repair manual for the truck. Follow the instructions for fuel pump removal in section 4. You should have a degree of confidence on auto repair or take is straight to a reputable shop. You do need to do some very important things (relieve fuel pressure, drop the fuel tank with the truck on high ramps or jack stands, etc.). This is NOT for the novice. Otherwise, expect the task to take 4 to 6 hours if you don't have a lift. A shop should charge 1 1/2 hours labor and cost of the pump - you need to ask yourself what your time is worth.

Good Luck
Donnie Torok

Posted on May 01, 2009

citroenchris
  • 600 Answers

SOURCE: 2000 buick century custom. fuel gauge fluctuates

The sender unit has a fine resistance wire with a slider to read the level, the slider or wires are worn and making intermittent contact, the low fuel light is a seperate switch so it will still work.access to the sender is usually under the rear seat cushon, under the soundproofing and a cover, have a look and describe what you have .

Posted on Nov 01, 2009

  • 540 Answers

SOURCE: I have 97 S10 4.3L my fuel gauge doesnt work.

just put a sending unit in it I have done tons of them...

Posted on Dec 07, 2009

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1 Answer

Why won't the fuel gauge work?


The power wire from the sending unit runs to the gauge. Since it is showing 3/4 all the time. It is a break in the wire or really high resistance. I would check resistance of the ground wire first. If it is good(less than 5.0 ohms), I would replace the power wire from the pump to the gauge. I assume the gauge goes to empty with the key off. If not the gauge is bad.

Oct 05, 2016 | 1997 Chevrolet Blazer

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Fuel gauge not working, fuse?


Check fuse, if fuse ok, then you need to check the fuel gauge at the tank. most probably there's a loose connector or the gauge is faulty

Jan 10, 2015 | Cars & Trucks

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Fuel gauge problems


The sending unit grounds the gauge. So if the sending unit is working and the gauge has power, its probably the gauge.

Jul 23, 2013 | Nissan Cars & Trucks

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Put in new fuel pump and sending unit. but my gas gauge doesnt always work. sometimes is does and sometimes it doesnt


if it worked for a short period of time after doing the pump/sending unit the check the connections going to the pump/sending unit they would have been moved around doing the pump

Aug 11, 2012 | Cars & Trucks

1 Answer

2001 chevy 1500 5.3l 4x4 fuel guage not working. changed sending unit no change. grounded gauge in dash went to full not guage. not getting power to sending unit fuses/ wiring good


You won't get power at the sending unit. The sending unit provides a variable ground to the dash unit. Where did you ground the dash unit? If you disconnect the sending unit at the tank and ground the fuel gauge circuit there the gauge should go to full. If if doesn't the problem is between that connector and the place you cheched it before. If it does the problem is with the sender. Occasionally new parts are found to be defective.

Apr 17, 2011 | 1999 Chevrolet Silverado 1500

1 Answer

I need to locate the fuse for my gas gauge in my 99 malibu


There is no fuse specific to the fuel gauge. The Instrument panel has two fuses that supply power to everything it has on it. The fuel gauge signal is received from the body control module which sends out a signal voltage to the fuel level sending unit. Depending on where the float in the tank in determines how much resistance the sending unit has. the body control module interprets the voltage value into a fuel level and sends a signal to the gauge.

If the gauge is not working the most common cause is the sending unit in the tank.

Nov 11, 2010 | 1999 Chevrolet Malibu

1 Answer

Fuel gauge dont work i put a new fuel pump in it and it still do'nt work 1997 blazer


Was the wire harness replaced from the fuel sending unit to the frame, it's a good practice to replace the wire harness when the sending unit is replaced. The wires are know to break and cause sending unit issues from weak fuel pressure to faulty gas gauges.
The other possibility would be a faulty connection to the stepper motor in the gauge it self or just a faulty stepper motor that would need to be replaced. You can do a search on Ebay for stepper motors for your fuel gauge which runs for around $15.00 which is much better then $400.00 for a new cluster if it is and bad fuel gauge stepper motor.
Thank you for using fixya and good luck.

Apr 18, 2010 | 1997 Chevrolet Blazer

1 Answer

New fuel pump and sending unit. now gas gauge


if the gas gauge worked before i would just double check the connections to the fuel pump and make sure they are tight.

Apr 03, 2010 | 1990 Ford Tempo

2 Answers

Fuel gauge stuck on full


pos lead is used to measure ground...that means that the power goes through the fuel level sending unit and the ground lowers the power out from the unit....I would replace the fuel level sending unit.

Jul 28, 2009 | 2000 Ford Mustang

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