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How much trouble is it to replace gas gauge? - 1999 Chevrolet Blazer

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The sending unit is inside the fuel tank attached to the fuel delivery module...this is the most common fuel gauge problem I have seen on the S10 series of vehicles...you will need to drain and drop the fuel tank to gain access to the top of the tank...remove the fuel delivery module...and you may need to obtain the whole FDM...I do not know if the sending unit is available separately

Posted on Jan 03, 2011

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Gas gauge staying at empty when tank is full


Spencer, Check all fuses ,plugs and grounding at the tank.The sending unit module, inside the GM's gas tanks were notorious for going bad in this err, when you changed it did you use a quality part? Also the fuel pump sending unit plug/wire harnesses were known issues, so much that replacement pumps would often come with replacement plug to splice into existing harness. Check the attached links,instruction and guides on how to trouble shoot fuel gauge/sending unit, Good luck
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."
General Motors Fuel Gauge Troubleshooting American Autowire
GM Defective Gas Gauge Leaves Owners Guessing
Fuel Gauge Tech How To Properly Diagnose Faulty Fuel Pump Sending Unit
GM Fuel Pump Level Sensor Diagnosis Testing

Aug 27, 2016 | 2000 Oldsmobile Alero

1 Answer

The service engine soon light came on and at the same time the gas gauge stopped working. Why?


SEL is probably on because you don't have gas cap on correctly, or gasket on cap is torn. Gauge not working is separate issue I expect. Could be fuse, bad gauge, bad sending unit inside tank, or broken wire.

Jun 12, 2015 | 2005 Ford Explorer

2 Answers

I have a 1990 gmc sierra and the gas gauge will only show a quarter tank when it is actually full. What needs replacing and is it difficult


Have to drop fuel tank & replace the sending unit

I would not do that

It is too old for that trouble & expense

Just fill it once a week & keep track of mileage

Mar 13, 2013 | GMC Sierra Cars & Trucks

1 Answer

Dash gas gauge stops showing proper gas level once it hits half a tank. Then gauge will fluctuate between empty (light will come on), full and anywhere in between but seems fine from full tank to half


If the trouble with the gauge started after you worked on it then you likely damaged or created a restriction to the movement of the sending unit. You will have to remove the tank and double-check your work.

Mar 01, 2013 | 2000 Buick LeSabre

1 Answer

What's the easiest way to change the spark plugs and my gas gauge bounces around alot it goes from full to empty. my 4wheel drive wont engage either


jack it up, use jack stands. take off the front wheels, and go in through the wheel well to get to the spark plugs. Gas gauges on every blazer is freaking crazy. mine acts up when it`s at a 1/4 tank. Park up hill it shows more, park down hill, it shows empty.

To much trouble to replace, unless you have the time and money to replce the sending unit.

Feb 16, 2011 | 2002 Chevrolet Blazer

1 Answer

Signifique code p-1627


Trouble code P1627 means: PCM A/D Conversion Malfunction

This is a fuel sending unit code and it directly related to you goofy gas gauge. This is a common problem in 2nd Gen Isuzus. The fuel sending unit needs to be replaced. Most places will tell you that you must replace the entire fuel pump assembly module but you can buy just the sending unit.

Other faults to refer this problem and other c
odes: P0141, P0300, P0404, P1404, P1627, with this synthoms:
hesitates sometimes on takeoff, gas gauge gives random readings(sometimes will read empty, or full, or somewhere in between), Fuel light flashes sometimes.

Hope helps.

Mar 16, 2010 | 2000 Isuzu Rodeo

1 Answer

Fuel gauge does not work


take an ohm meter and see if 8 ohms register to the fuel tank sender
if not replace it

Mar 06, 2010 | 2000 Chevrolet S-10

1 Answer

My 2005 Dodge Grand Caravan fuel gauge does not move. I have gas in the tank, but the gauge shows the tank is empty (in fact, the dial is ~ 1/4" below "E").


the level sending unit in the tank is attached to the fuel pump module it is a varible resistor it moves as fuel level changes this sending unit can be replaced but if your going to the trouble of replacing it you just as well replace the fuel pump it comes together.

Feb 28, 2010 | 2005 Dodge Grand Caravan

1 Answer

Gas gauge indicater stopped working


On these model of cars they have trouble with the sending unit in the gas tank on the side of the fuel pump. You can normally buy a new sensor with arm at an aftermarket parts store. However, the gas tnak has to come out to replace the sending unit. hope this helps you. good luck

Feb 20, 2010 | 2000 Chevrolet Malibu

3 Answers

Gas gage allways says full 1999 gmc serria


sender unit is stuck. this is inside the tank and is like a float. when its full the float is at the top, and vice versa. you might be able to access it through a cover plate in the boot but otherwise its a tank-off job. refer to a haynes manual for replacement techniques.

Aug 21, 2009 | 2000 GMC New Sierra 1500

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