Question about 1999 Pontiac Grand Am GT

1 Answer

1999 Pontiac Grand Am Fuel Problems

The gas guage has been inaccurate for quite a while. Below 1/2 a tank it will sometimes flash the E light and the needle will drop, then the needle rises to Full or 1/2 full and the light goes off.
NOW, the car will not take gas more than 2 gallons at a time.
I crawled under the car and knocked on the gas tank, it's not full.
Is there some kind of cutoff at the fuel filler neck that is limiting the amount of gas that I can put in because the car "thinks" that the gas tank is full?
Is it part of the fuel pump/float/sensor unit?

Thanks for any help you can give.

Posted by on

1 Answer

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

The gas guage has a sending unit in the tank attached to the pump, there is a small circuit board on it that has smal"fingers" that send the signal to the guage.These get worn off and thus sends a false reading to the gas guage in the dash. The gas tank must be removed and a new unit put in to solve the problem. I had to do this repair to mine. As for the gas issue, just try pulling the nozzle back out of the filler neck when putting gas in, sometimes the overflow tube gets plugged up and won't allow the air to escape as the gas goes in the tank, making the gas pump think the car is full, pulling the nozzle will allow the air to escape. Hope this helps.

Posted on Mar 11, 2009

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Inaccurate fuel guage 99 pontiac guage


factory defect. replace unit inside tank.

Jan 27, 2013 | 1999 Pontiac Montana

1 Answer

Fuel guage always shows empty


It sounds as if the fuel tank sending unit is faulty. This is a small float connected to a variable resistor on the fuel pump/sending unit assembly. Unfortunately this assembly is fairly expensive (over $300) and the fuel tank may need to be removed to replace it.

Aug 23, 2012 | 1999 Isuzu Rodeo

1 Answer

Just filled the gas tank in my 2006 f-350 turbo diesel super duty (6.0), started the truck and the guage showed a full tank. Drove down the road about 1/10 of a mile and the guage dropped to dead empty...


A loose connection on the sending unit could cause the problem but also moisture in the tank in cold weather could also be a factor in which i would add fuel line antifreeze to a full tank of fuel..........Hope this helps you out.

Dec 17, 2010 | Ford F-350 Super Duty Cars & Trucks

1 Answer

2004 Pontiac Grand Prix, check gas cap


Could possible be the Fuel Tank Pressure Sensor. It is located on top of the fuel pump. The fuel pump access is located in the trunk, under the carpet, behind the back seat. The AutoZone part number is SU 1390.

Apr 02, 2010 | 2004 Pontiac Grand Prix

2 Answers

I have fuel pick up problems on a 1995 bonneville....gas guage says 1 quarter tank of fuel


I believe that the fuel pump and gas gauge are all one. They are located in the fuel tank. When they start going bad they sometimes start reading the amount of fuel left in tank incorrectly.

Nov 27, 2009 | 1995 Pontiac Bonneville

1 Answer

Grand prix gas gauge not working


should be a grey wire going to the top of fuel tank connects to fuel guage / when the guage in the tank reads grounded it shows full , no ground it shows empty. if you ground that grey wire and the guage jumps to full then faulty guage if nothing maybe bad ground on the tank itself. the guages are a reostat like a tyco race car gun the more it moves the more it grounds .. good luck

Nov 19, 2009 | 2000 Pontiac Grand Prix

1 Answer

Pontiac grand am stalling


believe me the motor in your car has spark plugs. unless the engine is a deisel which i highly doubt...you definitely have a fuel problem, or more likely a gas guage problem.where at a 1/4 tank it actually is running on fumes... have it checked at a full service garage..good luck..

Nov 15, 2009 | 2004 Pontiac Grand Am

1 Answer

Fuel guage works when it wants


Most likely its the sensor in the fuel tank.

Apr 12, 2009 | 1999 Pontiac Grand Am GT

1 Answer

1999 Pontiac Grand Am Floating Gas Guage


 you have a bad connection or faulty tank gauge unit

Mar 18, 2009 | 1999 Pontiac Grand Am GT

1 Answer

Fuel gauge inaccurate 2002 Pontiac Bonnyville


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

Feb 15, 2009 | 2002 Pontiac Grand Prix

Not finding what you are looking for?
1999 Pontiac Grand Am GT Logo

701 people viewed this question

Ask a Question

Usually answered in minutes!

Top Pontiac Experts

yadayada
yadayada

Level 3 Expert

61168 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

21949 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

6812 Answers

Are you a Pontiac Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...