Question about 2005 Mazda RX-8

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When I fill up my gas tank the gauge registers at 5/8th of a tank. Occassionallt the gauge will register a full tank but while I'm driving it will go back to 5/8th.

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Your fuel sending unit is probably a little sticky...
I wouldnt worry about it... It's the bottom half of the tank of gas that matters , right?

Posted on Sep 28, 2010

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Posted on Jan 02, 2017

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1 Answer

2003 Honda crv fuel gauge doesn't register full when filling up tank also twice while driving the gauge goes to empty and fuel light comes on


Could be the sending unit in the tank or the gauge on the dash.
A mechanic would test each component by disconnecting the harness at the tank.

Sep 25, 2015 | Honda Cars & Trucks

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Fuel gage stuck at half full


Hi,
Check both the gas float and the fuel gauge. The terminal wire on the fuel float when grounded on the bare metal body of your car it will register on your gauge as "FULL ", if not the fuel gauge is malfunctioning and have to replace. When it register to your gauge as "FULL", the problem would be the gas float inside the fuel tank.
A technician could replace it for you.
Hope that helps you out.
Thanks for asking FixYa!

Aug 06, 2011 | 1997 Oldsmobile 88

1 Answer

Gas gauge was just under 1/4 tank, I filled up and the gauge did not register full. after driving for approx 30mins the gauge slowly moved to full.


There is a small float in your gas tank something like the one in your toilet tank(no I'm not kidding).Its position regulates an electrical current and based on its resistance gives a reading on your gas gauge. My best guess is this float got a bit stuck in the low position and it shock free after some time on the road.This is more common than you would think.Keep an eye on it and if it freezes in empty position or sometimes full position it will need to be replaced. Hope this helps,good luck.

Nov 04, 2010 | 2006 Nissan Frontier

1 Answer

Dual gas tanks, and one registers on the gauge and now the other registers empty. This just started to happen and for no apparent reason. Is there a simple fix or where should I start ?


If it reads empty, you probably have a short in the sender wiring to the tank, or the sender is bad. If you disconnect the electrical connector to the gauge near the tank, the gauge should then read full. You can then test the electrical resistance of the sender with the tank full and with it empty.

Aug 11, 2010 | 1992 Ford F250

1 Answer

Fuel gauge registers full when filled with gas....drive 20mi and then drops to zero...still gas in the tank


The sender unit in the tank is the most likely cause. To test the panel unit, remove the wire from the fuel tank unit and gound it. The panel gauge needle should move up full scale to hot. Remove the wire from the ground and the gauge should return to empty. If this test is ok, the tank unit needs to be replaced.

Apr 03, 2010 | 1989 Toyota Pickup SR5

2 Answers

The fuel gauge didn't go up to full right away after filling. It took almost 20 miles of driving but it finally registered full. Driving with the odometer showing so I can keep an eye on it to see if it...


How low was the tank, prior to filling it up...You most likely have a floating needle on the gauge...It's not uncommon for it to take a few minutes to register full, but 20 miles is a tad long...Could have been air in the system if you got really low on fuel...I'd do as you mentioned and keep an eye on it before I sought further help...tg

Mar 11, 2010 | 2007 Ford Escape Hybrid FWD

1 Answer

Gas gauge jumps from empty to what ever the tank is filled at .some time it shows half full etc then just drops to empty, then after a few minutes driving it goes back to a level.


I own two 1993 960s and on one the gas gauge sits on 0 until I thump (hard) the plastic lens in front of the gauage in the instrument panel. It is most certainly due to a cold solder or cracked solder joint. Can be a corroided contact.

Thump the gas gauge arrow like I do when it is registering 0. If it does not move then it is the sender in the tank that has a flat spot.

William White

Dec 30, 2009 | 1994 Volvo 960

1 Answer

Fuel gauge not give proper reading.. register full


Sorry to say,but the fuel sending unit is the problem,the fuel tank will have to be lowered out of the vehicle to replace the unit.If the fuel sending unit is not available by itself you will have to replace the whole fuel pump assembley.

Oct 14, 2009 | 1999 Buick Regal

1 Answer

Gas gauge not working right for 2000 silverado


the only thing that will cause this symptom is the fuel tank sending unit.

Jun 03, 2009 | 2000 Chevrolet Silverado

1 Answer

1986 f-250 duel tanks fuel gauges not registering right


id say either your sender unit is nackered or you have a bad earth to the body

Feb 05, 2009 | 1986 Ford F 250

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