My 2005 Grand Am Pontiac has three fuse boxes where is the gas gauge fuse located

It is called 'HVAC Blower (Climate Control)'. and is fuse 13.

Pontiac Grand Am (1999-2005) fuses and relays

https://fuse-box.info > pontiac > pontiac-grand-am-199...

Here you will find fuse box diagrams of Pontiac Grand Am 1999, 2000, 2001, 2002, 2003, 2004 and 2005, get information about the location of the fuse panels ...

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Question edited for clarity 'year MAKE model'.

I see Larry has answered, but here are the full diagrams.

Fuse Box Diagram Pontiac Grand Prix (1997-2003)

https://fuse-box.info > pontiac > pontiac-grand-prix-19...
Fuse box location ... It is located in the glovebox, behind the cover on the right. The location of the fuses in the passenger compartment: Pontiac Grand Prix ...

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  Fuse Box Diagram Pontiac

  https://fuse-box.info > Home > Pontiac
  Fuse box diagrams (location and assignment of the electrical fuses and relays) ... fuses and relays) for Pontiac Grand Prix (1997, 1998, 1999, 2000, 2001, ...

Pontiac Grand Prix mk6 (Sixth Generation; 1998) - fuse ...

https://www.autogenius.info > pontiac-grand-prix-mk6-...
Feb 26, 2017 - The underhood fuse block is located on the passenger's side of the vehicle in the engine compartment. Pontiac Grand Prix - fuse box - engine ...

Pontiac Grand Prix 1998 Fuse Box/Block Circuit Breaker ...

https://www.carfusebox.com > pontiac-grand-prix-1998...
Jan 3, 2021 - Pontiac Grand Prix 1998 Fuse Box/Block Circuit Breaker Diagram ; Circuit Breaker ; HEADLMP, Headlamps ; PWR SEAT, Power seat, Power lumbar ; PWR WDO ...

Which one ? There are three , one under the hood in engine compartment an there is one at each end of the instrument panel . Open both front doors pull off the end panels off dash panel . Fuse box's inside >

This MAY help.

Interior Fuse Box Location 1999 2005 Pontiac Grand Am 2000 Pontiac Grand...

On this website (link below) you find fuse box diagram and description for Pontiac Grand Prix 2005

Pontiac Grand Prix mk7 Seventh Generation 2005 fuse box diagram Auto Genius

If all voltages checked ok,then most probably its faulty instrument cluster board on which gauges are connected.Yes if cluster circuit board looks ok,then also it can be faulty.Somewhere there is minute short or burn on board then such prolem arises.
Also check the fuse box.One under hood and other under dash.Inspect each and every fuse and see if all are fine or not.
---------------For more troubleshooting on these cluster gauges i suggest you to refer the list of help links mentioned below.Its step by step instructions will help you to confirm the exact cause of problem in these conditions:---------
Click the link below:------

2004 Toyota Tundra: Oil Gauge and Temp Gauge Not Working?

http://howtobyme.blogspot.in/2012/05/2004-toyota-tundra-oil-gauge-and-temp.html

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2005 Lexus SC430: Fuel Door, Dome light and Fuel Gauge Fuse Location?

http://howtobyme.blogspot.in/2012/05/2005-lexus-sc430-fuel-door-will-not.html
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Toyota 4Runner: Temperature Gauge Sensor

http://technoanswers.blogspot.in/2012/04/toyota-4runner-temperature-gauge-sensor.html
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Temperature gauge sits over half way mark?

http://schematicsdiagram.blogspot.in/2012/04/temperature-gauge-sits-over-half-way.html

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Heater blows intermittently and temp gauge goes erratic?

http://technoanswers.blogspot.com/2012/01/heater-blows-intermittently-and-temp.html

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Temperature gauge does not move and no heat when heater is ON?

http://technoanswers.blogspot.com/2012/01/temperature-gauge-does-not-move-and-no.html

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2003 Pontiac Grand Prix: Erratic Fuel Gauge?

http://technoanswers.blogspot.in/2012/06/2003-pontiac-grand-prix-erratic-fuel.html

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Temperature gauge keeps fluctuating up and down close to red?

http://technoanswers.blogspot.com/2012/01/temperature-gauge-keeps-fluctuating-up.html

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Temperature gauge on the dash quit working on Pontiac Grand Prix?

http://technoanswers.blogspot.com/2012/01/temperature-gauge-on-dash-quit-working.html

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Fuel gauge jumps from empty to full?

http://schematicsdiagram.blogspot.com/2011/12/fuel-gauge-jumps-from-empty-to-full.html

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Gas gauge stuck on empty on 2002 Mercedes Benz 240c?

http://repairhelpcenter.blogspot.in/2012/02/gas-gauge-stuck-on-empty-on-2002.html
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• Oldsmobile Temperature Gauge Lamp Switch?

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Fuel gauge drops to Empty?

http://technoanswers.blogspot.com/2012/01/fuel-gauge-drops-to-empty.html

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Dodge neon gauges not working?

http://technoanswers.blogspot.in/2012/02/dodge-neon-gauges-not-working.html

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Temperature gauge went up?

http://schematicsdiagram.blogspot.com/2011/12/temperature-gauge-went-up.html

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Temperature gauge stays At cold on jaguar?

http://technoanswers.blogspot.in/2012/02/temperature-gauge-stays-at-cold-on.html
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How to replace Instrument panel and dashboard on Toyota car?

http://repairhelpcenter.blogspot.in/2012/02/how-to-replace-instrument-panel-and.html

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How to remove instrument panel on Chevrolet car?

http://technoanswers.blogspot.in/2012/02/how-to-remove-instrument-panel-on.html

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How to remove control panel on Buick regal?

http://howtobyme.blogspot.in/2012/02/how-to-remove-control-panel-on-buick.html
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These details will help.Thanks.

Yes the gauges are on a fuse marked gauges.
I think that fuse is in the interior box, could be in the glove compartment, under the instrument panel, or on either end of the dash where the door closes. Your owner's manual should help you there.

The fuel gauge is not fused separately. If the gauge is not working you likely have a defective fuel level sending unit inside the fuel tank.

If there is not a map molded into the cover, it will be in the owners manual

The fuse would be at the main area( Fuse box). Or you may have to replace the whole lighter if it burned out. Hopes This Helps (Please take the time to rate me)