i filled it up 3 days ago and its still reading full(yeah right an fc good on gas??).i put a few good miles on it with a couple races so i know somthins wrong. when i filled it up i figured id give it a couple extras pennies and now the guage is stuck. how can i fix this? someone please help. oh and if i need to get into the tank can i install my fd pump for my n/a turbo project or is that to much fuel at the moment.thanks.i dont have any other fuel mods on the car yet.

 

It's probably not the gauge but the sending unit in the fuel tank. Get another.

http://www.mazdatrix.com/c-pump.htm

You might also want to remove it and see if there is corrosion keeping the float from moving. Thirty minute job. Well, an hour maybe.