possible that you filled up and the float in the tank got stuck and its reading full all the time... if thats the case you can try to bang on the bottom of the tank with a closed fist to try and knock it down... never done this before but seem like a common sense way fix it with out dropping the tank ( have heard of floats getting stuck though)
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97 Firebird Formula - 383LT1
15 Subaru WRX - 2.0L-turbo
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