I have put 21 gallons in with the red light on....red light goes out at @ 2.3- 2.5 gallons, but have never completely filled it from dry. this is with the early sender/aluminum tank which came with my car '4280' . have you tried the sender out of the tank[connected to gauge], comparing float level to the tank?check the float to see if it floats /check it off the arm ,also on the arm in a bucket of water.
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