SOURCE: Possible heater core problems
that smell is coolant and yes you need to replace the heater core.
SOURCE: 2000 Buick Century gas gauge reads full all the time
You're either looking at a short in the wire that goes to the fuel sender, or a bad fuel sender. If it was just a broken wire, it would read empty instead. The fuel sender is a permanent part of the fuel pump, so that has to be replaced as a unit.
SOURCE: 1990 buick century
It sounds like the engine computer. Also check the resistance in the injectors and o-rings. O2 sensor and coolant temp sensor could give you a problem.
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