1998 Pontiac Grand Prix GAS DROPPING ON CONVERTERS

If gas is "dripping" on convertor, there is a leak.

If convertor was red hot, it is probably completely clogged and would prevent car from starting.

You might want to look for a new mechanic.

Yeah, that's a little bit fishy-sounding. Maybe you misunderstood him somewhat, or maybe he mis-spoke.

If your catalytic converter becomes clogged, you'll notice a definite performance problem. You'll have to give it a lot of gas to even move slowly, and it will sound like it's running really bad. When they are clogged, they will get pretty hot all on their own. No need for the introduction of fuel to become hot.

If you have a leaking fuel line, that would be a completely separate problem. You should be able to test for that fairly easily. Your car has an electric fuel pump. When the car is cool (for safety's sake), turn the ignition switch to 'on' (but don't engage the starter). Listen for the fuel pump to pressure up. This will establish operating fuel pressure in the fuel line. Leave the switch on. Look underneath the car. Smell for gasoline, see if you can see any drips. The catalytic converter is near the center of the car. If you can, get your hand in there, feel around the top of the converter for moisture.

A leaking fuel line would be a fairly rare occurrence. A plugged converter, more possible. Both at the same time? *Maybe*