Sundance leaks gas when it's running

On this i think you will find you have a pluged cadilac converter. Try taking the bolts out of the pipe going to the convert and move it out of the way so not to restrict the exhaust. You may need to wire it up to the bottom of the car so it wont drag. It is going to be loud but take it for a run if it accelerates like it should you will need to replac the converter. If it doesnt then check for a code on the TPS switch. { Throttle Posions Sencor} Good luck and hope this helps.

disconnect power supply to fuel pump, then start engine when engine stalls fuel pressure released

The old fuel could have clogged the fuel filter, pump, lines and/or injectors. I'm not sure about the code on your model but I believe it refers to the circuit that supplies power to keep your radio presets and clock set when the ignition is turned off.

Hm. auto seat belt not moving points to a burnt out motor or a fuse is blown.

Have you had the starting and charging systems tested by Sears or Walmart?

How does it start?

To the rear of the gas tank under the car.

replace the thermostat it is probably stuck open flush the cooling system and replace with new antifreeze

i need to know is it a 4 or 6 cilinder??

Check all your vacum lines and make sure that your plug wires are properly secured this seems like a minor problem

Please fix the fuel leak before anything else!! The fuel pressure is definitely being lowered by the leak and the leak itself is a serious fire hazard. If the fuel pressure is too low, the engine will starve and shut off.

my reliant (89) idles very high when you start it, then settles
down, but while driving it starts to chug very bad. I have new plugs, wires, distribitor cap and rotary button. How do I fix it??