Was running fine but doesnt want to start now

Your starter is only used while starting the engine. It will not make an engine die while it is running.

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Hi , what problem are you having ? There is no such relay on a 89 Cadillac ! Could you possibly mean a ASD relay - auto shut down relay ? That component is used on Chrysler products !

leaving the key on can overheat the the ignition system burning up the coil and control module

It's located under the right side instrument panel. There are 6 fuse and 10 relays - the fuel pump relay is the lower, middle one.

TO replace the fuel pump, remove the gas tank. When replacing the fuel pump also replace the strainer on the bottom of the pump and replace the fuel filter.

More often than not it is the fuel pump, especially with sitting for a couple years, hopefully empty if not try and get out as much of the old gas as possible when you replace the pump.

check to see if you have spark it could probably be that you have either a crank sensor issue or that the cap or rotor is bad

the fuel pump is inside the tank. did the distributor cap get wet when you were installing the thermostat? check to see if the wires are pluged into the distributor cap well. if you use a fuel pressure gage you will be able to determine if the fuel pump is working.

The fuel pump relay is located behind of the glove box. The fuel pump fuse is located in the same box (Relay Center). The fuel pump relay is either the 2nd or 3rd one down in the 2nd row. You may want to check your computer codes and make sure it is not your ECM or BCM as they can shut down ones fuel pump too.