98 cadillac sedan deville delegance, has fire has fuel, turns over wont start...what should i check next...thinking it an electrical problem....

starter would be next place to check --cellunoid specifically

check wiring to starter, have starter checked

Security system is active, look in your owners manual to deactivate

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

you need to figure out if your missing spark at the plgs,or check fuel pressure at fuel rail,you'll need at least 55psi of fuel pressure,but if you have had no luck spraying the throttle body,your probably missing spark

do the heater core coolant supply hoses both get hot at the firewall in the engine compartment? if yes then you have a defective temperature control blend door actuater motor.

check your fuse box then your coil pack

I assume all lamps are tested to be ok.
1) Check fuse A11 in trunk (10A) is ok,
2) Check turn flash enable relay 'F' in trunk is operated when vehicle Ign on,
3) Check +12V is present on Lt Blu wire on turn flasher module (LHS steering column) when Ign on,
4) if no fault found during above checks, operation of the turn switch should be checked

Find more information about Cadillac Deville Concours Wiring Diagram and Electrical System Schematics here. (v8mr2.com)

Have you tried the fuel pump relay? It may be the safety switch needs resetting.

I'd start by tracing the fuel supply and return lines from the gas tank to the engine compartment. Make sure that they are free of kinks or other damage.

Next, check the fuse box and make sure there is power to the fuel pump. Trace the electrical connections leaving the fuel tank and make sure they weren't torn or otherwise damaged by the tire tread.

Hope this helps and good luck!