Hard to start after car has been sitting over night. Sounds like pressure (popping) from engine area. I have replaced fuel filter. Could it be the fuel pump? If so how do I remove it? Do I have to drop the fuel tank?
Fuel Pump Removal and Replacement! on 1996 Cadillac Seville SLS
The noise you hear may be the injectors, could be fuel pump but recommend pressure and volume test, may have to leave gauge hooked up overnight and see if pressure bleeds off, the unit would be in the fuel tank.