If you don't have your manual then try following your fuel lines under the car and it should be connected to them. It may be concealed a little by a plate or covering but if you feel around for it you'll find it.
RepairPal Certified shops can diagnose and repair your 1992 Mercedes-Benz 600SEL. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.